Increased P application to lateritic soil in 1976 increased Colwell soil test P for P applied in 2000

Author:

Bolland M. D. A.,Allen D. G.

Abstract

In a field experiment, 6 amounts of superphosphate [0–800 kg phosphorus (P)/ha] were applied in July 2000 to an acidic lateritic ironstone gravel sandy soil treated 24 years previously (May 1976) with 6 amounts of superphosphate (0–599 kg P/ha). In October 2001, samples of the top 10 cm of soil were collected to measure the capacity of the soil to sorb P by the phosphate retention index (PRI) and P buffer capacity (PBC) methods, and to measure soil test P by the Colwell (sodium bicarbonate) procedure. The capacity of the soil to sorb P, as measured by both PRI and PBC, decreased with increased P application in 1976. For all amounts of P applied in 2000, Colwell soil test P increased with increased P application in 1976. We conclude that increasing amounts of P applied in 1976 decreased the capacity of the soil to sorb the subsequent application of P, thereby increasing soil test P values of soil treated with the subsequent P.

Publisher

CSIRO Publishing

Subject

Earth-Surface Processes,Soil Science,Environmental Science (miscellaneous)

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