000			021480000a22006130004500
901			_aP35
902			_aE11
903			_aE
903			_aV
904			_aBCO
905			_aC
908			_aJ
909			_aAS
912			_aEn
912			_aEn
914			_aFORES
914			_aRIBRE
914			_aSILVI
914			_aKE
082	0	4	_a12152
100	1		_944335 _aArnason, T.
100	1		_984704 _aLambert, J.D.H.
100	1		_969777 _aGale, J.
100	1		_952729 _aCal, J.
100	1		_9128524 _aVernon, H.
260			_c1982
041	0		_aEn
500			_a2 fig. 4 tab. 24 ref. Sum. (En)
520			_aIntensification of land use by shifting Maya agriculturists in Belize, Central America, has led to a decline in soil fertility and crop yields. Examination of eleven nutrients in crop plants and soil, and changes in nutrient levels with the lenght of the cropping period, indicated that phosphorus was the limiting factor for plant growth. Physical analyses of the soil and visual evidence suggested that erosion is a contributing factor to declining soil quality. A variety of solutions to the infertility problem are discussed
650	1	4	_9143131 _aCULTIVO MIGRATORIO
650	1	4	_9167870 _aUTILIZACION DE LA TIERRA
650	1	4	_9166514 _aTERRENO EN DECLIVE
650	1	4	_9134763 _aAGRICULTURA DE LADERA
650	1	4	_9147821 _aFERTILIDAD DEL SUELO
650	1	4	_922334 _aBELICE
650	1	4	_92108 _aAMERICA CENTRAL
691			_9338214 _aSHIFTING CULTIVATION
691			_9152641 _aLAND USE
691			_9338734 _aSLOPING LAND
691			_9165093 _aSOIL FERTILITY
691			_922335 _aBELIZE
691			_922991 _aCENTRAL AMERICA
692			_aCULTURE ITINERANTE
692			_aUTILISATION DES TERRES
692			_aTERRE EN PENTE
692			_aFERTILITE DU SOL
692			_aBELIZE
692			_aAMERIQUE CENTRALE
773	0		_tAgro-Ecosystems (Países Bajos) _d1982 _gv. 8 p. 27-37
040			_aCR-TuBCO _cCR-TuBCO _bEs
245	1	0	_aDecline of soil fertility due to intensification of land use by shifting agriculturists in Belize, Central America
942			_cANA
003			CR-TuBCO
999			_c55553 _d55553