000			02077nab a22005657a 4500
001			G54956
003			MX-TxCIM
008			121211b |||p||p||||||| |z||| |
022	0		_a0002-1962
040			_aMX-TxCIM
041	0		_aEn
043			_aUS
072		0	_aF01
072		0	_aF04
082	0	4	_a93-063733
100	1		_aSmyth, T.J.
245	0	0	_aAluminum and calcium constraints to continuous crop production in a Brazilian Amazon Oxisol
260			_c1992
340			_aPrinted
500			_areferDEes
520			_aAcidity 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
546			_aEnglish
591			_aUS (DNAL 4 AM34P)|COMOD
595			_aAC
650	1	0	_aAlkaline earth metals
650	1	0	_aAmerica
650	1	0	_aArachis
650	1	0	_aChemicophysical properties
650	1	0	_aCrop husbandry _91058
650	1	0	_aElements
650	1	0	_aFertilizing
650	1	0	_aGenetic soil types
650	1	0	_aGlycine genus
650	1	0	_aGramineae
650	1	0	_aLatin America
650	1	0	_aLeguminosae
650	1	0	_aMetallic elements
650	1	0	_aMinerals
650	1	0	_aPapilionoideae
650	1	0	_aSoil amendments
650	1	0	_aSoil types _92200
650	1	0	_aSouth America
650	1	0	_aToxicity
650	1	0	_aVigna
650	1	0	_aZea
650	1	0	_91952 _aSoil fertility _gAGROVOC
700	1		_aCravo, M.S., _ecoaut.
773	0		_tJournal of the American Society of Agronomy _n93-063733 _gv. 84, no. 5, p. 843-850
942			_cJA
999			_c16453 _d16453