Title:	Phosphorus management in Humid Tropical Oxisols.
Authors:	SMYTH, T. J. CRAVO, M. da S. BASTOS, J. B. LE MARE, P.
Affiliation:	THOMAS JOT SMYTH, N.C. STATE UNIVERSITY; MANOEL DA SILVA CRAVO, UEPAE DE MANAUS; JOAQUIM BRAGA BASTOS, UEPAE DE MANAUS; P. LE MARE, READING UNIVERSITY.
Date Issued:	1987
Citation:	In: CAUDLE, N. (ed.). Tropsoils technical report 1985-1986. Raleigh: North Carolina State University, 1987.
Pages:	p. 94-97.
Description:	Phosphorus deficiency is common in Oxisols of the Brazilian Amazon. For c1ayey Oxisols, P fertilization could become an important economic factor, as their P sorption capacities are high, in the same range as those in Oxisols of the Cerrado region. Although several studies have demonstrated marked yield responses to P fertilization with annual crops on these soils, information has been needed on soil-test calibrations and the long-term effects of different strategies for P fertilization. The objectives of this project were: 1) to obtain detailed P response curves and soil-test calibration data for the main annual crops cultivated in the region; 2) to obtain a description of the residual P fertilizer value, and 3) to provide indications of appropriate maintenance P fertilizer rates for sustaining adequate crop yields.
Thesagro:	Solo
Type of Material:	Parte de livro
Access:	openAccess
Appears in Collections:	Capítulo em livro técnico (CPAA)