Nutrient absorption characteristics of resin capsules for the photoavailability soil test (PST) in four Arkansas soils

Abstract

Abstract Mixed‐bed resin capsules were placed in four Arkansas soils in a fertilizer rate study utilizing greenhouse pots. The capsules were removed at 2,10, 21, and 35 days. The nutrient content of both the capsules and soybean shoots were determined. Generally for each soil significant differences in plant nutrient content occurred due to both time (T) and phosphorus (P) and potassium (K) fertilizer rate (R) but not due to the T x R interaction. The resin content of the major‐ and micro‐nutrients increased as time of soil contact increased. However the fertilizer rate increase did not increase the resin content of the micronutrients with time but did affect the resin content of the major nutrients with time. Statistical analyses indicated significant but negative values for P and sulfur (S) when correlating resin content with final plant update data. While there were positive values for the major cations the values were usually below 0.50 when correlating resin content with final plant update.