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Phosphorus Supplying Capacities of Previously Heavily Fertilized Soils¹

ABSTRACT

Four Coastal Plain soils and one Piedmont soil heavily fertilized in the past were intensively cropped in greenhouse pots to determine changes in extractable soil P as measured by North Carolina, Bray I and Olsen extractants. Slopes relating changes in extractable P with P removed by cropping were very similar for the three sandy soils. Changes in extractable P with the North Carolina and Bray I extractants were correlated with P buffer capacity, % clay, and soil surface area. The principal source of P removed by cropping was NH₄F-P in sandy Coastal Plain soils; NH₄F-P and NaOH-P supplied equal amounts in the clayey Piedmont soil. Sandy Coastal Plain soils which originally contained more than 74 ppm North Carolina extractable P and 71 ppm Bray I extractable P supplied 82 to 108 kg P/ha to nine crops of pearl millet (Pennisetum americanum, cv. Gahi-1).

¹ Paper number 5632 of the Journal Series of the North Carolina Agricultural Exp. Stn., Raleigh, NC 27611.

² Former graduate student (now assistant professor of soils, Universidade Federal de Vicosa, Brazil) and professor of Soil science, respectively.

Received for publication May 25, 1978. Accepted for publication August 21, 1978.

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