Abstract
Abstract The efficiency of applied P fertilizer is usually low and declines with time after P addition. It also may be affected by soil pH. We investigated effects of aging and soil pH on P uptake with a mechanistic nutrient uptake model. The uptake model uses both solution P (Pli) and resin‐exchange P (Psi) in determining soil P supply to the root. Effect of aging of lime and P addition may have separate effects on Pli, Psi and predicted P uptake. A 5x2x4x4 factorial experiment with five levels of soil pH (4.6, 5.8, 6.9, 7.6, and 8.2) with two incubation times of pH adjustment (10 and 40 days before P application) and four different reaction times after P addition (4, 25, 72, and 140 days) of four rates of P (0, 175, 350, and 525 mg P/kg) was conducted with a sample of Rarden (clayed, mixed, mesic Aquic Hapludults) soil to evaluate the aging effect of pH adjustment, soil pH, and P addition on Pu, Psi, and predicted P uptake using the Barber‐Cushman nutrient uptake model. The incubation time of 40 days be...
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