Fertilidade dos solos ocupados com cacaueiros no sul da Bahía
Chemical analysis of 40.026 soil samples covering approximately 117.000 ha of cultivated land were computed to determine variation in the levels of aluminum, calcium + magnesium, potassium, phosphorus and pH values throughout the southern region of Bahia, Brasil. The area sampled represented about 32 percent of the total area with cocoa in the region. The results showed some deviations in the level of those elements within the area surveyed. Soils of the north and central part of area displayed small amounts of exchangeable aluminum, high levels of calcium + magnesium and average pH around 6.2 and 5.9, respectively. On other hand, soils to the south were more acidic, with an average pH of 5.6, lower levels of calcium + magnesium and increase the aluminum exchange specially in the new areas recently cropped with cocoa. Statistically significant correlation coefficients were obtained between pH and exchangeable aluminum and calcium + magnesium. In all cases phosphorus was the most deficient nutrient ranging from 0 to 5 ppm. Potassium was found in the range from 0,10 to 0,30 mc/100 g. These results confirmed the finding obtained in previous investigations using the chemical and biological methods.
| Main Authors: | , , |
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| Format: | biblioteca |
| Published: |
1975
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| Subjects: | ZONAS CACAOTERAS, FERTILIDAD DEL SUELO, ANALISIS DEL SUELO, BAHIA, BRASIL, |
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| Summary: | Chemical analysis of 40.026 soil samples covering approximately 117.000 ha of cultivated land were computed to determine variation in the levels of aluminum, calcium + magnesium, potassium, phosphorus and pH values throughout the southern region of Bahia, Brasil. The area sampled represented about 32 percent of the total area with cocoa in the region. The results showed some deviations in the level of those elements within the area surveyed. Soils of the north and central part of area displayed small amounts of exchangeable aluminum, high levels of calcium + magnesium and average pH around 6.2 and 5.9, respectively. On other hand, soils to the south were more acidic, with an average pH of 5.6, lower levels of calcium + magnesium and increase the aluminum exchange specially in the new areas recently cropped with cocoa. Statistically significant correlation coefficients were obtained between pH and exchangeable aluminum and calcium + magnesium. In all cases phosphorus was the most deficient nutrient ranging from 0 to 5 ppm. Potassium was found in the range from 0,10 to 0,30 mc/100 g. These results confirmed the finding obtained in previous investigations using the chemical and biological methods. |
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