Title:	Potential productivity and nitrogen-use efficiency of corn and rice in várzeas: M-910C.
Authors:	MELGAR, R. J. SANCHEZ, P. A. SMYTH, T. J. CRAVO, M. da S.
Affiliation:	RICARDO J. MELGAR, N.C. STATE UNIVERSITY; P. A. SANCHEZ, N.C. STATE UNIVERSITY; THOMAS JOT SMYTH, N.C. STATE UNIVERSITY; MANOEL DA SILVA CRAVO, UEPAE DE MANAUS.
Date Issued:	1991
Citation:	In: McBRIDE, T. P. (Ed.). Tropsoils technical report, 1988-1989. Raleigh: North Carolina State University, 1991.
Pages:	p. 278-281.
Description:	Alluvial soils along the white water rivers; locally known as várzeas, are a major land resource in the Amazon basin. The state of Amazonas in Brazil has about 25 million hectares of such soils. Their high base status, adequate water supply, and eight-month flood-free period provide appropriate conditions for intensive food production in a region dominated by low fertility Oxisols and Ultisols. Total soil N is low in many of these soils, suggesting a potential nutrient deficiency. Yield response to N has been noted to increase during successive com crops in várzea soils. This response would be magnified with the use of improved, high yielding varieties.
Thesagro:	Solo Arroz
Type of Material:	Parte de livro
Access:	openAccess
Appears in Collections:	Capítulo em livro técnico (CPAA)