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You searched for: Journal name Agronomy journal Remove constraint Journal name: Agronomy journal Publication year rev 8015-1985 Remove constraint Publication year rev: 8015-1985 Source 1985 v.77 no.6 Remove constraint Source: 1985 v.77 no.6
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1. Aluminum Toxicity Effects on Growth and Nutrient Composition in Wheat

Author:
K. Ohki
Source:
Agronomy journal 1985 v.77 no.6 pp. 951-956
ISSN:
0002-1962
Subject:
Triticum aestivum; agronomy; aluminum; crop production; cultivars; greenhouses; leaves; nutrient content; nutrient solutions; plant height; soil pollution; tissue analysis; toxicity; wheat
Abstract:
... Aluminum toxicity is frequently the limiting factor to crop production in acid soils. The diagnosis of Al toxicity for a specific wheat (Triticum aestivum L.) cultivar could be simplified by tissue analysis. Greenhouse studies were undertaken to determine the critical Al toxicity level for the cultivar ‘Stacy’ and tissue nutrients affected by Al status. Wheat plants were grown in 10 levels of Al ( ...
DOI:
10.2134/agronj1985.00021962007700060027x

2. Corn Irrigation Scheduling in Humid Regions on Sandy Soils with Tillage Pans

Author:
D. K. Cassel; C. K. Martin; J. R. Lambert
Source:
Agronomy journal 1985 v.77 no.6 pp. 851-855
ISSN:
0002-1962
Subject:
Zea mays; irrigation scheduling; tillage; sandy soils; soil density; coastal plains; humid zones; North Carolina
Abstract:
... Several droughts during the past decade in humid regions of the USA, especially the Southeast, have intensified the interest in supplemental irrigation. One objective of this study was to evaluate the effect of supplemental irrigation in a humid environment on corn (Zea mays L.) production on an Atlantic Coastal Plain soil having a tillage pan. A second objective was to evaluate two alternative te ...
DOI:
10.2134/agronj1985.00021962007700060006x

3. Dry Matter and Nitrogen Partitioning in Mechanically Dewatered Alfalfa, Red Clover, and Birdsfoot Trefoil

Author:
Michael Collins
Source:
Agronomy journal 1985 v.77 no.6 pp. 923-927
ISSN:
0002-1962
Subject:
Medicago sativa; Trifolium pratense; Lotus corniculatus; dewatering; pressing; silage; nitrogen content; Wisconsin
Abstract:
... Improved forage harvesting techniques are needed to reduce the losses incurred during field drying silage or hay, especially in areas where rainfall is high. A 2-yr field study was conducted to evaluate mechanical dewatering of first cutting forage of alfalfa (Medicago sativa L.), red clover (Trifolium pratense L.) and birdsfoot trefoil (Lotus corniculatus L.) harvested at four maturity stages. Se ...
DOI:
10.2134/agronj1985.00021962007700060021x

4. Effects of Phosphorus, Calcium, and Hup− and Hup+ Rhizobia on Pigeon Pea Yields in an Infertile Tropical Soil

Author:
B. S. Hernandez; D. D. Focht
Source:
Agronomy journal 1985 v.77 no.6 pp. 867-871
ISSN:
0002-1962
Subject:
Cajanus cajan; fertilizers; nitrogen fixation; phosphorus; calcium; nodulation; Rhizobium; tropical soils; tropics; ferredoxin hydrogenase; Panama
Abstract:
... Pigeon peas [Cajanus cajan (L.) Millsp. var. 64-28] were grown in the Republic of Panama in an infertile acid Oxisol (Bayano) in both greenhouse and field studies to determine if yield parameters could be increased by addition of P, Ca, and Rhizobium. In the greenhouse, P additions to the Bayano soil increased shoot and nocule weights, acetylene reduction activity, and hydrogen evolution, but neit ...
DOI:
10.2134/agronj1985.00021962007700060010x

5. Effects of Sod-Seeding Legumes on Hill Land Pasture Productivity and Composition

Author:
W. B. Bryan
Source:
Agronomy journal 1985 v.77 no.6 pp. 901-905
ISSN:
0002-1962
Subject:
Trifolium pratense; Lotus corniculatus; range management; permanent grasslands; West Virginia
Abstract:
... Production and quality of hill land pasture may be improved by introducing a legume. Sod-seeding is used extensively to introduce legumes into grassland, but little work has been reported for hill land pasture. Two identical experiments were conducted to determine the productivity and composition of hill land pasture when sod-seeded with red clover (Trifolium pratense L.) and birdsfoot trefoil (Lo ...
DOI:
10.2134/agronj1985.00021962007700060016x

6. Growth, Nitrogen Uptake, and Partitioning in Nitrogen-Fertilized Nodulating and Nonnodulating Peanut

Author:
A. Selamat; F. P. Gardner
Source:
Agronomy journal 1985 v.77 no.6 pp. 862-867
ISSN:
0002-1962
Subject:
Arachis hypogaea; nitrogen metabolism; nitrogen fertilizers; nodulation; yields; genotype; Florida
Abstract:
... Peanut (Arachis hypogaea L.) is known to be effective in symbiotic N2 fixation, but N deficiencies may occur during rapid vegetative and/or reproductive growth. The effects of N fertilization on growth, N uptake, and N partitioning in nodulating and nonnodulating peanut genotypes were studied during 1982 in the field and a greenhouse experiment at the University of Florida, Gainesville. Three line ...
DOI:
10.2134/agronj1985.00021962007700060009x

7. Influence of Climatic Factors and Forage Age on the Chemical Components of Ryegrass Related to Grass Tetany

Author:
D. J. R. Cherney; D. L. Robinson
Source:
Agronomy journal 1985 v.77 no.6 pp. 827-830
ISSN:
0002-1962
Subject:
Lolium multiflorum; grass tetany; climatic factors; soil water content; magnesium; aluminum; forage evaluation; chemical constituents of plants
Abstract:
... Climatic factors are known to influence several soil-plant-animal relationships, including many criteria used to evaluate the grass tetany potential of forages. Specific climatic influences on these criteria are not well understood. Our objectives were to evaluate effects of growth temperature, soil moisture level, length of flooded period, and forage age on the following forage chemical parameter ...
DOI:
10.2134/agronj1985.00021962007700060001x

8. Molybdenum Limitations to Alfalfa Growth and Nitrogen Content on a Moderately Acid, High-Phosphorus Soil

Author:
T. A. Doerge; P. J. Bottomley; E. H. Gardner
Source:
Agronomy journal 1985 v.77 no.6 pp. 895-901
ISSN:
0002-1962
Subject:
Medicago sativa; soil pH; liming; nitrogen; molybdenum; phytotoxicity; nodulation; Oregon
Abstract:
... Alfalfa (Medicago sativa L.) grown in an Aquultic Argixeroll at pH 5.5 had a low N content and produced very low yields even though soil and/or plant tissue analysis for Al, Mn, Ca, P, Mo, and Mg did not indicate deficiency or toxicity conditions. Field and greenhouse experiments with pH, Ca, N, and Mo variables were undertaken to characterize the factor(s) limiting production of alfalfa on this s ...
DOI:
10.2134/agronj1985.00021962007700060015x

9. Photosynthetic Response of Soybean Canopies to Full-Season Carbon Dioxide Enrichment

Author:
B. Acock; V. R. Reddy; H. F. Hodges; D. N. Baker; J. M. McKinion
Source:
Agronomy journal 1985 v.77 no.6 pp. 942-947
ISSN:
0002-1962
Subject:
Glycine max; photosynthesis; canopy; air pollution; growth chambers; carbon dioxide
Abstract:
... Global atmospheric CO₂ concentration ([CO₂]) is increasing as a result of the burning of fossil fuels. At present there is little information about how agronomic crops will respond to future high [CO₂]. To investigate the basic process that will be most affected, soybean [Glycine max (L.) Merr.] canopies were continuously exposed to various [CO₂] and photosynthetic rates were measured throughout t ...
DOI:
10.2134/agronj1985.00021962007700060025x

10. Pre-Anthesis Defoliation Effects on Six Corn Inbreds

Author:
B. L. Vasilas; R. D. Seif
Source:
Agronomy journal 1985 v.77 no.6 pp. 831-835
ISSN:
0002-1962
Subject:
Zea mays; defoliation; inbred lines; flowering; yield components; correlation; Illinois
Abstract:
... Yield loss due to defoliation prediction charts have been developed for corn (Zeu mays L.) hybrids, but not for inbreds. The latter is needed by the hail-loss insurance industry. Field experiments were conducted at the University of Illinois on a Drummer silty clay loam (Typic Haplaquoll) in 1982 and a Flanagan silt loam (Aquic Argiudoll) in 1983 to evaluate the response of six corn (Zeu mays L.) ...
DOI:
10.2134/agronj1985.00021962007700060002x

11. Screening for Low Fertility Tolerance among Peanut Cultivars

Author:
W. D. Branch; G. J. Gascho
Source:
Agronomy journal 1985 v.77 no.6 pp. 963-965
ISSN:
0002-1962
Subject:
Arachis hypogaea; cultivars; soil fertility; variety trials; Georgia
Abstract:
... Because of expansion of additional hectareage onto marginal soil types and the economical need to reduce production inputs, differential genetic responses to lower fertility practices need to be sought within crop species. During 1981 through 1983, tests were conducted to evaluate 24 peanut (Arachis hypogaea L.) cultivars under low soil fertility. The Tifton loamy sand (fine-loamy, siliceous, ther ...
DOI:
10.2134/agronj1985.00021962007700060031x

12. Seed Yield of Austrian Winter Field Peas Intercropped with Winter Cereals

Author:
G. A. Murray; J. B. Swensen
Source:
Agronomy journal 1985 v.77 no.6 pp. 913-916
ISSN:
0002-1962
Subject:
Pisum sativum; Triticum aestivum; Hordeum vulgare; multiple cropping; winter; yields; Idaho
Abstract:
... Intercropping has improved the production of annual food grasses and legumes in several warm-season areas of the world. Winter cereals intercropped with winter peas may improve winter pea yields in many cool-season areas. The primary objective of this study was to compare seed yield of winter peas in mono- and intercropped culture in northern Idaho. Winter peas (Pisum sativum spp. arvense L. Poir) ...
DOI:
10.2134/agronj1985.00021962007700060019x

13. Transmitted and Absorbed Photosynthetically Active Radiation in Grain Sorghum

Author:
W. D. Rosenthal; G. F. Arkin; T. A. Howell
Source:
Agronomy journal 1985 v.77 no.6 pp. 841-845
ISSN:
0002-1962
Subject:
inflorescences; stems; Sorghum bicolor; photosynthesis; leaves; California
Abstract:
... Relationships defining transmitted (TPAR) and absorbed (APAR) photosynthetically active radiation (PAR) in sorghum [Sorghum bicolor (L.) Moenchj canopies do not account for senesced leaves, stalks, and panicles after anthesis. Absorbed PAR by senesced leaves does not directly contribute to photosynthesis, whereas PAR absorbed by panicles does. In addition, senesced leaves, stalks, and panicles red ...
DOI:
10.2134/agronj1985.00021962007700060004x

14. Variability Among Plants in Dinitrogen Fixation (Acetylene Reduction) Rates by Field-Grown Soybean

Author:
R. F. Denison; P. R. Weisz; T. R. Sinclair
Source:
Agronomy journal 1985 v.77 no.6 pp. 947-950
ISSN:
0002-1962
Subject:
cultivars; Glycine max; acetylene; nodulation; New York; Florida
Abstract:
... High variability in acetylene reduction rates within cultivars and treatments has been a problem in evaluating treatment and cultivar effects. This study examined the sources of such variability, using field-grown soybean [Glycinee max (L.) Merr.] plants. Acetylene reduction rate per plant was measured in situ for thinned and unthinned ‘Chippewa 64’ soybean near Ithaca, NY for well-watered and dro ...
DOI:
10.2134/agronj1985.00021962007700060026x

15. A Versatile, Inexpensive Microcomputer-Based Leaf Area Measurement System

Author:
John M. Clarke; Thomas N. McCaig
Source:
Agronomy journal 1985 v.77 no.6 pp. 966-968
ISSN:
0002-1962
Subject:
agronomy; computer software; leaf area; leaves
Abstract:
... An inexpensive electro-optical system was developed and evaluated for measuring leaf areas. The system consisted of a standard optical lens and circuitry to digitize images, and was interfaced with a microcomputer. Software was developed to measure total leaf areas or differential green, chlorotic, and total areas. Cost of the system, excluding the microcomputer, was under $450. The system provide ...
DOI:
10.2134/agronj1985.00021962007700060032x

16. The Effect of Root Temperature and Nitrate/Ammonium Ratio on Strawberry Plants. II. Nitrogen Uptake, Mineral Ions, and Carboxylate Concentrations

Author:
Ruth Ganmore-Neumann; U. Kafkafi
Source:
Agronomy journal 1985 v.77 no.6 pp. 835-840
ISSN:
0002-1962
Subject:
Fragaria ananassa; nutrient uptake; root zone temperature; nitrogen fertilizers; carboxylic acids; anions; cations; minerals
Abstract:
... Strawberry plants (Fragaria ananasa Duch.) have shallow roots and are grown in the field during both hot and cold seasons. The possibility of irrigating and fertilizing the plants daily, through the trickle system, led to the question of what is the best nitrogen form and NO⁻₃/NH+₄ ratios to be supplied to this crop during the growing season. The effect of four root temperatures (10, 17, 25 and 32 ...
DOI:
10.2134/agronj1985.00021962007700060003x

17. Electronic Detection of Bolus Swallowing to Measure Forage Intake of Grazing Livestock

Author:
J. R. Forwood; M. M. Hulse; J. L. Ortbals
Source:
Agronomy journal 1985 v.77 no.6 pp. 969-972
ISSN:
0002-1962
Subject:
Andropogon gerardii; Dactylis glomerata; agronomy; dry matter intake; esophagus; fistulated animals; forage; hay
Abstract:
... Understanding forage intake of grazing livestock is critical to understanding their level of performance. Unfortunately, current methods of measuring intake of free-roaming ruminants are laborious and indirect. To overcome these problems, two devices were tested with confined animals to measure passage of boli within the esophagus of cattle (Bos taurus) as an estimate of intake. The first, labeled ...
DOI:
10.2134/agronj1985.00021962007700060033x

18. Estimating Ammonia Flux: A Comparison Between the Integrated Horizontal Flux Method and Theoretical Solutions of the Diffusion Profile

Author:
K. J. McInnes; D. E. Kissel; E. T. Kanemasu
Source:
Agronomy journal 1985 v.77 no.6 pp. 884-889
ISSN:
0002-1962
Subject:
ammonia; losses from soil; soil fertility; measurement; nitrogen fertilizers; Kansas
Abstract:
... Estimating the loss of N fertilizer as ammonia from the ground to the atmosphere via the integrated horizontal flux method (IHF) generally requires measurement of the mean atmospheric ammonia density and the mean wind speed at five or more heights. Using acid traps as a means of measuring ammonia density at that many heights over long periods of time proves laborious, and a way of reducing the num ...
DOI:
10.2134/agronj1985.00021962007700060013x

19. Forage and Nitrogen Contributions of Arrowleaf and Subterranean Clovers Overseeded on Bermudagrass and Bahiagrass

Author:
G. W. Evers
Source:
Agronomy journal 1985 v.77 no.6 pp. 960-963
ISSN:
0002-1962
Subject:
Cynodon dactylon; Paspalum notatum; Trifolium vesiculosum; Trifolium subterraneum; nitrogen fixation; nitrogen fertilizers; range management; pastures; Texas
Abstract:
... Tropical perennial grasses are the foundation of the pasture systems in the southeastern USA. However, they are low quality and require N fertilizer. Forage production and distribution and N accumulation of clover-grass mixtures were compared to that of the grass alone receiving various rates of N fertilizer on a Crowley soil (fine, mortmorillonitic, thermic Typic Albaqualf). ‘Coastal’ bermudagras ...
DOI:
10.2134/agronj1985.00021962007700060030x

20. Influence of Surface Liming on the Yield and Nutrient Concentration of Alfalfa Established Using No-Tillage Techniques

Author:
J. E. Rechcigl; D. D. Wolf; R. B. Reneau; W. Kroontje
Source:
Agronomy journal 1985 v.77 no.6 pp. 956-959
ISSN:
0002-1962
Subject:
Medicago sativa; liming; no-tillage; acid soils; aluminum; phytotoxicity; Virginia
Abstract:
... Soil acidity is believed to be an important cause of limited root penetration and low herbage yields of alfalfa (Medicago sativa L.). Alfalfa was seeded into an orchardgrass (Dactylis glomerata L.) sod to evaluate the influence of surface-applied limestone on alfalfa growth under acidic soil conditions. Alfalfa was planted without tillage in April of 1981 and 1982 on an Ernest silt loam soil (fine ...
DOI:
10.2134/agronj1985.00021962007700060028x