Title:	Soil phosphorus properties and management for perennial crops in the central Amazon.
Authors:	CRAVO, M. da S. LEHMANN, J. MACEDO, J. L. V. de
Affiliation:	MANOEL DA SILVA CRAVO, CPAA JEFERSON LUIS VASCONCELOS DE MACEDO, CPAA.
Date Issued:	2002
Citation:	In: GERMAN-BRAZILIAN WORKSHOP ON NEOTROPICAL ECOSYSTEMS. ACHIEVEMENTS AND PROSPECTS OF COOPERATIVE RESEARCH, 2000, Hamburg. Proceedings... Hamburg: SHIFT: MADAM: WAVES, 2002. p. 477-484.
Description:	Tree crop production is gaining considerable importance in the central Amazon. However, the soils in the central Amazon are extremely poor in available P. The present contribution assesses the soil P status of central Amazonian upland soils, the effects of fertilization on soil P availability and tree crop growth, as well as the influence of large P recycling by tree crops on soil P availability. Soil fertility management has to target the prevalent P deficiency by adequate P fertilization. P fixation to clay minerals was not a major obstacle for P management in the highly weathered soils of the central Amazon due to their high kaolinite contents. P fertilization to tree crops is effective in aleviating P deficiency and increasing crop growth. Large P return to soil by litterfall, throughfall and stemflow was found to improve soil P availability. Tree crops were found to be P conservative with respect to exports. Once fertilization replenished P for biomass production, P fertilization can be reduced to match P exports by harvests.
NAL Thesaurus:	phosphorus soil types
Keywords:	Central Amazon Nutrient Cycling Perennial Crops P Fixation
Type of Material:	Artigo em anais e proceedings
Access:	openAccess
Appears in Collections:	Artigo em anais de congresso (CPAA)