Data/hora: 04/06/2024 08:33:11

Provedor de dados: 	Acta Amazonica	
País: 	Brazil	
Título: 	Fertilization and cover crop effects on soil nitrogen and plant nutrition in a young guarana plantation	
Autores: 	Trujillo,Lucerina; Lehmann,Johannes; Cravo,Manoel da Silva; Atroch,André Luiz; Nascimento Filho,Firmino José do.	
Data: 	2003-12-01	
Ano: 	2003	
Palavras-chave: 	Acid tropical soil; Cover crop; Brazilian Amazon; Fruit tree; Nitrogen leaching.	
Resumo: 	Fruit tree production is gaining an increasing importance in the central Amazon and elsewhere in the humid tropics, but very little is known about the nutrient dynamics in the soil-plant system. The present study quantified the effects of fertilization and cover cropping with a legume (Pueraria phaseoloides (Roxb.) Benth.) on soil nitrogen (N) dynamics and plant nutrition in a young guarana plantation (Paullinia cupana Kunth. (H.B. and K.) var. sorbilis (Mart.) Ducke) on a highly weathered Xanthic Ferralsol. Large subsoil nitrate (NO3-) accumulation at 0.3-3 m below the guarana plantation indicated N leaching from the topsoil. The NO3- contents to a depth of 2 m were 2.4 times greater between the trees than underneath unfertilized trees (P&lt;0.05). The legume cover crop between the trees increased soil N availability as shown by elevated aerobic N mineralization and lower N immobilization in microbial biomass. The guarana N nutrition and yield did not benefit from the N input by biological fixation of atmospheric N2 by the legume cover (P&amp;gt;0.05). Even without a legume intercrop, large amounts of NO3- were found in the subsoil between unfertilized trees. Subsoil NO3- between the trees could be utilized, however, by fertilized guarana. This can be explained by a more vigorous growth of fertilized trees which had a larger nutrient demand and exploited a larger soil volume. With a legume cover crop, however, more mineral N was available at the topsoil which was leached into the subsoil and consequently accumulated at 0.3-3 m depth. Fertilizer additions of P and K were needed to increase subsoil NO3- use between trees.	
Tipo: 	Info:eu-repo/semantics/article	
Idioma: 	Inglês	
Identificador: 	http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000400001	
Editor: 	Instituto Nacional de Pesquisas da Amazônia	
Relação: 	10.1590/S0044-59672003000400001	
Formato: 	text/html	
Fonte: 	Acta Amazonica  v.33 n.4 2003	
Fonte: 	info:eu-repo/semantics/openAccess