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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Olson et al. (1958) studied this question.