The effect of Al/(K + Ca + Mg) ratio on growth of cocoa seedling
An experiment to study the effect of Al/(K+Ca+Mg) ratio on growth of cocoa seedling had been conducted in the glasshouse of Indonesian Coffee and Cocoa Research Institute (ICCRI) since July 1989 to January 1990. The experiment was held in Randomized Complete Block Design consisted of seven treatments and four replications. Modified Hoagland nutrient solution was used as growth medium for cocoa seedlings. Treatments were Al/(K+Ca+Mg) ratio in growth medium, i.e. 5, 10, 15, 20, 25, 30, and 35 percent. Aluminum concentration was constantly lined up on 16 ppm, whereas potassium, calcium, and magnesium concentrations were decreased proportionally so that Al/(K+Ca+Mg) ratio was appropriate with the treatment. To confirm whether they were really resulted by Al/(K+Ca+Mg) ratio and were not influenced by the decrease of potassium, calcium, and magnesium concentrations a similar experiment was conducted on potassium, calcium, and magnesium concentrations without aluminum. The parameters affected by Al/(K+Ca+Mg) ratio only were used to conclude that Al/(K+Ca+Mg) ratio had an influence on the growth of cocoa. Observation was conducted on four month old plants. The results showed that the critical limit of Al/(K+Ca+Mg) ratio on growth medium for cocoa was as high as 30 percent, but there were negative linear relations between Al/(K+Ca+Mg) ratio and the diameter, the stem dry weight, the leaf area, as well as the leaf dry weight of cocoa, respectively. The sensitive growth parameter of cocoa to Al/(K+Ca+Mg) ratio was the leaf area.
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| Format: | biblioteca |
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| Subjects: | THEOBROMA CACAO, PLANTULAS, APLICACION DE FERTILIZANTES, ALUMINIO, CATIONES, ETAPAS DE DESARROLLO DE LA PLANTA, |
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