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You searched for: Journal name Agronomy journal Remove constraint Journal name: Agronomy journal Publication Year 1975 Remove constraint Publication Year: 1975
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1. 15N-Labelled Single-treatment Fertility Experiments

Author:
M. Fried; R. J. Soper; H. Broeshart
Source:
Agronomy journal 1975 v.67 no.3 pp. 393-396
ISSN:
0002-1962
Subject:
Oryza sativa; Triticum aestivum; Zea mays; ammonium; ammonium nitrogen; corn; developmental stages; fertilizer application; field experimentation; isotope labeling; nitrates; nitrogen fertilizers; nutrient uptake; quantitative analysis; rice; soil; stable isotopes; wheat
Abstract:
... There is only one way of measuring directly the uptake of nutrient from applied fertilizer as affected by timing, placement, fertilizer source, and environmental interactions. This is by isotope labelling of the fertilizer. The purpose of the present study is not only to demonstrate the effectiveness of this technique in field experiments, but to extend the technique to the direct measurement of t ...
DOI:
10.2134/agronj1975.00021962006700030028x

2. Advection Modification of the Priestley and Taylor Evapotranspiration Formula

Author:
W. A. Jury; C. B. Tanner
Source:
Agronomy journal 1975 v.67 no.6 pp. 840-842
ISSN:
0002-1962
Subject:
Medicago sativa; advection; air temperature; alfalfa; evapotranspiration; irrigation; models; net radiation; potatoes
Abstract:
... The empirical formula of Priestly and Taylor (1972) relating the evapotranspiration from a well-watered surface to the net radiation and a function of the air temperature is modified to include a saturation deficit term to account for high local advection. The model is tested on two seasons of daily evapotranspiration measurements over irrigated potatoes (Solarium tuberosum L.), resulting in good ...
DOI:
10.2134/agronj1975.00021962006700060031x

3. Alfalfa Flower Color Associated with Differential Seed Set by Leaf-cutter Bees

Author:
B. P. Goplen; S. A. Brandt
Source:
Agronomy journal 1975 v.67 no.6 pp. 804-806
ISSN:
0002-1962
Subject:
Medicago sativa; Megachile rotundata; alfalfa; bees; florets; flower color; flowering; pods; pollination; racemes; seed set; seed weight; seed yield; seeds
Abstract:
... Many studies have been carried out to demonstrate that alfalfa (Medicago sativa L.) plants vary in their attractiveness to bees. Flower color has often been implicated as one of the factors in attractiveness, but the reports are conflicting and inconclusive. Field observations by the authors indicated that yellow flowered alfalfa plants were tripped less frequently and set less seed than the commo ...
DOI:
10.2134/agronj1975.00021962006700060019x

4. Amino Acid and Elemental Composition of Sunflower and Pumpkin Seeds

Author:
R. G. Robinson
Source:
Agronomy journal 1975 v.67 no.4 pp. 541-544
ISSN:
0002-1962
Subject:
Calciaquolls; Cucurbita pepo; Hapludolls; Helianthus annuus; Kjeldahl method; amino acids; calcium; crops; cultivars; elemental composition; nitrogen; nutritive value; oils; pericarp; protein content; proteins; pumpkins; seeds; snacks; sodium; sunflower seed; Minnesota
Abstract:
... The research was undertaken because knowledge of the amino acid and elemental composition of sunflower (Helianthus annnus L.) and pumpkin (Cucurbita pepo L) seeds is meager and incomplete. Yet, in contrast to their present use as snacks, both species are widely-adapted crops of potential use for staple human food. Seeds of the two species were evaluated as foods, to meet major protein and mineral ...
DOI:
10.2134/agronj1975.00021962006700040022x

5. Availability of Water Absorbed by Hardwood Bark Soil Amendment

Author:
L. Art Spomer
Source:
Agronomy journal 1975 v.67 no.4 pp. 589-590
ISSN:
0002-1962
Subject:
Acer rubrum; Fraxinus americana; Juglans nigra; Platanus occidentalis; Populus; Quercus alba; Quercus rubra; bark; hardwood; soil amendments; water content; water potential
Abstract:
... This laboratory investigation determined the ‘availability’ of water absorbed by hardwood bark soil amendment. Water retention isotherms on a volumetric basis were determined on bark samples of seven different species (Fraxinus americana L., Populus deltioides Bartr., Acer rubrum L., Quercus rubra L., Platanus occidentalis L., Juglans nigra L., and Quercus alba L.) with a water pycnometer and a th ...
DOI:
10.2134/agronj1975.00021962006700040039x

6. Boron Application for Corn Grown on Selected Southeastern Soils

Author:
J. T. Touchton; F. C. Boswell
Source:
Agronomy journal 1975 v.67 no.2 pp. 197-200
ISSN:
0002-1962
Subject:
Zea mays; aluminum; application rate; barium; boron; calcium; coastal plains; copper; corn; crude protein; field experimentation; foliar spraying; iron; leaves; magnesium; manganese; piedmont soils; plant growth; plant tissues; potassium; sodium; strontium; zinc
Abstract:
... Some southeastern states recommend Boron application or Corn (Zea mays L.) while others with similar soils, do not. Certain soils are capable of providing an adequate supply of B for plant growth; others are not and require additional B. This study was initiated to determine the effects of B application to corn grown on two Coastal Plain and one Piedmont soil. The objectives were to investigate B ...
DOI:
10.2134/agronj1975.00021962006700020006x

7. Boron Source and Lime Effects on the Yield of Three Crops Grown in Peat

Author:
M. Prasad; E. Byrne
Source:
Agronomy journal 1975 v.67 no.4 pp. 553-556
ISSN:
0002-1962
Subject:
Solanum lycopersicum var. lycopersicum; Zea mays; boron; corn; crop yield; crops; cucumbers; greenhouse experimentation; mineral soils; peat; peat soils; sodium borate; sweetcorn; tomatoes; toxicity; water solubility
Abstract:
... The necessity of adding B in peat soils is recognized. A limited amount of information is available regarding toxic levels of B in these soils. A greenhouse experiment was therefore carried out to measure effects of three levels of lime × four levels of B (including control) × two types of B source on tomato (Lycopersicon esculentum Mill cv. Eurocross BB), cucumber (Curcumis sativus L. cv. Sporu), ...
DOI:
10.2134/agronj1975.00021962006700040025x

8. Broadleaf Weed Control in Dormant Bermudagrass Turf

Author:
B. J. Johnson
Source:
Agronomy journal 1975 v.67 no.5 pp. 689-692
ISSN:
0002-1962
Subject:
2,4-D; Alchemilla; Cynodon dactylon; Hapludults; Lamium amplexicaule; Rhodudults; Stellaria media; Veronica; broadleaf weeds; cisanilide; corn; dicamba; lawns and turf; mecoprop; methazole; paraquat; pesticide application; propionic acid; silvex; turf grasses; weed control; winter
Abstract:
... Broadleaf weeds continue to be a major problem in turfgrass during mild winters throughout the Southeast. Therefore, experiments were conducted with herbicides applied postemergence to determine the maximum weed control with the least amount of chemical treatment. Two new herbicides alone with presently available chemicals were applied to dormant bermudagrass [Cynodon dactylon L. Pers.] in singly ...
DOI:
10.2134/agronj1975.00021962006700050027x

9. Calculation of Rate of Nutrient Uptake by Growing Roots

Author:
F. E. Khasawneh
Source:
Agronomy journal 1975 v.67 no.4 pp. 574-576
ISSN:
0002-1962
Subject:
equations; frequency distribution; nutrient uptake; root systems; roots; time series analysis
Abstract:
... Equations are presently available to calculate the rate of nutrient uptake by growing roots. They can be used to estimate an average rate of uptake by the entire root system, but they fail to give specific information on uptake by a unit segment of root or on the effects of aging and morphological changes of such a segment on its capacity for uptake. This paper gives a theoretical analysis of the ...
DOI:
10.2134/agronj1975.00021962006700040032x

10. Cannabinoid Profile and Elemental Uptake of Cannabis sativa L. as Influenced by Soil Characteristics

Author:
C. B. Coffman; W. A. Gentner
Source:
Agronomy journal 1975 v.67 no.4 pp. 491-497
ISSN:
0002-1962
Subject:
Cannabis sativa; cannabidiol; chemical analysis; greenhouses; harvesting; leaf analysis; leaves; phosphorus pentoxide; plant height; product authenticity; provenance; soil pH; tetrahydrocannabinol; traffic
Abstract:
... The consumption of Cannabis products (marihuana) derived from domestic and foreign sources persists in the United States despite its illegality and health hazards. The objectives of this investigation were: 1) to evaluate relationships between soil and plant elements, cannabinoids, and growth of Cannabis sativa L., and 2) to evaluate the practicality of using chemical analysis of Cannabis products ...
DOI:
10.2134/agronj1975.00021962006700040010x

11. Cation Concentrations and K to CA + MG Ratio of Nine Cool-Season Grasses and Implications with Hypomagnesaemia

Author:
James L. Thill; J. R. George
Source:
Agronomy journal 1975 v.67 no.1 pp. 89-91
ISSN:
0002-1962
Subject:
Agropyron cristatum; Alopecurus pratensis; Arrhenatherum elatius; Bromus inermis; Dactylis glomerata; Elymus canadensis; Phalaris arundinacea; Poa pratensis; Thinopyrum elongatum; air temperature; calcium; cold season; cool season grasses; forage grasses; grass tetany; grazing; livestock; magnesium; nutrient deficiencies; pastures; potassium; risk; ruminants; spring
Abstract:
... Reports of hypomagnesaemia, a Mg deficiency in ruminants, occur most frequently when livestock graze the spring growth of grass pastures. To minimize these animal losses it is important to know whether differences exist among forage grasses for potential risk of Mg deficiency in ruminant livestock. The objectives of this study were 1) to determine if several cool-season forage grasses accumulate K ...
DOI:
10.2134/agronj1975.00021962006700010025x

12. Cation-Anion Balance of Field-Grown Crops. I. Effect of Nitrogen Fertilization

Author:
W. L. Banwart; W. H. Pierre
Source:
Agronomy journal 1975 v.67 no.1 pp. 14-19
ISSN:
0002-1962
Subject:
Avena sativa; Dactylis glomerata; Zea mays; acidity; anions; corn; crops; fertilizer application; field experimentation; leaves; nitrates; nitrification; nitrogen; nitrogen content; nitrogen fertilizers; oats; potassium fertilizers; soil types
Abstract:
... Plant species differ in their cation-anion balance, but there are rather substantial variations in the contents of organic anions (C–A) and excess–base (EB), and in the EB/N ratio of plants of a given species when grown under widely different conditions. The causes of such variation within a species are of interest because of the relationship of the C–A in plants to crop growth and the effect of t ...
DOI:
10.2134/agronj1975.00021962006700010005x

13. Cation-Anion Balance of Field-Grown Crops. II. Effect of P and K Fertilization and Soil pH

Author:
W. L. Banwart; W. H. Pierre
Source:
Agronomy journal 1975 v.67 no.1 pp. 20-25
ISSN:
0002-1962
Subject:
Avena sativa; Medicago sativa; Zea mays; alfalfa; corn; crop yield; crops; environmental factors; fertilizer application; field experimentation; leaves; limestone; nitrogen fertilizers; oats; phosphorus; phosphorus fertilizers; potassium fertilizers; soil pH
Abstract:
... Plant species differ in their cation-anion balance, but the organic anion content (C-A), excess-base (EB), and EB/N ratio of a given plant species may vary cansiderably when grown under different environmental conditions. Nitrogen fertilizers, for example, increase the organic anion content of certain crop plants and alter their effect on soil acidity by reducing the EB/N ratio. The primary object ...
DOI:
10.2134/agronj1975.00021962006700010006x

14. Changes in Nutritive Value of Siratro Forage with Age

Author:
Lotar Siewerdt; Ethan C. Holt
Source:
Agronomy journal 1975 v.67 no.4 pp. 544-546
ISSN:
0002-1962
Subject:
Haplustolls; Macroptilium atropurpureum; crude protein; digestible dry matter; legumes; nutritive value; petioles; plant age; stems; tropical grasses
Abstract:
... Nutritive value characteristics are not as well documented for tropical legumes as for temperate legumes and grasses. ‘Siratro’ (Phaseolus atropurpureus D.C.), a tropical legume, was grown under field conditions in soil classified as a udertic haplustoll with adequate moisture, to determine its nutritive value as affected by plant age. Plant samples, harvested at the ground level every 2 weeks, be ...
DOI:
10.2134/agronj1975.00021962006700040023x

15. Changes of Multispectral Soils Patterns with Increasing Crop Canopy

Author:
S. J. Kristof; M. F. Baumgardner
Source:
Agronomy journal 1975 v.67 no.3 pp. 317-321
ISSN:
0002-1962
Subject:
Zea mays; aerial photography; canopy; corn; information processing; leaf blight; photographs; planting; reflectance; scanners; soil; sowing; wavelengths
Abstract:
... Computer-aided data processing techniques were used to analyze multispectral data in order to map surface soil patterns and to follow the changes in multispectral radiation from a field of maize (Zea mays L.) during a period from seeding to maturity. Panchromatic aerial photography was obtained before planting. Multispectral scanner missions were flown both before planting and on several dates aft ...
DOI:
10.2134/agronj1975.00021962006700030009x

16. Cold Hardening and Carbohydrate Composition of Meyer Zoysia

Author:
R. A. Rogers; J. H. Dunn; C. J. Nelson
Source:
Agronomy journal 1975 v.67 no.6 pp. 836-838
ISSN:
0002-1962
Subject:
Zoysia japonica; autumn; carbohydrate composition; cold tolerance; reducing sugars; rhizomes; starch; temperature; turf grasses; winter
Abstract:
... There are few reports on cold hardening in warmseason turfgrass species. The purpose of our study was to measure changes in cold hardiness and carbohydrate composition of Zoysia japonica Steud ‘Meyer’ turfgrass during fall and winter. Both rhizome and stolon tissue developed comparable levels of cold hardiness as measured by an artificial freeze test. A significant (P <; 0.05) reduction in percent ...
DOI:
10.2134/agronj1975.00021962006700060029x

17. Combined Effects of Low Oxygen and Salinity on Germination of a Semi-dwarf Mexican Wheat

Author:
Everardo Aceves-N; L. H. Stolzy; G. R. Mehuys
Source:
Agronomy journal 1975 v.67 no.4 pp. 530-532
ISSN:
0002-1962
Subject:
Inia; Triticum aestivum; aeration; analysis of variance; growth chambers; irrigated soils; osmotic pressure; oxygen; prediction; saline soils; salinity; salt stress; seed germination; seeds; wheat
Abstract:
... The simultaneous occurrence of low oxygen and high salinity conditions is common in a wide range of irrigated soils. The combined effects of O₂ and osmotic potential stresses on germination of wheat (Triticum aestivum L. ‘Inia 66’) were tested under growth chamber conditions. A range of O₂ concentrations and salinity levels were chosen to simulate soil aeration and salinity combinations that might ...
DOI:
10.2134/agronj1975.00021962006700040019x

18. Compatibility of Rhizobium japonicum with Chemical Seed Protectants

Author:
R. L. Curley; J. C. Burton
Source:
Agronomy journal 1975 v.67 no.6 pp. 807-808
ISSN:
0002-1962
Subject:
Bradyrhizobium japonicum; Glycine max; Rhizobium; adverse effects; bacteria; captan; carboxin; growth chambers; nodulation; organic sulfur compounds; planting; plate count; quantitative analysis; quintozene; seed treatment; seeds; soybeans; tap roots; thiram; toxicity
Abstract:
... The literature on the compatibility of Rhizobium sp. with seed protectant chemicals is controversial because of variation in methods and the lack of quantitative data. The present study was planned to develop a reliable quantitative method of measuring compatibility of Rhizobium japonicum with seed-applied fungicides. The effect of four seed protectant chemicals on survival of R. japonicum on soyb ...
DOI:
10.2134/agronj1975.00021962006700060020x

19. Corn Hybrid Yield Effects on Phosphorus, Manganese, and Zinc Absorption

Author:
G. L. Terman; P. M. Giordano; N. W. Christensen
Source:
Agronomy journal 1975 v.67 no.2 pp. 182-184
ISSN:
0002-1962
Subject:
Zea mays; application rate; corn; cultivars; grain yield; greenhouse experimentation; manganese; nutrient content; nutrient uptake; nutrients; phosphorus; planting; soil nutrients; total phosphorus; zinc
Abstract:
... Researchers have concluded in several published papers that differences in nutrient absorption among crop cultivars are genetically controlled. However, growth rate and yield differences among cultivars were not usually evaluated. The present investigation involved three greenhouse experiments conducted to study relationships between yield levels and concentrations of P, Mn, and Zn in several corn ...
DOI:
10.2134/agronj1975.00021962006700020002x

20. Corn Yield and Nutrient Uptake as Affected by Water-Table Depth and Soil Submergence

Author:
T. N. Chaudhary; V. K. Bhatnagar; S. S. Prihar
Source:
Agronomy journal 1975 v.67 no.6 pp. 745-749
ISSN:
0002-1962
Subject:
NPK fertilizers; corn; crops; drainage; equations; grain yield; groundwater; growing season; irrigation; irrigation water; nutrient uptake; oxygen; rain; regression analysis; rhizosphere; silt loam soils; soil water; stover; submergence; water table
Abstract:
... Crops are affected by fluctuations in the water table by seasonal rainfall and soil submergence during growth. A better understanding of their response will help us to optimize drainage and irrigation. Response of irrigated corn to (i) four static water-table depths (60, 90, 120, and 150 cm) as affected by the growing-season rainfall and (ii) single or repeated submergence for 1 to 6 days was stud ...
DOI:
10.2134/agronj1975.00021962006700060004x