Effect of boron, calcium, and magnesium on cherelle wilt in cacao
Soil and foliar application of boron raised the boron leaf levels in the "Upper Amazon" cacao from 11.38 ppm to 88.38 ppm over a period of twenty months. Similar increase in boron content was obtained due to application of borax in combination with calcium and magnesium. Initial foliar calcium content of 0.85 per cent increased to 2.7 per cent over a period of twenty months. Application of calcium alone as well as calcium in combination with boron and magnesium resulted in similar increase in leaf calcium content. Progressive increase in foliar magnesium content as a result of soil and foliar applications of magnesium was recorded. The initial level of 0.12 per cent increased to 0.29 per cent as a result of foliar and soil application of magnesium. Wilting pods contained almost twice as much boron as in healthy pods. Calcium and magnesium levels were higher in healthy pods than in wilting pods of corresponding growth stages. Calcium alone reduced the cherelle wilt by about one per cent. Foliar and soil application of calcium resulted in increased number of cherelles carried to maturity. Trees treated with calcium carried 41.4 cherelles to maturity, as compared to 27 in control. Number of beans per pod was not influenced by boron, calcium and magnesium. However, treatment with calcium resulted in maximum yield of wet beans per tree per year
| Main Authors: | , |
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| Format: | biblioteca |
| Published: |
1980
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| Subjects: | THEOBROMA CACAO, BORO, CALCIO, MAGNESIO, FERTILIZANTES DE OLIGOELEMENTOS, MARCHITEZ FISIOLOGICA, APLICACION FOLIAR, APLICACION LOCAL, CLONES DEL ALTO AMAZONAS, DEFICIENCIA DE MINERALES, ENFERMEDADES CARENCIALES, |
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| Summary: | Soil and foliar application of boron raised the boron leaf levels in the "Upper Amazon" cacao from 11.38 ppm to 88.38 ppm over a period of twenty months. Similar increase in boron content was obtained due to application of borax in combination with calcium and magnesium. Initial foliar calcium content of 0.85 per cent increased to 2.7 per cent over a period of twenty months. Application of calcium alone as well as calcium in combination with boron and magnesium resulted in similar increase in leaf calcium content. Progressive increase in foliar magnesium content as a result of soil and foliar applications of magnesium was recorded. The initial level of 0.12 per cent increased to 0.29 per cent as a result of foliar and soil application of magnesium. Wilting pods contained almost twice as much boron as in healthy pods. Calcium and magnesium levels were higher in healthy pods than in wilting pods of corresponding growth stages. Calcium alone reduced the cherelle wilt by about one per cent. Foliar and soil application of calcium resulted in increased number of cherelles carried to maturity. Trees treated with calcium carried 41.4 cherelles to maturity, as compared to 27 in control. Number of beans per pod was not influenced by boron, calcium and magnesium. However, treatment with calcium resulted in maximum yield of wet beans per tree per year |
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