teores de zinco, cobre, manganês e ferro em dois latossolos sob plantios direto e convencional zinc, copper, manganese, and iron content in two latosols from são paulo state, brazil, under conventional and no-tillage cropping system
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ID: 171242
1992
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Abstract
Estudou-se a influência dos sistemas de plantio direto e preparo convencional, após três anos de cultivo, nos teores de zinco, cobre, manganês e ferro, extraídos com DTPA-TEA, em dois latossolos vermelho-amarelos (LV) do Estado de São Paulo: um de textura argilosa, em Itatiba, e outro de textura média, em Casa Branca. Utilizaram-se amostras coletadas em cinco camadas (0-5, 5-10, 10-20, 20-30 e 30-50 cm), com doze pontos de amostragem por tratamento. Observou-se, em profundidade, um decréscimo acentuado nos níveis de zinco e de manganês nos dois latossolos, e de ferro no LV textura argilosa, podendo a diminuição dos teores de matéria orgânica ser um dos fatores responsáveis por esse decréscimo, principalmente para Zn e Mn. Houve diferenças significativas nos níveis de cobre e de manganês nos dois sistemas de preparo do solo no LV textura argilosa, sendo os teores de cobre e de manganês maiores no plantio direto. O sistema de cultivo não influiu nos teores de zinco e de ferro nos dois latossolos.
The effect of three years cropping (1982 to 1985) under no-tillage and conventional tillage on the DTPA-TEA extractable zinc, copper, manganese, and iron content of a clayey and a medium-textured Red-Yellow Latosols from São Paulo State, Brazil, were studied. The sites were sampled at five depths (0-5 cm, 5-10 cm, 10-20 cm, 20-30 cm, and 30-50 cm) with twelve replications per treatment. Increasing the depth, a significant decrease in the levels of zinc and manganese, in both soils, and of iron in the clayey Red Yelow-Latosol, was observed. Variations in the concentration of zinc, manganese, and iron were highly correlated with the soil organic matter content. The levels of copper and manganese were affected by the tillage system in the clayey Red-Yellow Latosol: both elements were higher in the no-tillage treatment. On the other hand, the tillage system did not affect the concentration of zinc and iron in the soils studied.
The effect of three years cropping (1982 to 1985) under no-tillage and conventional tillage on the DTPA-TEA extractable zinc, copper, manganese, and iron content of a clayey and a medium-textured Red-Yellow Latosols from São Paulo State, Brazil, were studied. The sites were sampled at five depths (0-5 cm, 5-10 cm, 10-20 cm, 20-30 cm, and 30-50 cm) with twelve replications per treatment. Increasing the depth, a significant decrease in the levels of zinc and manganese, in both soils, and of iron in the clayey Red Yelow-Latosol, was observed. Variations in the concentration of zinc, manganese, and iron were highly correlated with the soil organic matter content. The levels of copper and manganese were affected by the tillage system in the clayey Red-Yellow Latosol: both elements were higher in the no-tillage treatment. On the other hand, the tillage system did not affect the concentration of zinc and iron in the soils studied.
| Reference Key |
castro1992bragantiateores
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|---|---|
| Authors | ;Orlando Melo de Castro;Otávio Antonio de Camargo;Heitor Cantarella;Sidney Rosa Vieira;Sônia Carmela Falci Dechen |
| Journal | revista espanola de salud publica |
| Year | 1992 |
| DOI |
10.1590/S0006-87051992000100011
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| URL | |
| Keywords | Keywords not found |
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