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You searched for: Journal name Agronomy journal Remove constraint Journal name: Agronomy journal Publication year rev 8023-1977 Remove constraint Publication year rev: 8023-1977 Source 1977 v.69 no.4 Remove constraint Source: 1977 v.69 no.4
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1. A Portable Chamber for Rapid Evapotranspiration Measurements on Field Plots

Author:
D. C. Reicosky; D. B. Peters
Source:
Agronomy journal 1977 v.69 no.4 pp. 729-732
ISSN:
0002-1962
Subject:
evapotranspiration; portable equipment; measuring devices; equipment design; field experimentation
Abstract:
... The increased importance of water-use efficiency in agricultural production has prompted the need for new techniques to measure evapotranspiration (ET) on field plots to evaluate the effects of new soil and water management practices on plant-water use and stress. This note describes the design and performance of an inexpensive, portable chamber for rapid field measurement of ET. This chamber was ...
Handle:
10113/17648
DOI:
10.2134/agronj1977.00021962006900040051x

2. A Technique of Monitoring Acidity of Silage during Preservation and Storage

Author:
Milton A. Sprague; B. Brooks Taylor
Source:
Agronomy journal 1977 v.69 no.4 pp. 727-728
ISSN:
0002-1962
Subject:
Dactylis glomerata; acidity; butyric acid; dry matter content; early development; fermentation; forage quality; silage; storage quality
Abstract:
... Measurement of the rate of drop in pH of silage is important in research since it indicates the kind of fermentation which takes place. Ability to monitor pH changes without opening the silo permits a time-development study of agronomic factors which affect the efficiency of preservation of different kinds of forages, pH electrodes were placed within plastic silos and electrode lead wires extended ...
DOI:
10.2134/agronj1977.00021962006900040050x

3. Autumn-Accumulated Tall Fescue and Orchardgrass. I. Growth and Quality as Influenced by Nitrogen and Soil Temperature

Author:
K. A. Archer; A. M. Decker
Source:
Agronomy journal 1977 v.69 no.4 pp. 601-605
ISSN:
0002-1962
Subject:
Dactylis glomerata; Festuca arundinacea; Fragiudults; air temperature; application rate; crude protein; digestibility; environmental factors; equipment; fertilizer application; field experimentation; forage; forage yield; grasses; hay; leaves; livestock; nitrogen; nitrogen fertilizers; pastures; silage; silt loam soils; soil temperature; spring; summer; winter
Abstract:
... In many situations autumn-saved pastures offers an excellent alternative to more traditional and expensive livestock programs where hay or silage are the main winter feeds. Environmental conditions during the period of fall forage accumulation are markedly different from those of the spring and summer months and both forage yield and quality were affected. The objective of this research was to stu ...
DOI:
10.2134/agronj1977.00021962006900040019x

4. Autumn-Accumulated Tall Fescue and Orchardgrass. II. Effects of Leaf Death on Fiber Components and Quality Parameters

Author:
K. A. Archer; A. M. Decker
Source:
Agronomy journal 1977 v.69 no.4 pp. 605-609
ISSN:
0002-1962
Subject:
Dactylis glomerata; Festuca arundinacea; Fragiudults; acid detergent fiber; application rate; digestibility; equipment; field experimentation; forage quality; leaves; lignin; lignin content; neutral detergent fiber; nitrogen; pastures; silica; silt loam soils; soil temperature; summer; winter
Abstract:
... The practice of accumulating late summer and fall forage growth for winter pastures is growing. As temperatures drop in the fall, and as growth rates decline, the percentage of dead leaf material increases. The effects of reduced growth rates, and increased leaf senescence, has a pronounced effect on the quality of accumulated forage. The objective of this research was to determine the relationshi ...
DOI:
10.2134/agronj1977.00021962006900040020x

5. Barley Yields and Tissue N, P, and K with High-Low N Supply for Different Growth Periods

Author:
Michio Suzuki; L. B. MacLeod
Source:
Agronomy journal 1977 v.69 no.4 pp. 695-700
ISSN:
0002-1962
Subject:
Hordeum vulgare; NPK fertilizers; barley; grain yield; hydroponics; leaves; nutrient use efficiency
Abstract:
... Grain production with minimum use of N has been a major concern of producers. Since physiological characteristics of a barley plant having high N utilization efficiency (grain yield/supplied N) have not been fully elucidated, grain yields and chemical components of Herta barley (Horedum distichon L.) frotn hydroponic cultures with high and low N supply for different growth periods were determined. ...
DOI:
10.2134/agronj1977.00021962006900040042x

6. Effect of Root Temperatures on Growth and Cation Composition of Festuca arundinaceae Schreb.

Author:
J. E. Leggett; D. B. Egli; L. Bush
Source:
Agronomy journal 1977 v.69 no.4 pp. 723-724
ISSN:
0002-1962
Subject:
Festuca arundinacea; Lolium multiflorum; air; air temperature; ambient temperature; calcium; cations; cold season; cooling; dry matter accumulation; forage; greenhouses; hybrids; hydroponics; magnesium; nutrient solutions; potassium; roots; soil temperature
Abstract:
... The accumulation of cations by many cool season forages has been shown to be influenced by both air and soil temperature. This investigation investigated the influence of root temperature on the cation composition of a tall fescue (Festuca arundinaceae Schreb.) derived from an annual ryegrass (Lolium multiflorum L.) × tall fescue hybrid. Plants were collected from field-grown, spaced plants, trans ...
DOI:
10.2134/agronj1977.00021962006900040048x

7. Effects of Deproteinized Alfalfa Juice Applied to Alfalfa - Bromegrass, Bromegrass, and Corn

Author:
H. W. Ream; Dale Smith; R. P. Walgenbach
Source:
Agronomy journal 1977 v.69 no.4 pp. 685-689
ISSN:
0002-1962
Subject:
Bromus inermis; Medicago sativa; Zea mays; alfalfa; application rate; calcium; corn; crop production; crops; crude protein; exchangeable potassium; fertilizer application; fertilizers; field experimentation; forage; harvesting; juices; magnesium; pH; phosphorus; plant damage; pollution; protein concentrates; soil; soil fertility; United States
Abstract:
... Nutrient and dry matter losses when harvesting alfalfa (Medicago sativa L) in humid areas of the U.S. are often 15 to 30% or more. A harvesting system designed to minimize these losses, in which standing alfalfa is chopped in the field, pressed to reduce moisture, and the juice processed to extract protein, has been under investigation. When alfalfa is processed in this manner, the products are a ...
DOI:
10.2134/agronj1977.00021962006900040040x

8. Element Concentration of Forage and Non-soluble Cell Wall Fraction of Coastal Bermudagrass

Author:
J. H. Edwards; W. A. Jackson; E. R. Beaty; R. A. McCreery
Source:
Agronomy journal 1977 v.69 no.4 pp. 617-619
ISSN:
0002-1962
Subject:
Cynodon dactylon; Hapludults; animal nutrition; beef cattle; calcium; cell walls; copper; digestion; forage; iron; magnesium; manganese; potassium; sandy loam soils; sodium; zinc
Abstract:
... Elements contained in forage, the primary feed of beef cattle, are extremely important in animal nutrition. However, lack of knowledge concerning the release of elements in the forage during digestion has hampered effective research on the biological value of forage elements. The research reported here was concerned with measuring some of the major elements contained in (a) coastal bermudagrass (C ...
DOI:
10.2134/agronj1977.00021962006900040023x

9. Leaf, Petiole, and Stem Accumulation, and Digestibility in ‘Amclo’ Clover

Author:
E. R. Beaty; Albert E. Smith; John D. Powell
Source:
Agronomy journal 1977 v.69 no.4 pp. 682-684
ISSN:
0002-1962
Subject:
Paleudults; Trifolium vesiculosum; digestible dry matter; dry matter accumulation; dry matter digestibility; flowering; flowers; forage; grazing; harvest date; hay; in vitro digestibility; legumes; loamy sand soils; perennial grasses; petioles; silage; stem elongation; stems
Abstract:
... The South has long needed a high yielding legume to complement the perennial grasses of the region. ‘Amclo’ arrowleaf clover (Trifolium vesiculosum Savi) released in 1963 is high yielding and the forage is high in quality, but management required to maintain the high quality in the harvested feed is not known. We wanted to know the dry matter accumulation rate and digestibility during the active g ...
DOI:
10.2134/agronj1977.00021962006900040039x

10. Pre-sowing Seed Treatments, Seed Coats, and Metabolic Activity of Lehmann Lovegrass Seeds

Author:
Marshall R. Haferkamp; Gilbert L. Jordan; Kaoru Matsuda
Source:
Agronomy journal 1977 v.69 no.4 pp. 527-530
ISSN:
0002-1962
Subject:
Eragrostis lehmanniana; adenosine triphosphate; agronomy; air; air drying; biochemical pathways; caryopsis; germination; growth chambers; imbibition; oxygen; permeability; pretreatment; seed coat; water content
Abstract:
... Data from both field and laboratory studies have suggested germination of Lehmann lovegrass (Eragrostis lehmanniana Nees.) caryopses (seeds) can be improved by various pre-sowing seed treatments. Effective treatments include moistening and drying, oven-drying, scarification, and pre-chilling on a moist substrate. The increased germination may be due to improved seed-coat permeability or to a chang ...
DOI:
10.2134/agronj1977.00021962006900040001x

11. Regulation of Grain Yield by Photosynthesis in Maize Subjected to a Water Deficiency

Author:
H. G. McPherson; J. S. Boyer
Source:
Agronomy journal 1977 v.69 no.4 pp. 714-718
ISSN:
0002-1962
Subject:
Zea mays; corn; drought; filling period; flowering; grain crops; grain yield; growing season; leaf water potential; photosynthesis; roots; shoots; soil
Abstract:
... Since the physiological mechanisms responsible for yield losses under dry conditions are unknown, especially for grain crops, we attempted to identify them in maize (Zea mays L.) subjected" to a water deficiency during most of the grain filling period. The plants were grown in a controlled environment capable of providing yields comparable to the field. Grain yield, dry weights of shoots and roots ...
DOI:
10.2134/agronj1977.00021962006900040046x

12. Relationships Among Cottonseed Vigor and Emergence

Author:
D. R. Buxton; P. J. Melick; L. L. Patterson; E. J. Pegelow
Source:
Agronomy journal 1977 v.69 no.4 pp. 677-681
ISSN:
0002-1962
Subject:
Gossypium; cotton; cottonseed; prediction; seed germination; seed testing; seedling emergence; seedlings; soil; soil quality; temperature; viability; vigor
Abstract:
... Better predictive methods of field emergence of cotton (Gossypium spp.) seedlings are needed than are presently available. In this paper we report on two types of relationships for predicting seedling emergence. The first is the association between field emergence and a vigor term of germinating seedlings called % transfer (ratio of plant axis weight to total weight of seedlings). The second is th ...
DOI:
10.2134/agronj1977.00021962006900040038x

13. Response of Wheat Cultivars to Liming in Some High Al Oxisols of Rio Grande do Sul, Brazil

Author:
J. A. Martini; R. A. Kochhann; E. P. Gomes; F. Langer
Source:
Agronomy journal 1977 v.69 no.4 pp. 612-616
ISSN:
0002-1962
Subject:
Gaeumannomyces graminis var. graminis; Glycine max; Triticum aestivum; Udox; acid soils; aluminum; cultivars; disease incidence; exchangeable aluminum; limestone; liming; manganese; residual effects; soil pH; soil quality; toxicity; wheat; Brazil
Abstract:
... The objective of this field study was to determine the yield response of wheat (Triticum aestivum L.) to the direct and residual effects of liming in relation to variety, soil acidity, Al toxicity, P availability, and disease incidence in five Oxisols of Rio Grande do Sul, Brazil under successive wheat-soybean (Glycine max L. Merrill) cropping. This work was carried out under field conditions usin ...
DOI:
10.2134/agronj1977.00021962006900040022x

14. Root Zone pH Changes and Ion Uptake Imbalances by Triticale, Wheat, and Rye

Author:
L. M. Mugwira; S. U. Patel
Source:
Agronomy journal 1977 v.69 no.4 pp. 719-722
ISSN:
0002-1962
Subject:
Hapludults; Secale cereale; Triticosecale; Triticum aestivum; aluminum; calcium; calcium nitrate; clay loam soils; cultivars; culture media; growth chambers; ion transport; nutrient solutions; pH; potassium nitrate; protons; rhizosphere; rye; stoichiometry; subsoil; triticale; wheat; Italy
Abstract:
... Differential pH induced in growth media and the ion uptake imbalances of different cultivars are important criteria of degrees of aluminum tolerance. The objective of this study was to determine if changes in pH of nutrient solutions and soil and anion-minus-cation (A—C) uptake frem solution can be used to rank cultivars of triticale (X Triticosecale Witt Mack) of differential Al tolerance. Change ...
DOI:
10.2134/agronj1977.00021962006900040047x

15. Sampling Distribution of Nitrates in Irrigated Fields

Author:
J. O. Reuss; P. N. Soltanpour; A. E. Ludwick
Source:
Agronomy journal 1977 v.69 no.4 pp. 588-592
ISSN:
0002-1962
Subject:
confidence interval; farmers; irrigated farming; lognormal distribution; nitrates; normal distribution; regression analysis; soil; standard deviation; variance; Colorado; Nebraska
Abstract:
... The object of this study was to determine the components of variability encountered in sampling farmers' fields for soil nitrates. This information is required for formulating recomendations for sampling plan and intensity. Twenty-four irrigated farm fields in northeastern Colorado and Western Nebraska were sampled on 61 ✕ 61 m grids. One soil core was taken in 30-cm increments from each grid to a ...
DOI:
10.2134/agronj1977.00021962006900040016x

16. Sources, Rates, and Frequencies of N Application in Subirrigated Hay Meadow

Author:
L. A. Daigger; W. J. Moline
Source:
Agronomy journal 1977 v.69 no.4 pp. 644-647
ISSN:
0002-1962
Subject:
Agropyron; Carex; Poa; Sorghastrum; Ustifluvents; ammonium nitrate; application rate; hay; meadows; protein content; protein synthesis; soil nutrients; spring; subsurface irrigation; sulfur-coated urea; urea
Abstract:
... Inadequate supplies of soil nutrients often limits hay production of western U. S. subirrigated meadows. Our purpose was to evaluate the effectiveness of three N-sources at various rates in alternating sequences of N-applied annually, biennially, and triennially for meadow hay production. The hay consisted of a complex mixture of Agropyron, Poa, Sorghastrum, and Carex species harvested from a subi ...
DOI:
10.2134/agronj1977.00021962006900040031x

17. Temperature and Oxygen Effects in Soil on Nutrient Uptake in Jojoba Seedlings

Author:
D. M. Reyes; L. H. Stolzy; C. K. Labanauskas
Source:
Agronomy journal 1977 v.69 no.4 pp. 647-650
ISSN:
0002-1962
Subject:
Simmondsia chinensis; calcium; greenhouses; iron; jojoba; leaves; magnesium; manganese; nitrogen; nitrogen content; nutrient content; nutrient uptake; nutrients; oxygen; phosphorus; potassium; roots; seedlings; seeds; shrubs; sodium; soil temperature; stems; tanks; zinc
Abstract:
... Jojoba (Simmondsia chinensis), a woody shrub, produces seeds which have several potential uses. The objectives of this experiment were to study the effects of soil temperature and soil oxygen supply on the nutrient uptake of the jojoba plant. Presently, there is little information on effect of soil physical factors on plant nutrients. The study was conducted in a greenhouse with constant temperatu ...
DOI:
10.2134/agronj1977.00021962006900040032x

18. Yield and Leaf Nitrogen of Nodulating and Nonnodulating Soybeans as Affected by Nitrogen and Molybdenum

Author:
M. B. Parker; H. B. Harris
Source:
Agronomy journal 1977 v.69 no.4 pp. 551-554
ISSN:
0002-1962
Subject:
Glycine max; Hapludults; Rhodudults; acid soils; cultivars; isogenic lines; leaves; molybdenum; nitrate reduction; nitrogen; pH; plant response; soybeans; symbiosis
Abstract:
... Investigators have suggested that soybean [Glycine max (L.) Merr.] response to Mo was essentially a correction of N deficiency, and a series of experiments was conducted on acid soils (pH ranged from 4.5 to 5.6) to evaluate the suggestion. In the first series of experiments, yield response to Mo and N rates was studied for 3 years on soybean cultivars grown on Dyke 1 (Typic Rhodudult) and State 1 ...
DOI:
10.2134/agronj1977.00021962006900040007x

19. A Simple Laboratory Approach to Test and Estimate Seed Germination Performance under Field Conditions

Author:
A. Hadas
Source:
Agronomy journal 1977 v.69 no.4 pp. 582-588
ISSN:
0002-1962
Subject:
Vicia; agronomy; chickpeas; osmotic pressure; peas; polyethylene glycol; seed germination
Abstract:
... A simple laboratory procedure for testing seed germination under simulated field conditions, and the utilization of these data in predicting the seed's performance under field conditions is presented. Sorghum, pea, chickpea, and vetch seeds were germinated in P.E.G. (polyethyleneglycol) solutions of different osmotic potential levels in the laboratory. The collected data were used to predict germi ...
DOI:
10.2134/agronj1977.00021962006900040015x

20. Alterations of Yield, Test Weight, and Protein in Lodged Grain Sorghum

Author:
Jeffrey C. Larson; Jerry W. Maranville
Source:
Agronomy journal 1977 v.69 no.4 pp. 629-630
ISSN:
0002-1962
Subject:
plant damage
Abstract:
... Lodging can he a detriment to yield anal quality of grain sorghum (Sorghum bicolor (L.) Moench). However, the magnitude of the changes which occur in yield and quality has not been determined. An experiment was conducted to measure the alteration in yield, protein, and test weight of this crop by artificially simulating two types of lodging observed to occur naturally in the field. Plants were man ...
DOI:
10.2134/agronj1977.00021962006900040027x