Phosphorus analysis in soil under herbaceous perennial leguminous cover by nuclear magnetic spectroscopy

Pesquisa Agropecuária Brasileira

Luciano Pasqualoto Canellas²  José Antônio Azevedo Espíndola¹  José Guilherme Marinho Guerra¹  Marcelo Grandi Teixeira¹  Ary Carlos Xavier Velloso²  Victor Marcos Rumjanek¹ 

[1] ,Universidade Estadual do Norte Fluminense Laboratório de Solos Campos dos Goytacazes RJ ,Brazil

关键词: cultivation;    deforestation;    cover crops;    cultivo;    desmatamento;    culturas de cobertura do solo;   

DOI  :  10.1590/S0100-204X2004000600011

来源: SciELO

【 摘 要 】

The availability and the reserves of organic phosphorus are controlled by its mineralization rate and are also influenced by changes in soil management. The objective of this study was to evaluate the influence of soil covering with different leguminous plant on soil organic P by 31P-NMR spectroscopy. Alkaline soil extracts were obtained from two depths (0-5 and 5-10 cm) of an Ultisol cultivated with herbaceous perennial leguminous plants (Arachis pintoi, Pueraria phaseoloides, Macroptilium atropurpureum). In an adjacent area, samples of the same soil cover with a secondary tropical forest and grass (Panicum maximum) were also collected. The leguminous management was divided into with removal and without removal of shoot parts after cut on soil surface. Phosphate monoesters are the dominant P species in all soil samples and P diesters accumulated on the superficial layer of secondary forest soil. The P amount of this fraction is higher for the legume covered soil when compared with the grass covered soil. The permanence of leguminous plants on the topsoil after the cut promoted an increase in P diester/P monoester ratios. These findings can be accounted for an enhancement of P availability to plants in soils cultivated with leguminous plants.

【 授权许可】

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