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1. Abiotic stresses and endophyte effects

Author:
Belesky, David P.; West, Charles P.
Source:
Tall fescue for the twenty-first century / H.A. Fribourg, D.B. Hannaway, and C.P. West, editors pp. -
Subject:
endophytes; plant growth; plant development; vigor; symbiosis; acid soils; soil nutrients; nutrient deficiencies; Festuca arundinacea subsp. arundinacea; drought; water stress; stress tolerance; Lolium
Handle:
10113/41742

2. Grazing, burning, and drought influences on rangeland ecosystem sustainability

Author:
Emmerich, W.E.; Heitschmidt, R.K.
Source:
Sustaining the global farm : selected papers from the 10th International Soil Conservation Orgainization Meeting / edited by: Diane E. Stott, Rabi H. Mohter, and Gary S. Steinhardt pp. -
Subject:
rangelands; rangeland soils; agricultural runoff; soil erosion; grazing; drought; prescribed burning; losses from soil; soil nutrients; nitrogen; phosphorus; potassium; ecosystems; soil fertility; range management
Handle:
10113/47652

3. Impacts of drought and/or heat stress on physiological, developmental, growth, and yield processes of crop plants

Author:
Prasad, P.V.V.; Staggenborg, S.A.; Ristic, Z.
Source:
Response of crops to limited water : understanding and modeling water stress effects on plant growth processes / L.R. Ahuja ... [et al.], editors pp. -
Subject:
plant growth; plant stress; plant development; drought; water stress; heat stress; crop yield; crops
Handle:
10113/37613

4. Influence of Management on Soil Organic Carbon Dynamics in Northern Mixed-Grass Rangeland

Author:
Schuman, G.E.; Ingram, L.J.; Stahl, P.D.; Derner, J.D.; Vance, G.F.; Morgan, J.A.
Source:
Soil carbon sequestration and the greenhouse effect / editor, Rattan Lal & Ronald F. Follett, co-editors pp. -
Subject:
grasses; C4 plants; soil organic carbon; soil-plant-atmosphere interactions; rangelands; plant communities; botanical composition; rangeland soils; aboveground biomass; drought; livestock; carbon sequestration; soil nutrient dynamics; soil respiration; grazing intensity; C3 plants; belowground biomass; prairies; climatic factors; Wyoming
Handle:
10113/44339

5. Lint yield advantages of no-till and poultry litter-based cotton/rye cropping system in a Southern Piedmont soil: a five-year data set

Author:
Endale, D.M.; Schomberg, H.H.; Cabrera, M.L.; Steiner, J.L.; Radcliffe, D.E.; Vencill, W.K.; Lohr, L.
Source:
Proceedings of the Southern Conservation Tillage Conference for Sustainable Agriculture 1978 to 2002 : 25 years pp. -
Subject:
Gossypium hirsutum; yields; poultry manure; ammonium nitrate; mineral fertilizers; organic fertilizers; sandy loam soils; piedmont soils; fertilizer application; no-tillage; conventional tillage; drought; dry environmental conditions; soil water; cotton; Georgia
Abstract:
... Cotton [Gossipium hirsutum (L.)] is a dominant crop in the Southeast. It is largely grown using conventional tillage and fertilizers. Georgia and bordering states produce about 42% of the poultry in the United States, but only a small percentage of the litter is utilized as fertilizer. We measured and compared cotton yield from conventional tillage (CT) and no-till (NT) plots fertilized either wit ...
Handle:
10113/21291

6. Rodent outbreaks in North America

Author:
Witmer, Gary; Proulx, Gilbert
Source:
Rodent outbreaks : ecology and impacts / editors, Grant R. Singleton ... [et al.] pp. -
Subject:
urban areas; drought; vertebrate pests; food availability; wildlife food habits; population density; predation; case studies; land use; climatic factors; rodents; crops; North America
Handle:
10113/47381

7. Spatial corn yield during drought in the SE coastal plain

Author:
Sadler, E.J.; Bauer, P.J.; Busscher, W.J.
Source:
Proceedings of Site-Specific Management for Agricultural Systems : Second International Conference, March 27-30, 1994 Thunderbird Hotel, 2201 East 78th St., Minneapolis, MN : conducted by the Department of Soil Science and Minnesota Extension Service, University of Minnesota / editors P.C. Robert, R.H. Rust, and W.E. Larson pp. -
Subject:
Zea mays; corn; grain yield; spatial variation; fields; drought; water stress; coastal plains; soil water content; canopy; temperature; plant development; South Carolina
Handle:
10113/37499

8. Toward a sustainable agriculture

Author:
Hanson, Jon D.; Hendrickson, John R.
Source:
Farming with grass: Achieving sustainable mixed agricultural landscapes / edited by Alan J. Franzluebbers pp. -
Subject:
sustainable agriculture; industrialization; animal production; markets; fossil fuels; energy; drought; economic impact; globalization
Handle:
10113/44776

9. Drought and the means of overcoming its evil effects in the Volga Region of European Russia

Author:
Tulaikov, N.
Source:
Agronomy journal 1923 v.15 no.1 pp. 6-15
ISSN:
0002-1962
Subject:
crop losses; drought; economic analysis; environmental factors; USSR
DOI:
10.2134/agronj1923.00021962001500010002x

10. Studies of irrigation methods for sugar beets in northern Colorado

Author:
Brewbaker, H.E.
Source:
Agronomy journal 1934 v.26 no.3 pp. 222-231
ISSN:
0002-1962
Subject:
weight; crop quality; beet pulp; sucrose; drought; Beta vulgaris subsp. vulgaris; crop yield; rain; length; irrigation scheduling; roots; shoots; Colorado
Abstract:
... The results of 2 years' studies of different methods of irrigation at Fort Collins, Colorado, are presented. The experiment sought information on time for first irrigation in the spring, frequency of application, and time for last application in the fall. Under conditions of unusually deficient rainfall as existed during the 2 years in which this experiment was conducted, it seems probable that th ...
DOI:
10.2134/agronj1934.00021962002600030007x

11. Effect of over-grazing on Kentucky bluegrass under conditions of extreme drouth

Author:
Wilkins, F.S.
Source:
Agronomy journal 1935 v.27 no.2 pp. 159
ISSN:
0002-1962
Subject:
Poa pratensis; overgrazing; drought; Iowa
DOI:
10.2134/agronj1935.00021962002700020012x

12. Evaluation of drought hazard

Author:
Barger, G.L.; Thom, H.C.S.
Source:
Agronomy journal 1949 v.41 no.11 pp. 519-526
ISSN:
0002-1962
Subject:
drought; rain; probabilistic models; meteorological data; Iowa
Abstract:
... The incomplete T-curve has been fitted to frequency distributions of n-week rainfall totals. The parameters in this equation were estimated by the method of maximum likelihood. This curve, when checked against the frequency histograms by the chi-square test, showed a good fit in most cases. Only when the frequencies exhibited a definite bi-modal tendency were the chi-square values greater than wou ...
DOI:
10.2134/agronj1949.00021962004100110004x

13. A method for characterizing drought intensity in Iowa

Author:
Barger, G.L.; Thom, H.C.S.
Source:
Agronomy journal 1949 v.41 no.1 pp. 13-19
ISSN:
0002-1962
Subject:
drought; Zea mays; crop yield; rain; methodology; Iowa
Abstract:
... Rainfall records and corn yield figures for six Iowa counties, each representative of a specific association of soil areas have been analyzed to determine a method for characterizing drought in each county. The criterion of drought intensity developed is based on the association of certain minimum required total rainfall amounts with time intervals of varying duration, i.e., the amount of rainfall ...
DOI:
10.2134/agronj1949.00021962004100010003x

14. Weak neck of sorghum

Author:
Hansing, E.D.; Melchers, L.E.; Bates, J.C.
Source:
Agronomy journal 1950 v.42 no.9 pp. 437-441
ISSN:
0002-1962
Subject:
cultivars; plant diseases and disorders; etiology; carbohydrate content; carbohydrates; drought; shade; defoliation; Sorghum (Poaceae)
Abstract:
... A study was made on the symptomatology and etiology of weak neck of sorghum. This is a physiologic or nonparasitic disease characterized by gradual disintegration of the tissues of the peduncles, which often break at or near their bases, and by poorly developed grain with absence of normal luster. Weak neck was induced by subjecting Colby plants to one or more drouth-stress periods, by artificial ...
DOI:
10.2134/agronj1950.00021962004200090005x

15. The effect of drought on the seeds of Delwiche Early Scotch field pea

Author:
Hagedorn, D.J.
Source:
Agronomy journal 1950 v.42 no.8 pp. 412-413
ISSN:
0002-1962
Subject:
Pisum sativum; cultivars; seeds; drought; seed germination; Wisconsin
DOI:
10.2134/agronj1950.00021962004200080011x

16. Detasseling Responses in Corn

Author:
Clarence O. Grogan
Source:
Agronomy journal 1956 v.48 no.6 pp. 247-249
ISSN:
0002-1962
Subject:
corn; crop yield; drought; soil fertility; soil nutrients
Abstract:
... SynopsisDetasseling increased corn yields under conditions of drought, low soil fertility, and above-optimum plant populations. Data indicate that detasseling should be beneficial at close spacings with strong competition for soil nutrients. ...
DOI:
10.2134/agronj1956.00021962004800060001x

17. Effects of Location, Hybrid, Fertilizer, and Rate of Planting on the Oil and Protein Contents of Corn Grain

Author:
C. F. Genter; J. F. Eheart; W. N. Linkous
Source:
Agronomy journal 1956 v.48 no.2 pp. 63-67
ISSN:
0002-1962
Subject:
agronomy; corn; drought; fertilizers; hybrids; lipid content; oils; planting; protein content; Virginia
Abstract:
... SynopsisWith 7 corn hybrids at various locations in Virginia, hybrids were more important than growing conditions as a source of variation in oil content; the reverse was true for the effect on protein content. With 3 levels of N, P, and K, and at 10,000 and 16,000 plants per acre, the location, planting rate, and N level all significantly affected protein content. Protein content was significantl ...
DOI:
10.2134/agronj1956.00021962004800020005x

18. Results from Subsoiling and Deep Fertilization of Corn for 2 Years

Author:
W. K. Robertson; J. G. A. Fiskell; C. E. Hutton; L. G. Thompson; R. W. Lipscomb; H. W. Lundy
Source:
Soil Science Society of America journal 1957 v.21 no.3 pp. 340-346
ISSN:
0361-5995
Subject:
Zea mays; clay; corn; crop yield; drought; fertilizers; hardpans; leaves; minor elements; plows; rain; residual effects; root systems; roots; sand; sandy loam soils; soil profiles; subsoil; subsoiling; Florida
Abstract:
... Data on six soil types in North and West Florida for 2 years were used to evaluate subsoiling and deep placement of fertilizer. Lime, fertilizer, fertilizer plus lime, and fertilizer plus lime plus minor elements placed in the subsoil were compared with subsoiling alone and surface fertilization at low and high rates. Corn yields, root distribution and the chemical composition of ear leaves were u ...
DOI:
10.2136/sssaj1957.03615995002100030023x

19. Growth Variations in a Red Pine Plantation Influenced by a Deep-Lying Fine Soil Layer

Author:
Donald P. White; Robert S. Wood
Source:
Soil Science Society of America journal 1958 v.22 no.2 pp. 174-177
ISSN:
0361-5995
Subject:
drought; environmental factors; land use; potassium; roots; sand; soil profiles; soil properties; soil water; trees
Abstract:
... Investigation of site factors responsible for a highly significant growth difference between two contiguous parts of a red pine plantation showed that important effects were related to a deep-lying fine soil layer. The growth difference between two adjacent parts of this 25-year-old stand established on an old field (Hinckley coarse sand) has been attributed to differences in land use. Investigati ...
DOI:
10.2136/sssaj1958.03615995002200020023x

20. Utilizing Drought-Days in Evaluating Irrigation and Fertility Response Studies

Author:
W. L. Parks; J. L. Knetsch
Source:
Soil Science Society of America journal 1960 v.24 no.4 pp. 289-293
ISSN:
0361-5995
Subject:
crop yield; drought; equations; fertilizers; income; irrigation; nitrogen; production functions; rain
Abstract:
... It is expected that a crop grown during a year of insufficient moisture will economically require less fertilizer than a similar crop grown with an ample supply of moisture. Likewise, crop response to supplemental irrigation would be greater during a year of low rainfall than during a year of adequate rainfall. The moisture deficiencies may be expressed as “drought-days” for any specific soil-crop ...
DOI:
10.2136/sssaj1960.03615995002400040023x

21. Some aspects of the physiology and behaviour of dinothrombium (acari)

Author:
CLOUDSLEY-THOMPSON, J.L.
Source:
Entomologia experimentalis et applicata 1962 v.5 no.1 pp. 69-73
ISSN:
0013-8703
Subject:
Acari; adults; burrows; color; drought; geotaxis; mimicry (behavior); mites; phototaxis; rain; sand; transpiration
Abstract:
... Adult giant velvet mites appear in the desert after rain. They are diurnal in habit, but become crepuscular in dry conditions. Their high rate of water-loss by transpiration suggests that they are not particularly well adapted to drought. They are positively phototactic and negatively geotactic in dry sand, but dig burrows where it is damp. Their scarlet coloration has an aposematic function. ...
DOI:
10.1111/j.1570-7458.1962.tb00566.x

22. Studies on Water Requirement of Horticultural Crops. I. Influence of Drought at Different Growth Stages of Potato on the Tuber's Yield

Author:
B. R. de Lis; I. Ponce; R. Tizio
Source:
Agronomy journal 1964 v.56 no.4 pp. 377-381
ISSN:
0002-1962
Subject:
Tuber (Tuberaceae); developmental stages; drought; horticultural crops; irrigation; potatoes; tubers; water requirement
Abstract:
... SynopsisRestrictions in irrigation on potato growing applied at different periods of their vegetative cycle produced a decrease of the tuber's yield for all the treatments compared to the check, with the exception of those planted without pre-seeding irrigation. Statistical results show that drought treatment from stolonization to the beginning of tuberization gave significant differences as relat ...
DOI:
10.2134/agronj1964.00021962005600040003x

23. An Area of Pristine Vegetation in Craters of the Moon National Monument, Idaho

Author:
E. W. Tisdale; M. Hironaka; M. A. Fosberg
Source:
Ecology 1965 v.46 no.3 pp. 349-352
ISSN:
0012-9658
Subject:
Achnatherum thurberianum; Artemisia tridentata; Bromus tectorum; Festuca idahoensis; Pseudoroegneria spicata; basalt; drought; ecosystems; lava; loess; plant communities; soil; vegetation; Idaho
Abstract:
... A 180—acre kipuka near Carey, Idaho, surrounded by rough lava areas has apparently never been grazed. The entire kipuka is covered by the sagebrush—grass types of which three communities have been recognized and described: the Artemisia tripartita/Festuca idahoensis, the A. tridentata/Festuca idahoensis/Agropyron spicatum, and the A. longiloba/Festuca idahoensis/Stipa thurberiana communities. Ches ...
DOI:
10.2307/1936343

24. Development of Inventory Models to Determine Feed Reserves for Beef‐Cattle Production under Unstable Climatic Conditions

Author:
M. Afzal; J. H. McCoy; F. Orazem
Source:
American journal of agricultural economics 1965 v.47 no.4 pp. 948-962
ISSN:
0002-9092
Subject:
agricultural economics; beef cattle; carrying capacity; climatic factors; drought; income; inventories; models; pastures; probability distribution; ranchers; stocking rate
Abstract:
... An investigation is made of the use of inventory models for determining the optimum quantity of feed reserves under drought conditions. The costs and revenues associated with beef‐cattle production and the carrying of reserve feed supplies are combined with a probability distribution of drought occurrence in an expected‐net‐revenue function. Variation in the quantity of feed stored permits the max ...
DOI:
10.2307/1236336

25. Drought‐Associated Mortality of Range Grasses in South Texas

Author:
Albert D. Chamrad; Thadis W. Box
Source:
Ecology 1965 v.46 no.6 pp. 780-785
ISSN:
0012-9658
Subject:
Andropogon; Bouteloua dactyloides; Elionurus; Panicum; Paspalum plicatulum; Schizachyrium scoparium; clay; clones; drought; grasses; indigenous species; mortality; sand; sandy loam soils; summer; wildlife; Texas
Abstract:
... The effects of a 2—year drought on native grasses in South Texas were investigated on the Welder Wildlife Foundation Research Area during the summer of 1963. The percentage mortality on Victoria clay, Nueces fine sand, and Miguel find sandy loan was determined for seacoast bluestem (Andropogon scoparius Michx. var. littoralis (Nash) Hitch.), silver bluestem (Andropogon saccharoides Swartz var. lon ...
DOI:
10.2307/1934009

26. Effects of Repeated Drought Periods on Photosynthesis and Survival of Cereal Seedlings

Author:
Glenn W. Todd; Daniel L. Webster
Source:
Agronomy journal 1965 v.57 no.4 pp. 399-404
ISSN:
0002-1962
Subject:
agronomy; drought; drought tolerance; photosynthesis; turgor; wheat
Abstract:
... SynopsisThere were no significant differences in photosynthetic rate among wheat varieties differing in drought hardiness although slightly higher rates were obtained at lower turgor for nearly all cereal varieties after they had been subjected to a single drought period. Photosynthetic rates paralleled moisture stress during successive drought periods. A method of screening for relative drought h ...
DOI:
10.2134/agronj1965.00021962005700040028x

27. Vagility of P32‐Labeled Isopods in Grassland

Author:
Oscar H. Paris
Source:
Ecology 1965 v.46 no.5 pp. 635-648
ISSN:
0012-9658
Subject:
Armadillidium vulgare; Porcellio scaber; animals; dropouts; drought; equations; food availability; forage; foraging; grasslands; nocturnal activity; summer; wet season; winter; California
Abstract:
... The nocturnal activity of Armadillidium vulgare in California grassland suggests that this cryptozoan may be very vagile, but earlier attempts to study its lateral movements failed because of its secretive habits. In the present study, assimilated radiophosphorus was used to label isopods and make the recovery of hidden individuals possible. In each of four experiments, cohorts of about 1,000 radi ...
DOI:
10.2307/1935003

28. Vegation Changes During a 30‐Year Period in Grassland Communities Near Hays, Kansas

Author:
F. W. Albertson; G. W. Tomanek
Source:
Ecology 1965 v.46 no.5 pp. 714-720
ISSN:
0012-9658
Subject:
Andropogon gerardii; Bouteloua curtipendula; Bouteloua dactyloides; Bouteloua gracilis; Schizachyrium scoparium; drought; grasses; grasslands; plant communities; Kansas
Abstract:
... Three plant communities near Hays, Kansas, showed considerable change in the composition of their dominant vegetation over the 30—year period from 1932 to 1961. The short grass community was dominated by Buchloe dactyloides and Bouteloua gracilis in 1932 and dominated only by Bouteloua gracilis in 1961. The little bluestem community was dominated by Andropogon scoparius during favorable years but ...
DOI:
10.2307/1935011

29. Comparative Drought Resistance of Five Conifers and Foliage Moisture Content as a Viability Index

Author:
Richard P. Pharis
Source:
Ecology 1966 v.47 no.2 pp. 211-221
ISSN:
0012-9658
Subject:
viability; soil water content; pumice; Abies; drought tolerance; sowing; Pinus lambertiana; drought; Pinus ponderosa; soaking; soil water; planting; water content; death; Pseudotsuga menziesii; conifers; sand; leaves; forests
Abstract:
... Whole plant lethal points of foliage moisture content (FMC) for ponderosa pine, sugar pine, Douglas—fir, grand fir, and incense—cedar were established from foliage tissue of various ages. Exact lethal level depended upon the age of the tissue, but there was a general plateau between the ages 6 and 13 months for sugar pine and Douglas—fir and 3 and 13 months for incense—cedar. Whole plant relative ...
DOI:
10.2307/1933767

30. Effects of Seed Origin on Drought Resistance of Douglas‐Fir (Pseudotsuga Menziesii) (Mirb.) Franco

Author:
William K. Ferrell; E. Steve Woodard
Source:
Ecology 1966 v.47 no.3 pp. 499-503
ISSN:
0012-9658
Subject:
Pseudotsuga menziesii; drought; drought tolerance; greenhouses; seedlings; topographic slope; Cascade Mountain region; Oregon
Abstract:
... Douglas—fir seedlings from a number of seed origins were subjected to drought conditions in the greenhouse and laboratory. Interior mountain seedlings showed significantly greater drought resistance than seedlings from origins west of the Cascade Mountains. Differences were also found within each of these groupings. In the Corvallis, Oregon, area seedlings produced from seed on a south slope had m ...
DOI:
10.2307/1932994

31. Effects of Simulated Drought by Polyethylene Glycol Solutions on Corn (Zea mays L.) Germination and Seedling Development

Author:
M. T. Parmar; R. P. Moore
Source:
Agronomy journal 1966 v.58 no.4 pp. 391-392
ISSN:
0002-1962
Subject:
Zea mays; aqueous solutions; corn; drought; embryo (plant); germination; growth performance; osmotic pressure; polyethylene glycol; prediction; seedling growth; seedlings; solutes; tetrazolium
Abstract:
... Drought conditions were simulated in the laboratory by using aqueous solutions having osmotic pressures from 1 to 10 atmospheres. “Carbowax” polyethylene glycol 6000 was used as the solute. Germination percentages and subsequent seedling growth of two lots of corn, differing in embryo soundness, progressively decreased with increased osmotic pressures. The effects of the high osmotic pressures wer ...
DOI:
10.2134/agronj1966.00021962005800040007x

32. Influence of Some Environmental and Management Factors on the Persistence of Ladino Clover in Association with Orchardgrass

Author:
Carl T. Blake; D. S. Chamblee; W. W. Woodhouse
Source:
Agronomy journal 1966 v.58 no.5 pp. 487-489
ISSN:
0002-1962
Subject:
Dactylis glomerata; agronomy; defoliation; drought; forage; irrigation; management systems; rain; shade tolerance; viruses; water supply
Abstract:
... The objectives of this study were to determine the influence of different cutting managements, irrigation, simulated drought, fungicide-insecticide applications, and partial shade on the persistence of ladino clover grown in association with orchardgrass. Diseases and/or insects were dominant factors influencing persistence and yield of ladino clover. During the second and third years, clover prod ...
DOI:
10.2134/agronj1966.00021962005800050009x

33. Problems of adaptation of pastoral businesses in the arid zone

Author:
Keith O. Campbell
Source:
Australian journal of agricultural and resource economics 1966 v.10 no.1 pp. 14-26
ISSN:
1364-985X
Subject:
arid zones; business enterprises; climatic factors; drought; dry environmental conditions; planning; Australia
Abstract:
... With emphasis upon Central Australia, an assessment is made of the economic problems of pastoral firms in meeting the climatic conditions of the arid zone. Analysis ranges over the responsibility for conservation and drought planning, the inadequacy of a purely physical approach to conservation, the difficulties of station organization and management in the arid zone, the array of possible manager ...
DOI:
10.1111/j.1467-8489.1966.tb00603.x

34. Soil‐Vegetation Relationships within the Ponderosa Pine Type in the Central Oregon Pumice Region

Author:
C. T. Dyrness; C. T. Youngberg
Source:
Ecology 1966 v.47 no.1 pp. 122-138
ISSN:
0012-9658
Subject:
Abies concolor; Ceanothus velutinus; Festuca idahoensis; Pinus ponderosa; Purshia tridentata; Regosols; buried soils; calcium; carbon nitrogen ratio; drought; exchangeable calcium; mixing; organic matter; plant communities; pumice; roots; sand; Cascade Mountain region; Oregon
Abstract:
... Six plant communities occurring within the ponderosa pine (Pinus ponderosa) and white fir (Abies concolor) zones were identified east of the Cascade Mountains in south—central Oregon. These units, listed in order of increasing effective moisture and increasing elevation, are as follows: (1) Pinus ponderosa/Purshia tridentata, (2) Pinus ponderosa/Purshia tridentat/Festuca idahoensis, (3) Pinus pond ...
DOI:
10.2307/1935750

35. Water Budget of a Forest Damaged by Ionizing Radiation

Author:
W. A. Reiners; G. M. Woodwell
Source:
Ecology 1966 v.47 no.2 pp. 303-306
ISSN:
0012-9658
Subject:
evapotranspiration; chronic exposure; ionizing radiation; herbaceous plants; drought; growing season; leaves; forests
Abstract:
... Cumulative evapotranspiration, measured by soil—moisture changs over a growing season, was only slightly greater in intact zones of a gamma—irradiated oak—pine forest than in severely damaged zones. In the central part of this forest where exposures exceeded 160 R/day and only scattered herbaceous plants survived, cumulative evapotranspiration was about 85% that of the intact forest. Rates of evap ...
DOI:
10.2307/1933777

36. Drought and the multiplier1

Author:
J.H. Duloy; A.D. Woodland
Source:
Australian journal of agricultural and resource economics 1967 v.11 no.1 pp. 82-86
ISSN:
1364-985X
Subject:
drought; econometrics; farms; imports
Abstract:
... The effects of a 20 per cent across‐the‐board drought‐year reduction in farm output upon G.N.P., imports and the balance of payments are estimated via an econometric mode of the Australian economy. The effects do not appear to be overly large and taper off rapidly in succeeding years. ...
DOI:
10.1111/j.1467-8489.1967.tb00029.x

37. Factors Affecting the Distribution of Shrub Live Oak (Quercus Turbinella Greene)

Author:
R. E. Saunier; R. F. Wagle
Source:
Ecology 1967 v.48 no.1 pp. 35-41
ISSN:
0012-9658
Subject:
Quercus turbinella; chaparral; clay soils; diorite; drought; grasslands; quartz; reproduction; rooting; sediments; seedling production; shrubs; soil water; Arizona
Abstract:
... The disjunct distribution, reproduction, and rooting habits of Quercus turbinella in the Arizona chaparral were studied on quartz diorite, sedimentary, and volcanic substrata. The oak was less dense on the sediments and volcanics that on quartz diorite. Lower densities on the bedded sediments resulted from restricted root penetration which prevented access to deep soil moisture; on the volcanic su ...
DOI:
10.2307/1933415

38. Influence of Drought and Grasing on Mortality of Five West Texas Grasses

Author:
Thadis W. Box
Source:
Ecology 1967 v.48 no.4 pp. 654-656
ISSN:
0012-9658
Subject:
Andropogon; Bouteloua curtipendula; Eragrostis trichodes; Panicum virgatum; Sorghastrum nutans; clones; correlation; drought; grasses; grazing intensity; mortality; pastures; sand; Texas
Abstract:
... Significantly more plants of silver bluestem (Andropogon saccharoides Swartz.), sideoats grama (Bouteloua curtipendula (Michx.) Torr.), sand lovegrass (Eragrostis trichodes (Nutt.) Nash), switchgrass (Panicum virgatum L.), and Indiangrass (Sorghastrum nutans (L.) Nash) died on Brownfield fine sand, eroded phase, grazed pastures, than on adjacent ungrazed areas, during a recent 4—year drought, alth ...
DOI:
10.2307/1936510

39. Methods of Measuring Drought Tolerance in Corn

Author:
T. V. Williams; R. S. Snell; J. F. Ellis
Source:
Crop science 1967 v.7 no.3 pp. 179-182
ISSN:
0011-183X
Subject:
corn; drought; drought tolerance; germination; greenhouses; mannitol; osmotic pressure; rain; temperature
Abstract:
... Three methods for measuring drought tolerance in corn are presented. They include: exposing corn seedlings to a 52 C temperature for 6 hours followed by recovery counts; germinating corn seed in mannitol solution at 15-atm osmotic pressure and selecting genotypes showing the highest percent germination; and subjecting corn seedlings to a 14-day permanent wilting period in a greenhouse followed by ...
DOI:
10.2135/cropsci1967.0011183X000700030003x

40. Phenological Variation within Seven Transplanted Grassland Community Fractions from Texas and New Mexico

Author:
Calvin McMillan
Source:
Ecology 1967 v.48 no.5 pp. 807-813
ISSN:
0012-9658
Subject:
Panicum virgatum; Schizachyrium scoparium; Sorghastrum nutans; altitude; clones; drought; flowering; grasslands; habitats; rivers; sea level; summer; tetraploidy; New Mexico; Texas
Abstract:
... Community fractions, consisting of population samples of Andropogon scoparius Michx., A. gerardii Vitman, Panicum virgatum L., and Sorghastrum nutans (L.) Nash, were transplanted to Austin, Texas, from six sites in Texas and one site in New Mexico. A behavioral gradient among the transplanted community fractions was correlated with the length of the growing period (over 300 to less than 200 days) ...
DOI:
10.2307/1933738

41. Studies of Water Requirements of Horticultural Crops: II. Influence of Drought at Different Growth Stages of Onion

Author:
B. R. de Lis; I. Ponce; J. B. Cavagnaro; R. M. Tizio
Source:
Agronomy journal 1967 v.59 no.6 pp. 573-576
ISSN:
0002-1962
Subject:
Allium cepa; agronomy; bulbs; drought; horticulture; onions; seedlings
Abstract:
... Two years of field experiments with onion crops (Allium cepa, L.) show that this plant is differentially sensitive to drought in each stage of its vegetative cycle. Drought at the seedling stage increases the rate of foliar emergence, produces a greater number of leaves, accelerates bulb formation by 15 days, and increases the final weight as compared with the check (no significant difference). Wh ...
DOI:
10.2134/agronj1967.00021962005900060025x

42. Test for Drought Resistance in Pearl Millet (Pennisetum typhoideum)

Author:
Mamdouh A. Fanous
Source:
Agronomy journal 1967 v.59 no.4 pp. 337-341
ISSN:
0002-1962
Subject:
Pennisetum glaucum; chlorophyll; drought; drought tolerance; early development; heat treatment; mannitol; millets; osmotic pressure; seed germination; soil water; Georgia; India
Abstract:
... In tests for drought resistance in pearl millet, three methods were used: (1) growth in pots under different soll moisture tension regimes, (2) germination of seeds and growth of seedllngs in mannitol solutions of different osmotic pressures, and (3) stability of extracted chlorophyll under heat treatment. The pearl millets studied represented a considerable range of ecological adaptation varying ...
DOI:
10.2134/agronj1967.00021962005900040016x

43. Total Net Productivity and Turnover on an Energy Basis For Tallgrass Prairie

Author:
C. L. Kucera; Roger C. Dahlman; Melvin R. Koelling
Source:
Ecology 1967 v.48 no.4 pp. 536-541
ISSN:
0012-9658
Subject:
aboveground biomass; burning; drought; dry matter accumulation; ecosystems; energy; energy content; growing season; leaves; long term effects; rain; root systems; roots; solar energy
Abstract:
... The energy equivalent of total net productivity including foliage and roots on unburned prairie in 1962 was 4.351 X 10⁶ cal/m², representing 992 g of biomass. The root system provided slightly over 50% of the annual increment. For 1963 the total growth was 1,133 g/m². The average energy for these years was equivalent to 1.21% of the incident radiation received during the growing season for the 400 ...
DOI:
10.2307/1936496

44. Water Use, Stomatal Action, and Transpiration Unaffected by Atrazine

Author:
J. E. Pallas; A. R. Bertrand
Source:
Agronomy journal 1967 v.59 no.2 pp. 139-142
ISSN:
0002-1962
Subject:
atrazine; corn; drought; irrigation; open pollination; sandy loam soils; transpiration; water use efficiency
Abstract:
... The effects of soil-applied atrazine (2-chloro-4-ethylamino-6-isopropylamino-s-triazine) on water use, stomatal activity, and yield of a hybrid and an open-pollinated variety of corn were studied in the field. The studies were conducted in Cecil sandy loam soil using two moisture regimes, irrigated and simulated drought (plastic-covered soil). Irrigated corn had significantly higher yields, lower ...
DOI:
10.2134/agronj1967.00021962005900020004x

45. Carbowax 6000, Mannitol, and Sodium Chloride for Simulating Drought Conditions in Germination Studies of Corn (Zea mays L.) of Strong and Weak Vigor

Author:
M. T. Parmar; R. P. Moore
Source:
Agronomy journal 1968 v.60 no.2 pp. 192-195
ISSN:
0002-1962
Subject:
Zea mays; agronomy; dent corn; drought; energy; germination; mannitol; osmotic pressure; polyethylene glycol; regression analysis; root growth; seedling growth; seedlings; sodium chloride; tetrazolium; vigor
Abstract:
... The investigations concerned the influences of simulated drought conditions on germination and early nonphotosynthetic stages of seedling growth of two lots of dent corn differing in energy. Carbowax polyethylene glycol 6000, (C6M), mannitol, and NaC1 were used osmotic substrates to prepare aqueous solutions having 0 to 10 atmospheres of osmotic pressure (O.P.), corresponding to ditfferent drought ...
DOI:
10.2134/agronj1968.00021962006000020015x

46. Drought Conditions for Burning Raw Humus on Clear-Cut Jack Pine Sites in Central Ontario

Author:
Z. Chrosciewicz
Source:
Forestry chronicle 1968 v.44 no.5 pp. 30-31
ISSN:
0015-7546
Subject:
Pinus banksiana; burning; clearcutting; drought; humus; prediction; seedbeds; Ontario
Abstract:
... Raw-humus materials were burned to improve seedbeds on clear-cut jack pine sites in central Ontario. The depths of residual raw humus after burning showed consistent patterns of variation both with the depths of original raw humus before burning (direct relationships) and with the drought conditions under which the materials were burned (inverse relationships). On this basis, humus-depth-reduction ...
DOI:
10.5558/tfc44030-5

47. Ecology of Two Populations of an Aquatic Isopod, Lirceus Fontinalis Raf

Author:
C. E. Styron
Source:
Ecology 1968 v.49 no.4 pp. 629-636
ISSN:
0012-9658
Subject:
Lirceus; anaerobic conditions; drought; ecotypes; gamma radiation; predators; races; respiratory rate; rivers; streams; temperature; Georgia
Abstract:
... Two populations of Lirceus fontinalis Rafinesque in DeKalb County, Georgia are isolated in separate river drainages and evolving in response to different environmental stresses. Drought and high temperatures seem the main ecological factors limiting the population on Mount Arabia. These factors are of little moment to the population in Lullwater Creek where biotic factors are of primary ecological ...
DOI:
10.2307/1935528

48. Establishment of Tall Fescue and White Clover: Effects of Seeding Method and Weather

Author:
Richard H. Hart; G. E. Carlson; H. J. Retzer
Source:
Agronomy journal 1968 v.60 no.4 pp. 385-388
ISSN:
0002-1962
Subject:
Festuca arundinacea; Trifolium repens; drought; forage yield; germination; irrigation; soil types; soil water; sowing; spring; summer
Abstract:
... We drilled and broadcast-seeded tall rescue (Festuca arundinacea Schreb.) and white clover (Trifolium repens L.) on three soil types, on 29 dates in 1963 and 1964. Tall rescue yields of the spring after seeding were generally higher from drilled than from broadcast stands. Although drought in the spring of 1965 reduced yields from most of the 1964 seedings, rescue yields were mainly limited by soi ...
DOI:
10.2134/agronj1968.00021962006000040016x

49. Expected values of costs and revenues dependent on drought†

Author:
A.M.W. Verhagen; F. Hirst; Alan G. Lloyd
Source:
Australian journal of agricultural and resource economics 1968 v.12 no.2 pp. 52-57
ISSN:
1364-985X
Subject:
drought; probability; variance; Queensland
Abstract:
... In earlier papers on drought, sequences of wet and dry months were treated as realisations of binomial trials with periodic probabilities of failure (dry months), and the cost‐revenue outcomes of alternative drought strategies were handled probabilistically. When costs and revenues may be represented by a set of second degree polynomials over a set of adjacent subranges of the time scale, their ...
DOI:
10.1111/j.1467-8489.1968.tb00048.x

50. Influence of Planting Date on Certain Morphological Characteristics of Castorbeans

Author:
D. L. Kittock; J. H. Williams
Source:
Agronomy journal 1968 v.60 no.4 pp. 401-403
ISSN:
0002-1962
Subject:
Ricinus communis; castor beans; drought; hypocotyls; irrigation; plant height; plant morphology; planting date; racemes; soil
Abstract:
... Castorbean (Ricinus communis L.) plants were taken from irrigated and nonirrigated date-of-planting tests for 3 years to determine the effect of planting date on plant morphology. Planting date had no effect on plant height, except where drought was a factor. Hypocotyl diameter at harvest was significantly smaller with later planting dates. The number of nodes below the primary raceme, the distanc ...
DOI:
10.2134/agronj1968.00021962006000040021x