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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. Afternoon Water Deficits and Grain Yields in Old and New Soybean Cultivars

Author:
Boyer, J. S.; Johnson, R. R.; Saupe, S. G.
Source:
Agronomy journal 1980 v.72 no.6 pp. 981-986
ISSN:
0002-1962
Subject:
Glycine max; agronomy; canopy; cultivars; leaves; photosynthesis; plant available water; soybeans; Illinois
Abstract:
... Plant water deficits affect many metabolic processes, and soybean (Glycine max L. Merr.) is subject to water deficits during midday even when soil water is adequate under field conditions. Our objective was to determine if yield improvement by plant breeding has been associated with avoidance of these deficits in soybean. A 3- year experiment was conducted on highly productive soils in central Ill ...
DOI:
10.2134/agronj1980.00021962007200060028x

2. Ammonia Exchange at the Land Surface

Author:
Lemon, Edgar; Van Houtte, Raymond
Source:
Agronomy journal 1980 v.72 no.6 pp. 876-883
ISSN:
0002-1962
Subject:
Elymus repens subsp. repens; Glycine max; Medicago sativa; absorption; agronomy; air; alfalfa; ammonia; biosphere; computer simulation; nitrogen fixation; soil; vegetation; wind
Abstract:
... Studies of NH₃ exchange between plant leaves and air have mostly been made in controlled chambers where the concentrations were far above the ambient atmospheric levels usually found in nature. Under such conditions leaves act as an infinite sink for NH₃. More recent controlled chamber studies, however, have shown NH₃ evolving from leaves when concentrations were nearer to those of the atmosphere. ...
DOI:
10.2134/agronj1980.00021962007200060005x

3. Annual Carbohydrate Variation in Culms and Rhizomes of Smooth Cordgrass (Spartina alterniflora Loisel.)

Author:
Lytle, R. W.; Hull, R. J.
Source:
Agronomy journal 1980 v.72 no.6 pp. 942-946
ISSN:
0002-1962
Subject:
Spartina alterniflora; Sulfaquents; agronomy; autumn; chloroform; culms; energy balance; ethanol; perchloric acid; perennial grasses; rhizomes; salt marshes; spring; starch; sucrose; sugar content; vegetative growth; winter
Abstract:
... The productivity and stability of northeastern Atlantic tidal salt marshes depend largely upon the growth and persistence of the tall and short ecophenes of smooth cordgrass (Spartina alterniflora Loisel.). While the annual energy balance upon which perennial grass persistence depends has been studied in the tall form, no such information is available for the short form. The seasonal energy relati ...
DOI:
10.2134/agronj1980.00021962007200060019x

4. 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

5. A Small Plot Drag for Use on Bermudagrass or Similar Sods

Author:
Keisling, T. C.; Holt, Edwin
Source:
Agronomy journal 1980 v.72 no.6 pp. 1063-1064
ISSN:
0002-1962
Subject:
Cynodon dactylon; agronomy; pastures
Abstract:
... Many types of drags and spike tooth harrows have been used in pasture work. Most are not suitable for small plot work with bermudagrass because of lack of uniformity resulting from the dragging operation, fouling and clogging of the teeth with plant parts, and their cumbersome operation. This note describes a small unit which drags a plot uniformly, exhibits essentially no fouling or clogging of t ...
DOI:
10.2134/agronj1980.00021962007200060047x

6. Close-Grown Tobacco: Yield, Alkaloids, and Sugar Content by Stalk Position

Author:
Campbell, C. R.; Chaplin, J. F.; Johnson, W. H.; Miner, G. S.
Source:
Agronomy journal 1980 v.72 no.6 pp. 929-932
ISSN:
0002-1962
Subject:
Nicotiana tabacum; agronomy; alkaloids; flue-cured tobacco; loamy sand soils; sugar content
Abstract:
... Flue-cured tobacco (Nicotiana tabacum L.) produced in a close-grown system may offer an alternative to use of synthetic smoking materials. In order to develop optimum production and handling practices for this system, information is needed on the chemical and physical contents of the harvested material. Tobacco (‘Sp C-28’) was produced in a close-grown system with varying plant populations (45,448 ...
DOI:
10.2134/agronj1980.00021962007200060016x

7. Cotton Production Affected by Row Profile and N Rates

Author:
Harris, C. H.; Smith, C. Wayne
Source:
Agronomy journal 1980 v.72 no.6 pp. 919-922
ISSN:
0002-1962
Subject:
Alfisols; Gossypium hirsutum; agronomy; cotton; early development; nitrates; silt loam soils; surface drainage; Arkansas
Abstract:
... Cotton (Gossypium hirsutum L.) production in the Delta of Arkansas requires 150+ days from planting to final harvest. The evolved system for growing cotton includes planting on raised beds with N applied preplant into or under the bed. Maturity delays and associated yield reductions in recent years may have been related to this system. A study was initiated in 1975 to compare four genotypes grown ...
DOI:
10.2134/agronj1980.00021962007200060014x

8. Crude Protein, IVOMD, and Yield of Stockpiled Limpograsses

Author:
Quesenberry, K. H.; Ocumpaugh, W. R.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1021-1024
ISSN:
0002-1962
Subject:
Hemarthria altissima; agronomy; animals; crude protein; cultivars; digestibility; digestion; dry matter accumulation; forage; linear models; organic matter; regression analysis
Abstract:
... Most tropical grasses show a marked decline in digestibility with age, thus a system of field stockpiling is not suitable. The purpose of this research was to investigate the use of three limpograss (Hemarthria altissima [Poir] Stapf. et C. E. Hubb) cultivars as autumn-winter conserved forage. In 1976, plots of each cultivar were clipped and allowed to regrow from 1 July, 29 July, and 26 August. S ...
DOI:
10.2134/agronj1980.00021962007200060037x

9. Defoliation Effects on Regrowth, Nodulation, and Nitrogenase Activity at Anthesis with Hairy Vetch

Author:
Lynd, J. Q.; McNew, Ronald W.; Odell, George V.
Source:
Agronomy journal 1980 v.72 no.6 pp. 991-994
ISSN:
0002-1962
Subject:
; Paleustalfs; Rhizobium; Vicia villosa; agronomy; defoliation; flowering; nitrogen fixation; nitrogenase; nodulation; pH; pastures; pot culture; quantitative analysis; regrowth; tillering
Abstract:
... Pasture legumes present a great potential to increase productivity of pastures. Little information is now available concerning quantitative evaluation of symbiotic N fixation with pasture legumes such as hairy vetch (Vicia villosa, Roth). Results from 3 years of study are summarized to determine the influence of defoliation and regrowth on tillering, nodulation, and nitrogenase activity (C₂H₂ redu ...
DOI:
10.2134/agronj1980.00021962007200060030x

10. 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

11. 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

12. 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

13. Effects of Management Practices on Reflectance of Spring Wheat Canopies

Author:
Daughtry, C. S. T.; Bauer, M. E.; Crecelius, D. W.; Hixson, M. M.
Source:
Agronomy journal 1980 v.72 no.6 pp. 1055-1060
ISSN:
0002-1962
Subject:
Triticum aestivum; agricultural experiment stations; agronomy; biomass; canopy; crop production; cultivars; fertilizer rates; inventories; leaf area index; maturity stage; nitrogen; plant height; reflectance; seedlings; soil water; spectral analysis; spring wheat; tillering; vegetation cover; wavelengths; North Dakota
Abstract:
... Analyses of multispectral measurements from satellites offer the potential to monitor and inventory crop production. The crop canopy is a dynamic entity influenced by many cultural and environmental factors. In order to quantify and understand some of these potential sources of variation in spectral measurements of crops, an experiment was conducted on a Williams loam (fine−loamy, mixed Typic Argi ...
DOI:
10.2134/agronj1980.00021962007200060045x

14. 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

15. 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

16. 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

17. 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

18. 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

19. Imbibitional Chilling Injury in Soybean Axes: Relationship to Stelar Lesions and Seasonal Environments

Author:
Ashworth, E. N.; Oberdorf, R. L.
Source:
Agronomy journal 1980 v.72 no.6 pp. 923-928
ISSN:
0002-1962
Subject:
Glycine max; agronomy; cold; cultivars; germination; hypocotyls; imbibition; seedling growth; soybeans; stele; water content
Abstract:
... The increasing use of isolated embryonic axes as experimental issues for studies on early germination events warrants an evaluation of stress effects during hydration. The objectives were to evaluate embryonic axis growth and stress crack formation in soybean (Glycine max (L.) Merr.) seeds and isolated axes resulting from hydrational stresses of cold temperatures and low tissue moisture. Sensitivi ...
DOI:
10.2134/agronj1980.00021962007200060015x

20. 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