| Registro completo |
| Provedor de dados: |
Acta Amazonica
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| País: |
Brazil
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| Título: |
Fertilization and cover crop effects on soil nitrogen and plant nutrition in a young guarana plantation
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| Autores: |
Trujillo,Lucerina
Lehmann,Johannes
Cravo,Manoel da Silva
Atroch,André Luiz
Nascimento Filho,Firmino José do
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| Data: |
2003-12-01
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| Ano: |
2003
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| Palavras-chave: |
Acid tropical soil
Cover crop
Brazilian Amazon
Fruit tree
Nitrogen leaching
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| 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<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>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.
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| Tipo: |
Info:eu-repo/semantics/article
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| Idioma: |
Inglês
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| Identificador: |
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0044-59672003000400001
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| Editor: |
Instituto Nacional de Pesquisas da Amazônia
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| Relação: |
10.1590/S0044-59672003000400001
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| Formato: |
text/html
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| Fonte: |
Acta Amazonica v.33 n.4 2003
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| Direitos: |
info:eu-repo/semantics/openAccess
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