TY  - JA
AU  - Smyth,T.J.
AU  - Cravo,M.S.
TI  - Aluminum and calcium constraints to continuous crop production in a Brazilian Amazon Oxisol
SN  - 0002-1962
U1  - 93-063733 
PY  - 1992///
KW  - Alkaline earth metals
KW  - America
KW  - Arachis
KW  - Chemicophysical properties
KW  - Crop husbandry
KW  - Elements
KW  - Fertilizing
KW  - Genetic soil types
KW  - Glycine genus
KW  - Gramineae
KW  - Latin America
KW  - Leguminosae
KW  - Metallic elements
KW  - Minerals
KW  - Papilionoideae
KW  - Soil amendments
KW  - Soil types
KW  - South America
KW  - Toxicity
KW  - Vigna
KW  - Zea
KW  - Soil fertility
KW  - AGROVOC
N1  - referDEes
N2  - 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
T2  - Journal of the American Society of Agronomy
ER  -