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You searched for: Journal Agronomy journal Remove constraint Journal: Agronomy journal Publication Year 1980 Remove constraint Publication Year: 1980 Source 1980 v.72 no.6 Remove constraint Source: 1980 v.72 no.6
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1. A Retractable, Neutron-Probe Access Tube

Author:
Glenn, D. M.; Henderson, R. L.; Bolton, F. E.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1067-1068
ISSN:
0002-1962
Subject:
crop rotation; fallow; harrows; neutron probes; planters; planting; soil water; tillage
Abstract:
... Soil moisture measurements with a neutron-probe moisture meter provide a rapid and non-destructive means for measuring soil water in long-term studies. The inability of farm machinery to pass over the extended access tube limits its use in some situations. A retractable, neutronprobe access tube was designed to allow implement passage at the normal speed and tillage depth without contacting the ac ...
DOI:
10.2134/agronj1980.00021962007200060050x

2. Differential Tolerance of Weeping Lovegrass Genotypes to Acid Coal Mine Spoils

Author:
Foy, C. D.; Voigt, P. W.; Schwartz, J. W.
Source:
Agronomy journal 1980 v.72 no.6 pp. 859-862
ISSN:
0002-1962
Subject:
Eragrostis curvula; chlorosis; calcareous soils; acid soils; genotype
Abstract:
... Plant genotypes having greater tolerance to mineral stress are needed for use on problem soils. Two examples of such stress are mineral element toxicity (excess Al, Mn, etc.) in strongly acid soils and mine spoils, and Fe-related chlorosis in certain calcareous soils. Previous studies showed that genotypes of weeping lovegrass (Eragrostis curvula (Schrad.) (Nees) and Lehmann lovegrass (Eragrostis ...
DOI:
10.2134/agronj1980.00021962007200060001x

3. Dinitrogen Fixation (C2H2) by Established Forage Grasses in Texas

Author:
Weaver, R. W.; Wright, Sara F.; Varanka, M. W.; Smith, O. E.; Holt, E. C.
Source:
Agronomy journal 1980 v.72 no.6 pp. 965-968
ISSN:
0002-1962
Subject:
Andropogon gerardii; Brachiaria; Cynodon dactylon; Paspalum urvillei; acetylene; acetylene reduction; environmental factors; ethylene; ethylene production; forage grasses; forage production; greenhouses; indigenous species; introduced species; nitrogen fertilizers; nitrogen fixation; regrowth; rhizosphere; soil; subtropics; surveys; Texas
Abstract:
... Efficient forage production by grasses requires an input of fertilizer nitrogen. Fertilizer N applications substantially increase the cost of forage production. Development and management of a biological N fixation system for forage grasses would greatly increase forage production efficiency. As a first step toward development of such a system, a survey was undertaken in the subtropical region of ...
DOI:
10.2134/agronj1980.00021962007200060024x

4. Drought Sensitivity at Various Growth Stages of Barley in Relation to Relative Evapotranspiration and Water Stress

Author:
Mogensen, V. Overgaard
Source:
Agronomy journal 1980 v.72 no.6 pp. 1033-1038
ISSN:
0002-1962
Subject:
Hordeum; Udipsamments; barley; drought; drought tolerance; evapotranspiration; glass; grain yield; heading; irrigation; leaf water potential; loamy sand soils; lysimeters; plant available water; rain; ripening; water stress
Abstract:
... Previous investigations into the influence of drought on yield of barley (Hordeum distichurn L.) have been related to either the intensity of water stress or the duration of drought periods. Little attention has been given to the combination of intensity and duration of water stress. In this investigation drought sensitivity (F), calculated as relative grain yield reduction (1 — u/U) of barley at ...
DOI:
10.2134/agronj1980.00021962007200060040x

5. Establishment of Alfalfa by Conventional and Minimum-Tillage Seeding Techniques in a Quackgrass-Dominant Sward

Author:
Mueller-Warrant, G. W.; Koch, D. W.
Source:
Agronomy journal 1980 v.72 no.6 pp. 884-889
ISSN:
0002-1962
Subject:
Elymus repens subsp. repens; Haplorthods; Medicago sativa; alfalfa; application timing; discing; energy; forage; forage yield; glyphosate; labor; minimum tillage; mowing; paraquat; pesticide application; plant density; plowing; sandy loam soils; seedlings; sowing; sward
Abstract:
... Minimum-tillage establishment of forages offers potential advantages over the conventional method in terms of reducing energy and labor requirements, erosion hazard, and improving flexibility, and timeliness of operation. Our objective was to compare these methods of establishing alfalfa (Medicago sativa L.) with various herbicides, time intervals between herbicide application and seeding, and see ...
DOI:
10.2134/agronj1980.00021962007200060006x

6. Forage Quality Evaluation of Two Warm−Season Range Grasses Using Laboratory and Animal Measurements

Author:
Griffin, J. L.; Wangness, P. J.; Jung, G. A.
Source:
Agronomy journal 1980 v.72 no.6 pp. 951-956
ISSN:
0002-1962
Subject:
Andropogon gerardii; Festuca arundinacea; Panicum virgatum; animal feeding; autumn; beef; beef cows; cool season grasses; developmental stages; digestible dry matter; dry matter intake; forage grasses; forage quality; grass hay; herds; in vitro digestibility; nutrient requirements; protein supplements; regrowth; spring; summer; warm season; warm season grasses; wethers; Pennsylvania
Abstract:
... The shortage of available forage during mid−summer is considered a major factor limiting the size of beef cowcalf herds in the Northeast. Consequently, using warmseason perennial range grasses as a supplement to existing cool−season grass forage programs is being considered. Animal feeding trials were conducted to assess the forage quality of ‘NY 1145’ big bluestem (Andropogon gerardi Vitman), and ...
DOI:
10.2134/agronj1980.00021962007200060021x

7. Forage Quality of Adapted Dent and Tropical Flint Corn Grown as a Second Crop

Author:
Monson, Warren G.; Young, John R.; Johnson, Joseph C.
Source:
Agronomy journal 1980 v.72 no.6 pp. 975-977
ISSN:
0002-1962
Subject:
feed quality; flint corn; forage quality; insect resistance; risk reduction
Abstract:
... The added insect tolerance of the exotic flint corn or other similar varieties could reduce the risk involved in producing a second crop of corn without detracting from silage quality. ...
DOI:
10.2134/agronj1980.00021962007200060026x

8. Forage Quality of selected Warm−Season Weed Species

Author:
Bosworth, S. C.; Hoveland, C. S.; Buchanan, G. A.; Anthony, W. B.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1050-1054
ISSN:
0002-1962
Subject:
Cynodon dactylon; Pennisetum glaucum; calcium; crude protein; dry matter digestibility; flowering; forbs; fruiting; grass weeds; hay; in vitro digestibility; magnesium; metabolic diseases; nutrient content; nutritional adequacy; nutritive value; pastures; phosphorus; pure stands; ruminants; silage; vegetative growth; warm season; warm season grasses
Abstract:
... Although weeds are a common component of pasture, hay, and silage, limited information is available on forage quality of warm−season weeds. Forage quality of 17 warm−season weeds and two cultivated forage species seeded in pure stands was determined at vegetative, flowering, and fruiting development stages to ascertain nutritive value for ruminants. At the vegetative stage, 16 of the 17 weed speci ...
DOI:
10.2134/agronj1980.00021962007200060044x

9. Germination and Emergence of Russian Wildrye Seeds Coated with Hydrophilic Materials

Author:
Berdahl, J. D.; Barker, R. E.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1006-1008
ISSN:
0002-1962
Subject:
Psathyrostachys juncea; seed germination; seed dressings
Abstract:
... Most forage grasses have a small caryopsis that must be seeded at shallow depths to emerge. However, soil surrounding the seed often becomes too dry to support germination and seedling development. Agar, alginic acid, carragheenan, ‘Super Slurper’, and ‘Viterra 2 Hydrogel’₃ were incorporated into silica seed coatings of Russian wildrye (Elymus junceus Fisch.) to increase the quantity of water avai ...
DOI:
10.2134/agronj1980.00021962007200060033x

10. Influence of Induced Lodging on Pod Distribution and Seed Yield in Soybeans

Author:
Noor, Ramli Bin Mohd; Caviness, C. E.
Source:
Agronomy journal 1980 v.72 no.6 pp. 904-906
ISSN:
0002-1962
Subject:
Glycine max; branches; cultivars; flowering; lodging; men; pods; seed size; seed yield; seeds; soybeans; vegetative growth; Arkansas
Abstract:
... Lodging occurs frequently in soybeans [Glycine max (L.) Men.] and has been shown to reduce yields of indeterminate cultivars under most conditions: Information is limited on effects of lodging on determinate cultivars, types commonly grown in the southern U. S. Influence of lodging on pod distribution and seed yield was measured during a 2-year study in the field on ‘Forrest’, a determinate cultiv ...
DOI:
10.2134/agronj1980.00021962007200060010x

11. Influence of Soil Compaction on Three Turfgrass Species

Author:
Carrow, R. N.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1038-1042
ISSN:
0002-1962
Subject:
Festuca arundinacea; Lolium perenne; Poa pratensis; aeration; bulk density; carbohydrates; cold season; lawns and turf; montmorillonite; mowing; porosity; root growth; soil; soil compaction; soil-plant interactions; traffic; turf grasses; water content
Abstract:
... Wear and soil compaction from foot and vehicular traffic are major stresses on recreational turfgrass areas. Few investigations have been conducted on turf where only soil compaction stress was applied. In this field study the influence of soil compaction on morphological and physiological aspects of three turfgrass species was investigated. The cool season turfgrass species (Lolium perenne L. ‘Pe ...
DOI:
10.2134/agronj1980.00021962007200060041x

12. In Vivo Quality of Tall Fescue as Influenced by Season, Legumes, Age, and Canopy Strata

Author:
Rayburn, E. B.; Blaser, R. E.; Fontenot, J. P.
Source:
Agronomy journal 1980 v.72 no.6 pp. 872-876
ISSN:
0002-1962
Subject:
Dactylis glomerata; Festuca arundinacea; Medicago sativa; Trifolium pratense; alfalfa; animal performance; application rate; ash content; canopy; climate; digestibility; digestible dry matter; dormancy; dry matter accumulation; economic impact; forage; grazing; lignin; regrowth; sheep; summer; winter
Abstract:
... Fall-grown tall fescue (Festuca arundinacea, Schreb.) provides a relatively inexpensive forage for winter grazing. Quality and yield of actively growing tall fescue increases when accumulated from August and harvested through time in the early fall. The effect of regrowth age on fall accumulated tall fescue quality has not been evaluated under similar harvest climates and animal performance on sum ...
DOI:
10.2134/agronj1980.00021962007200060004x

13. Laboratory Analyses for Predicting Digestibility and Intake of Corn Silage

Author:
Collins, Michael; Ferreira, Armando M.; Rohweder, Dwayne A.; Jorgensen, Neal A.
Source:
Agronomy journal 1980 v.72 no.6 pp. 889-892
ISSN:
0002-1962
Subject:
Zea mays; corn; corn silage; dry matter digestibility; dry matter intake; forage; maturity stage; neutral detergent fiber; nitrogen; rumen fermentation; starch
Abstract:
... High starch samples are difficult to filter using the neutral detergent fiber (NDF) method. Additional research is also required to identify the best in vitro dry matter disappearance (IVDMD) technique for prediction of in vivo digestibility of whole-plant corn (Zea mays L.) forage. We designed experiments to compare methods of NDF and IVDMD determination for predicting in vivo intake and digestib ...
DOI:
10.2134/agronj1980.00021962007200060007x

14. Mammoth Genotypes and Tobacco Management Regimes for Reduced Production of Downstalk Tobaccos

Author:
Wernsman, E. A.; Matzinger, D. F.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1047-1050
ISSN:
0002-1962
Subject:
Nicotiana; alkaloids; apical dominance; apical meristems; cultivars; field experimentation; flue-cured tobacco; genotype; leaves; production technology; reducing sugars; sugar content
Abstract:
... Demand for flue−cured tobacco (Nicotiana tubacum L.) from basal leaf positions has decreased in recent years, and production systems which maximize higher quality, upstalk, leaf grades are needed. In this study we tested production regimes utilizing photoperiod−sensitive genotypes to prevent flowering and produce additional upstalk leaves as a substitute for discarded basal leaves. Normal and phot ...
DOI:
10.2134/agronj1980.00021962007200060043x

15. Nitrogen Fertilization of Meadowfoam

Author:
Johnson, J. W.; Devine, M. B.; Kleiman, R.; White, G. A.
Source:
Agronomy journal 1980 v.72 no.6 pp. 917
ISSN:
0002-1962
Subject:
Limnanthes alba; plant nutrition; nitrogen; fertilizer application; ammonium nitrate; application rate; application timing; oilseed crops; oil crops; seeds; yields; protein content; lipid content; plant growth; winter hardiness
Abstract:
... Benth. is a potential oil seed crop with unique long chain fatty acids. Information available on the fertility needs for meadowfoam is scarce. Therefore the effects of rate and time of application of N fertilization on seed yield, seed weight, protein, oil, winter survival, flowering date, plant height, and erectness of meadowfoam were studied in the field for 2 years in Maryland. Nitrogen as ammo ...
Handle:
10113/28745
DOI:
10.2134/agronj1980.00021962007200060013x

16. Planting Date Effects on Growth, Yield, and Oil of Irrigated Sunflower

Author:
Unger, Paul W.
Source:
Agronomy journal 1980 v.72 no.6 pp. 914
ISSN:
0002-1962
Subject:
Helianthus annuus; planting date; plant growth; plant development; soil temperature; crop yield; sunflower oil; fatty acid composition; linoleic acid; oleic acid; irrigated farming; Texas
Abstract:
... Interest in sunflower (L.) as an oilseed crop has greatly increased in the Southern Great Plains since 1974. To effectively manage sunflower for oil production and oil quality, information is needed concerning the effect of various agronomic practices. The objective of this research was to determine the effect of planting date on growth, yield, oil percent, and oil fatty acid concentration of irri ...
Handle:
10113/494
DOI:
10.2134/agronj1980.00021962007200060012x

17. Reflectance of Wheat Cultivars as Related to Physiological Growth Stages

Author:
Leamer, R . W.; Noriega, J. R.; Gerbermann, A. H.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1029-1032
ISSN:
0002-1962
Subject:
Triticum aestivum; booting stage; chlorophyll; crop yield; cultivars; harvesting; leaves; plant growth; planting; reflectance; remote sensing; sandy clay loam soils; seasonal variation; spectroradiometers; wavelengths; wheat; yield forecasting; Texas
Abstract:
... Crop yield predictions are based on a comparison between the rate of growth of the current crop and the normal crop-calendar. Remotely sensed reflectance data provide an indication of the amount of plant growth. In this investigation, we followed the seasonal changes in reflectance of three cultivars of wheat (Triticum aestivum L.) as related to their physiological development. Reflectances over t ...
DOI:
10.2134/agronj1980.00021962007200060039x

18. Regrowth and Alcohol Dehydrogenase Activity in Waterlogged Alfalfa and Birdsfoot Trefoil

Author:
Barta, A. L.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1017-1020
ISSN:
0002-1962
Subject:
Lotus corniculatus; Medicago sativa; Phytophthora megasperma; acetylene reduction; alcohol dehydrogenase; alfalfa; carbohydrates; enzyme activity; ethanol; flooded conditions; flooding tolerance; greenhouse experimentation; hypoxia; leaves; regrowth; roots; shoots; zoospores
Abstract:
... Susceptability of alfalfa (Medicago sativa L.) to waterlogging injury seriously limits its persistance and adaptability. Waterlogging injury and accumulation of ethanol under root anoxia may be causal agents which facilitate or promote infection by Phytophthora megasperma Drechsler zoospores and result in “root rot” of alfalfa. While induction of alcohol dehydrogenase (ADH) and increased root accu ...
DOI:
10.2134/agronj1980.00021962007200060036x

19. Residual Effects of MSMA on Sterility in Rice Cultivars

Author:
Gilmour, J. T.; Wells, B. R.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1066-1067
ISSN:
0002-1962
Subject:
Albaqualfs; Glycine max; MSMA (herbicide); Oryza sativa; arsenic; crop production; crop rotation; cultivars; drying; herbicide residues; herbicide resistance; plant fertility; residual effects; rice; silt loam soils; soybeans; water management
Abstract:
... In a study conducted in 1975, sterility in rice (Oryza sativa L.) cultivars grown on Crowley silt loam soil (Typic Albaqualf) amended with monosodium methanearsonate (MSMA) increased as cultivar susceptibility to straight-head increased. A midseason drain and dry treatment was found to decrease MSMA induced sterility. This study was a continuation of the experiment initiated in 1975 to evaluate th ...
DOI:
10.2134/agronj1980.00021962007200060049x

20. Response of Sunflower to Plant Population

Author:
Robinson, R. G.; Ford, J. H.; Luenschen, W. E.; Rabas, D. L.; Smith, L. J.; Warnes, D. D.; Wiersma, J. V.
Source:
Agronomy journal 1980 v.72 no.6 pp. 869-871
ISSN:
0002-1962
Subject:
Calciaquolls; Helianthus annuus; cultivars; desiccants; drying; harvest date; oils; oilseeds; planting; population growth; rain; row spacing; sandy soils; seed quality; seeds; soil water; temperature; Minnesota
Abstract:
... The cost of hybrid sunflower (Helianthus annuus L.) seed provides an incentive for reducing planting rates which, in turn, reduce plant populations. This research was undertaken to determine minimum populations needed for maximum yield and their effect on seed quality and head drying. Populations of oilseed and nonoilseed cultivars of 17, 25, 37, 49, and 62 thousand plants/ha were established at s ...
DOI:
10.2134/agronj1980.00021962007200060003x