Data/hora: 11/06/2024 06:56:15

Provedor de dados: | 36
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