000			021260000a22003130004500
904			_aBCO
905			_aC
908			_aJ
909			_aAS
914			_aFORES
914			_aRIBRE
914			_aSILVI
082	0	4	_a11668
100	1		_9131501 _aWILKEN, G.C.
260			_c1977
520			_aInitial clearing and continued suppression of wild vegetation seem proof that farming and forest are incompatible. Yet many crop plants, like their wild relatives, fare better in species diverse, structurally complex communities. Some small-scale or traditional farmers in Middle America partially recreate forest conditions in their fields to improve edaphic and microclimate conditions. Farmers may either physically transfer forest products or simulate forest structures and nutrient cycles in cultivated fields. The particular strategies adopted depend upon local climatic conditions and crop requirements. Generally, crops requiring high levels of sunlight must be grown in the open, in field rather than forest microclimates. In such cases nearby forests may supply soil conditioning materials such as leaf litter to improve soil structure and nutrient levels. Alternatively, long term forest-farm rotations allow regeneration of forest soils. Where slight reductions of solar radiation are permissible scattered leguminous trees may be tolerated in cultivated fields. If greater protection is desirable at early or all stages of crop plant growth, aspects of forest structure and microclimates may be emulated either individually (e.g., forest litter, undergrowth) or collectively in multi-storied commercial farms of dooryard gardens
650	1	4	_9164789 _aSISTEMAS AGRICOLAS
650	1	4	_9134976 _aAGROFORESTERIA
650	1	4	_92108 _aAMERICA CENTRAL
691			_9134979 _aAGROFORESTRY
691			_922991 _aCENTRAL AMERICA
692			_aAGROFORESTERIE
692			_aAMERIQUE CENTRALE
773	0		_tAgro-Ecosystems (Países Bajos) _d1977 _gv.3 p.291-302
040			_aCR-TuBCO _cCR-TuBCO _bEs
245	1	0	_aIntegrating forest and small-scale farm systems in Middle America
942			_cANA
003			CR-TuBCO
999			_c55516 _d55516