The residual phosphorus,potassium, chlorides and other salts in soils following five years of fertility studies

Abstract

Soil samples were taken from six experimental sites (3 in phosphorus and 3 in the potassium rate studies) to depths of 60 or 90 cm. Phosphorus from the various rates of applied P was found to have accumulated in the surface soil except where mechanical mixing was suspected. Potassium from the various rates of applied K was found accumulated in soil depths of 0 to 20 cm. However, the accumulated amounts of P and K were small in comparison to the rates applied. In the potassium studies, chlorides accumulated in the subsoils of the two sites that had restricted soil layers.