Data/hora: 26/09/2024 02:25:39

Biblioteca(s): 	Embrapa Arroz e Feijão; Embrapa Soja.	
Data corrente: 	07/11/2011	
Data da última atualização: 	19/07/2024	
Autoria: 	MOREIRA, A.; FAGERIA, N. K.; GARCIA Y GARCIA, A.	
Afiliação: 	ADONIS MOREIRA, CNPSO; NAND KUMAR FAGERIA, CNPAF; A. GARCIA Y GARCIA, University of Wyoming.	
Título: 	Soil fertility, mineral nitrogen, and microbial biomass in Upland soils of the Central Amazon under different plant covers.	
Ano de publicação: 	2011	
Fonte/Imprenta: 	Communications in Soil Science and Plant Analysis, Philadelphia, v. 42, n. 6, p. 694-705, 2011.	
DOI: 	10.1080/00103624.2011.550376	
Idioma: 	Inglês	
Conteúdo: 	Amazon is the largest state in Brazil and majority of the state is covered by the largest tropical rainforest of the world. Most soils of the Amazon region soils are acidic and infertile. When the Amazon forest land is cleared for agricultural use by burning the vegetation, the efficient nutrient recycling mechanisms are disrupted. However, nutrient contents in the deforested burn land increased temporarily. The objective of this study was to evaluate the soil fertility, mineral nitrogen (N), and microbial activity of carbon (C), N, and phosphorus (P) resulting from the replacement of the primary forest with pasture (Brachiaria brizantha) and commercial plantations of rubber (Hevea spp.), cupuaçu (Theobroma grandiflorum), and citrus trees (Citrus sinensis) cultivated in Xanthic Ferralsol and secondary forest under Acrisols Dystric Nitosols. The results showed that ammonium-N predominates in the 0- to 10-cm soil depth in both primary forest and areas with secondary forest, citrus plantation, and pasture. There was no increase in soil fertility with management of the cultivated areas under the secondary forest, but in the pasture there was a significant increase in the stock of organic C and total N and high C/N ratios, the inverse of what occurred with the C of the microbial biomass. The primary forest had the greatest values of C and P of the microbial biomass and the lowest metabolic quotient. Of the successions studied, the rubber trees were the plant cover with the smallest changes in terms of quality of the organic matter in the soil.	
Palavras-Chave: 	Amazon forest.	
Thesagro: 	Fertilidade do solo; Nitrogênio; Pastagem; Plantio.	
Thesaurus Nal: 	Biogeochemical cycles; Nitrogen; Pastures; Soil fertility.	
Categoria do assunto: 	P Recursos Naturais, Ciências Ambientais e da Terra	
Registro original: 	Embrapa Soja (CNPSO)	
Exemplares: 	CNPSO - (32430-1) - UPC - AP - DD -  -  -  - DIS
CNPAF - (30966-1) - UPC - AP - PP - 2011.057 -  - 2011.057 - DIS