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Smyth, T.J.

Aluminum and calcium constraints to continuous crop production in a Brazilian Amazon Oxisol - 1992 - Printed

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Acidity constraints in Oxisols of the Amazon may entail both Al toxicity and Ca deficiDEy. A field study was conducted in a Xanthic Hapludox near Manaus, Brazil, to evaluate lime and Ca requirements for corn (Zea mays L.), cowpea (Vigna unguiculata L.), soybean [Glycine max (L.) Merr.], and peanut (Arachis hypogea L.) during five consecutive years. Calcitic lime was applied once at rates of 0, 0.6, 1.2, 2.3, and 4.6 t of CaCO3 equivalent per hectare. The effects of 1 t ha-1 of gypsum, applied to four crops, were evaluated with lime rates of 0, 1.2 and 2.3 t ha-1. During the two initial years, maximum yields of corn and soybean occurred with 1.2 t of


English

ISSN: 0002-1962

Subjects--Topical Terms:
Alkaline earth metals
America
Arachis
Chemicophysical properties
Crop husbandry
Elements
Fertilizing
Genetic soil types
Glycine genus
Gramineae
Latin America
Leguminosae
Metallic elements
Minerals
Papilionoideae
Soil amendments
Soil types
South America
Toxicity
Vigna
Zea
Soil fertility

Dewey Class. No.: 93-063733