Composicao química das folhas do cacaueiro em funcao da idade e da época do ano
This study was conducted in order to determine the variations in mineral composition (N, P, K, Ca and Mg) of cacao leaves. The first part consisted in the determination of the most suitable leaf sample for chemical analysis as related to age, selfshading among leaves within the same tree and leaf flushings. The samples for this preliminary study were obtained from 4-year old Catongo cacao trees in an experimental field where fertilization timing was being studied. Subsequently another work was conducted to study the monthly variation of the major nutrients on leaves of cacao trees in shade by fertilizer. The results showed a trend of N and K to increase with fertilization and to decrease with leaf age; P showed little variation: a slight decrease in older leaves and a inverse response to fertilization. Calcium appeared at higher concentrations in the older leaves due to its low mobility and remained high in spite of leaf flushings. Magnesium was the least influenced by the factors under study. Little seasonal variation was observed for all the macro nutrients except potassium which decreased at the flushing period. Calcium showed an opposite pattern as compared to potassium. Shading and fertilization increased the levels of N and K while those of P and Mg decreased. The average values of N and K content of the leaves are, in general, lower than those obtained for other cocoa regions of the world
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| Format: | biblioteca |
| Published: |
1979
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| Subjects: | THEOBROMA CACAO, HOJAS, ANALISIS DE TEJIDOS, COMPOSICION QUIMICA, FERTILIZANTES NPK, FERTILIZANTES CALCICOS, MAGNESIO, CULTIVAR CATONGO, BAHIA, BRASIL, |
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