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You searched for: Journal name Agronomy journal Remove constraint Journal name: Agronomy journal Publication year rev 8020-1980 Remove constraint Publication year rev: 8020-1980 Source 1980 v.72 no.6 Remove constraint Source: 1980 v.72 no.6
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1. A Small Plot Drag for Use on Bermudagrass or Similar Sods

Author:
T. C. Keisling; Edwin Holt
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

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

Author:
R. W. Lytle; R. J. Hull
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

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

Author:
C. R. Campbell; J. F. Chaplin; W. H. Johnson; G. S. Miner
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

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

Author:
C. S. T. Daughtry; M. E. Bauer; D. W. Crecelius; M. M. Hixson
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

5. Irrigation Regime and Honeybee Activity as Related to Seed Yield in Alfalfa

Author:
A. Goldman; A. Dovrat
Source:
Agronomy journal 1980 v.72 no.6 pp. 961-965
ISSN:
0002-1962
Subject:
Medicago sativa; agronomy; alfalfa; death; honey bees; irrigation management; pollen; quantitative analysis; seed yield; soil water; sprinkler irrigation
Abstract:
... Seed yields of alfalfa (Medicago sativa L.) vary capriciously in time and space. This variation seems mainly caused by the delicate interplay between plant factors monitored by soil moisture availability and the obligate tripping requirement of alfalfa flowers by pollinators. The object of this study was to quantify the main effects and interactions between water application to the alfalfa field a ...
DOI:
10.2134/agronj1980.00021962007200060023x

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

Author:
Michael Collins; Armando M. Ferreira; Dwayne A. Rohweder; Neal A. Jorgensen
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

7. Magnesium in Grasses of Three Selected Regions in the United States and its Relation to Grass Tetany

Author:
Joe Kubota; G. H. Oberly; E. A. Naphan
Source:
Agronomy journal 1980 v.72 no.6 pp. 907-914
ISSN:
0002-1962
Subject:
Oregon; agronomy; cattle; disease incidence; grass tetany; lakes; magnesium; soil parent materials; temperature; volcanic ash; Maine; Michigan; Nevada; North Carolina; Wisconsin
Abstract:
... Grass tetany, a conditioned Mg deficiency, is a serious nutritional disease in cattle in various parts of the United States. While year to year variability is high, disease incidence is notably higher in some areas than others, indicating that soils, species of grasses, and temperature may be contributing factors. The Mg concentrations in grasses were determined to identify regional patterns and f ...
DOI:
10.2134/agronj1980.00021962007200060011x

8. Measuring Soil Nitrogen Mineralization Under Field Conditions

Author:
D. T. Westermann; S. E. Crothers
Source:
Agronomy journal 1980 v.72 no.6 pp. 1009-1012
ISSN:
0002-1962
Subject:
Solanum tuberosum; Zea mays; agronomy; corn; fallow; fertilizer application; mineralization; nitrogen; nitrogen fertilizers; polyethylene; potatoes; rhizosphere; soil water content; temperature
Abstract:
... The amount and rate of soil N mineralization are important components that can be used to predict preplant N fertilizer application and to evaluate the need for N fertilization during crop growth. This study‘s purpose was to evaluate the buried polyethylene bag technique as a method for characterizing the N mineralized under field conditions during the cropping season. Soil (Xerollic Calciorthids) ...
DOI:
10.2134/agronj1980.00021962007200060034x

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

Author:
R . W. Leamer; J. R. Noriega; A. H. Gerbermann
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

10. Residual Effects of MSMA on Sterility in Rice Cultivars

Author:
J. T. Gilmour; B. R. Wells
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

11. Salinity, Irrigation Frequency, and Fertilization Effects on Barley Growth

Author:
R. J. Wagenet; W. F. Campbell; A. M. Bamatraf; D. L. Turner
Source:
Agronomy journal 1980 v.72 no.6 pp. 969-974
ISSN:
0002-1962
Subject:
Hordeum vulgare; Ustifluvents; agronomy; barley; grain yield; greenhouse experimentation; irrigation scheduling; irrigation water; nitrogen; salt tolerance; silty clay loam soils; soil fertility; soil salinity; tillering; water salinity
Abstract:
... The response of a grain crop to yield variables such as salinity, soil fertility and irrigation often depends upon the integrated and simultaneous effects of these factors. A greenhouse study was therefore conducted to investigate the interactive effects of water salinity, N and P fertilization, and irrigation scheduling on barley (Hordeum vulgare L.). Three water salinity levels, four N fertiliza ...
DOI:
10.2134/agronj1980.00021962007200060025x

12. Sulfur Diagnostic Criteria as Affected by Age and Defoliation of Subclover

Author:
M. B. Jones; J. E. Ruckman; W. A. Williams; R. L. Koenigs
Source:
Agronomy journal 1980 v.72 no.6 pp. 1043-1046
ISSN:
0002-1962
Subject:
Trifolium subterraneum; annual grasslands; defoliation; fertilizer application; grazing; greenhouses; growing season; leaves; legumes; plant age; planting; soil; sulfates; sulfur; sulfur fertilizers; California
Abstract:
... Sulfur deficiencies are widespread in California annual grasslands and in other areas of the world where subclover (Trifolium subterraneum L.) is an important legume. Intensive grazing is often practiced where subclover is grown. Therefore, to determine the need for S fertilization it is important to know how defoliation and plant age influence the diagnostic tissue tests used to assay subclover S ...
DOI:
10.2134/agronj1980.00021962007200060042x

13. Use of the Third Youngest Leaf to Estimate Leaf Area in Kentucky Bluegrass

Author:
J. L Eggens
Source:
Agronomy journal 1980 v.72 no.6 pp. 1061-1063
ISSN:
0002-1962
Subject:
Poa pratensis; cultivars; forage; greenhouses; growth chambers; leaf area; leaf blade; leaf length; mowing; rhizomes; rhizosphere; stress response; sward; tillers; turf grasses; vermiculite
Abstract:
... Periodic, non−destructive data on the number of leaves, tillers, and emerged rhizomes are basic to the determination of turfgrass response to stress. Although the leaf area of turfgrasses is also markedly affected by stress, it is difficult and time−consuming to obtain without injury to the herbage. To determine if the leaf measurements of a specific leaf of each plant is correlated to the same le ...
DOI:
10.2134/agronj1980.00021962007200060046x

14. A Retractable, Neutron-Probe Access Tube

Author:
D. M. Glenn; R. L. Henderson; F. E. Bolton
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

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

Author:
J. S. Boyer; R. R. Johnson; S. G. Saupe
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

16. Ammonia Exchange at the Land Surface

Author:
Edgar Lemon; Raymond Van Houtte
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

17. Cotton Production Affected by Row Profile and N Rates

Author:
C. H. Harris; C. Wayne Smith
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

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

Author:
K. H. Quesenberry; W. R. Ocumpaugh
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

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

Author:
J. Q. Lynd; Ronald W. McNew; George V. Odell
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

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

Author:
C. D. Foy; P. W. Voigt; J. W. Schwartz
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