Physical and chemical attributes of a typic ultisol in organic citrus orchard with weed control between the lines/Atributos fisicos e quimicos de um argissolo vermelho, em pomar organico de citros com manejo da vegetacao nas entrelinhas
The management in organic citrus orchards is differentiated with respect to conventional orchards. Thus, it was aimed to evaluate some physical and chemical attributes of a typic ultisol and productivity of a mandarin orchard, cv. Montenegrin under organic production system, with different vegetatio...
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Published in: | Revista Brasileira de fruticultura Vol. 33; no. 4; p. 1127 |
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Main Authors: | , , , , , , |
Format: | Journal Article |
Language: | Spanish |
Published: |
Sociedade Brasileira de Fruticultura
01-12-2011
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Online Access: | Get full text |
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Summary: | The management in organic citrus orchards is differentiated with respect to conventional orchards. Thus, it was aimed to evaluate some physical and chemical attributes of a typic ultisol and productivity of a mandarin orchard, cv. Montenegrin under organic production system, with different vegetation management between the lines. The treatments were: harrowing, mowing, lodging with coulter and log dragging. The evaluation of the physical attributes occurred under the canopy and in the machinery traffic area, in the depths of 0.0-0.1 and 0.1-0.2 m. The chemical fertility of the soil was determined in the layer of 0.0-0.1, 0.1-0.2 and 0.2-0.4 m, while the fruit yield was estimated from central plants of each portion. Machine traffic negatively affected the physical attributes of soil below the interface patch, although it was not restrictive to fruit yield. In all treatments there was an increase of organic matter in the topsoil, and the levels of P, [K.sup.+], [Ca.sup.2+] and [Mg.sup.2+] in the three soil layers in relation to the adjacent area with native vegetation. The handling with harrowing showed significantly higher productivity in relation to the management with mowing. Index terms: organic farming, soil physics, citrus. O manejo em pomares organicos de citros e diferenciado em relacao aos pomares convencionais. Deste modo, objetivou-se avaliar alguns atributos fisicos e quimicos de um Argissolo espessarenico e produtividade do pomar de tangerineiras, cv. montenegrina, sob sistema organico de producao, com diferentes manejos da vegetacao nas entrelinhas. Os tratamentos estudados foram: gradagem, rocada, acamamento com rolo-faca e com arraste de tronco. A avaliacao dos atributos fisicos ocorreu sob a projecao da copa e na area de trafego de maquinas, nas camadas de 0,0-0,1 e 0,1-0,2 m. A fertilidade quimica do solo foi determinada nas profundidades de 0,0-0,1; 0,1-0,2 e 0,2-0,4 m, enquanto a produtividade de frutos foi estimada a partir das plantas centrais de cada parcela. O trafego de maquinas influenciou negativamente nos atributos fisicos do solo abaixo da interface pneu/solo, embora nao tenha sido restritivo a produtividade de frutos. Em todos os tratamentos, houve incremento de materia organica na camada superficial do solo e dos teores de P, [K.sup.+], [Ca.sup.2+] e [Mg.sup.2+] nas tres camadas de solo em relacao a area adjacente com vegetacao nativa. O manejo com gradagem apresentou produtividade significativamente maior em relacao ao manejo com rocada. Termos para indexacao: agricultura organica, fisica do solo, citricultura. |
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ISSN: | 0100-2945 |