| Texto completo | |
| Autor(es): |
Martins, Marcio dos Reis
[1]
;
Cora, Jose Eduardo
[1]
;
Jorge, Ricardo Falqueto
[1]
;
Marcelo, Adolfo Valente
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] UNESP, Dept Soil & Fertiliizers, BR-14884900 Jaboticabal, SP - Brazil
Número total de Afiliações: 1
|
| Tipo de documento: | Artigo Científico |
| Fonte: | SOIL & TILLAGE RESEARCH; v. 104, n. 1, p. 22-29, JUN 2009. |
| Citações Web of Science: | 45 |
| Resumo | |
The adaptation of no-tillage system in tropical regions depends on the suitable choice of summer and winter crops which should contribute to improvement of soil properties. The aim of the present study was to determine the effect of crop sequences on soil aggregation and contents of organic C and polysaccharides in aggregates of a Rhodic Eutrudox under no-tillage. The treatments consisted of the combination of four summer crop sequences and seven winter crop sequences. The summer crop sequences were: maize monocrop (Zea mays L.) (MM); soybean monocrop (Glycine max (L) Merrill) (SS); crop sequence of soybean/maize/soybean/maize (SM); crop sequence of rice (Oryza sativa L.)/bean (Phaseolus vulgaris L.)/cotton (Gossypium hirsutum L.)/bean (RB). The winter crops were: maize, sunflower (Helianthus annuus L.). radish (Raphanus sativus L.), pearl millet (Pennisetum americanum (L.) Leeke), pigeon pea (Cajanus cajan (L.) Millsp), grain sorghum (Sorghum bicolor (L.) Moench) and sunn hemp (Crotalaria juncea L.). The highest total organic C, total polysaccharides and dilute acid-extracted polysaccharides contents were found in 2.00-1.00 mm water-stable aggregates and the lowest contents were found in <0.25 mm aggregates. The maize monocrop provided the highest water-stability of soil aggregates. This crop sequence provided the highest content of total organic C and dilute acid-extracted polysaccharides in aggregates with diameter of 6.30-2.00 mm. This indicates that the influence of crops on the stability of aggregates is mediated by total organic C and easily hydrolysable polysaccharides (polysaccharides other than cellulose) in the soil. There were no differences among effects of the winter crops (maize, sunflower, oilseed radish, pearl millet, pigeon pea, grain sorghum and sunn hemp) on the soil aggregation. (C) 2008 Elsevier B.V. All rights reserved. (AU) | |
| Processo FAPESP: | 05/55500-1 - Caracterizacao de processos de transformacoes dos atributos fisicos e quimicos no solo sob diferentes esquemas de rotacao de culturas em sistema de semeadura direta. |
| Beneficiário: | José Eduardo Corá |
| Linha de fomento: | Auxílio à Pesquisa - Regular |
| Processo FAPESP: | 00/13948-2 - Caracterização dos processos de transformações físicas e químicas no solo sob diferentes esquemas de rotação de culturas em sistemas de plantio direto |
| Beneficiário: | José Eduardo Corá |
| Linha de fomento: | Auxílio à Pesquisa - Regular |