Abstract
Synopsis Laboratory testing and field trials of fertilizers have established the important Nebraska soil series in definite categories with regard to pH, K and P status. Rather close correlation of subsoil nutrient status with that of the topsoil was noted. Thus little advantage would be expected from subsoil testing for annual crops. Fertilizer yield response data for small grains in the case of phosphorus verified the laboratory observations.
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Claims 4
Claim · model-written summary
Subsoil nutrient status was closely correlated with topsoil nutrient status.
Verbatim
e1“Rather close correlation of subsoil nutrient status with that of the topsoil was noted”
e3“Fertilizer yield response data for small grains in the case of phosphorus verified the laboratory observations”
Claim · model-written summary
Little advantage is expected from subsoil testing for annual crops.
Verbatim
e2“little advantage would be expected from subsoil testing for annual crops”
Claim · model-written summary
Nebraska soil series were established in definite categories with regard to pH, K and P status.
Verbatim
e4“Laboratory testing and field trials of fertilizers have established the important Nebraska soil series in definite categories with regard to pH, K and P status”
e3“Fertilizer yield response data for small grains in the case of phosphorus verified the laboratory observations”
Claim · model-written summary
Phosphorus fertilizer yield response data for small grains verified the laboratory observations.
Verbatim
e3“Fertilizer yield response data for small grains in the case of phosphorus verified the laboratory observations”