Respostas de cacaueiros Catongo a doses de fertilizantes no Sul da Bahia, Brasil
The effects of five levels of N, P2O5 and K2O on "Catongo" cacao were measured in eight plantations in Southern Bahia during 1971-80. The composite design proposed by Box was used with completely randomized blocks having two replicates in each area. Large effects of phosphate were recorded, mainly when 90 kg of P2O5 ha exponent -1 were added. Considerable effects of nitrogen were also found in the first 3 years. Although potassium was ineffective in the first 6 years, it became important in later years at levels of 120 kg ha exponent -1 of K2O. Low levels of production were recorded in four of the experiments, with yields declining in the last 2 years. Yields remained high in the other four areas. Leaf samples analysed in 1980 showed considerable treatment effects and the soils collected in the same year showed an increase of exchangeable A1 and A1 saturation in the complex. There was also a reduction of Ca and Mg in comparison to soil samples collected in non-experimental areas. The exchangeable A1 and A1 saturation increased progressively as depth increased, contrasting with most of the nutrients which were greater in the surface layer. In the four areas with low yields the A1 saturation, Fe and Cu were considerably higher than in the high yields areas, which showed higher amounts of Mn.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1982
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| Subjects: | THEOBROMA CACAO, CULTIVAR CATONGO, NIVELES DE FERTILIZACION, FERTILIZANTES NPK, DOSIS DE APLICACION, BAHIA, BRASIL, |
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