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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 before receiving P generally had higher values of Pu and predicted P uptake than 10‐days even where no CaO was added. In addition, Pu and predicted P uptake decreased with reaction time after P addition, showing a rapid decline within 25 days, followed by a slower reaction.
Notes
Dept. of Soil Sci. National Chung Hsing Univ., Taichung, Taiwan 40227.
Dept. of Agron., Purdue Univ., West Lafayette, IN 47907–7899.
Journal Paper No. 12540 of the Purdue Univ. Agric. Exp. Stn., West Lafayette, IN 47907.