American Society of Agronomy, 1954 - Agriculture
Includes abstracts of the annual meetings of the American Society of Agronomy; Soil Science Society of America; Crop Science Society of America ( - of its Agronomic Education Division).
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acid Agricultural Experiment Station Agricultural Research Service alfalfa ammonium amount analysis application areas Bermudagrass birdsfoot trefoil calcium cation chemical clay College corn correlation crop crosses decreased depth determined developed dry matter effect evaluated exchangeable extracted factors field forage gene genetic germination grain grass grazing greenhouse grown growth harvest horizons hybrids inbred inches increased indicate Iowa Iowa State College irrigation kaolinite Ladino leaf legume levels lime loam material measured method mineral mixtures montmorillonite nitrate nitrification nitrogen nutrient oats obtained organic matter pasture percent percentage phosphate phosphorus plants plots Podzolic potassium pounds per acre production progenies protein Purdue University range ratio residual resistance response root samples seed seedlings significant silt loam sodium soil moisture soluble solution soybeans species subsoil superphosphate surface temperature tests treatments University uptake USDA USDA Agricultural Research values varieties vermiculite wheat yield