The relationship between age and mineral content of Theobroma cacao leaves
It has been proved in rubber that a relationship exists between nutrient content and leaf age. That is also the case in cocoa. In this article the relationship between nutrient contents and leaf ages of cocoa clones DR 1 and DR 2 has been discussed. The data were collected from an experiment in which cocoa leaves of the clones were analysed, beginning at the age of 9 and ending at the age of 63 days. The experiment was carried out at "Kaliwining" experimental garden, which stand on a low gely humic soil. The leaves were sampled every 9 days for the analysis of their N, P, K, Ca, Mn and Mg contents. Analysis was ended when the leaves reached the age of 63 days. Statistical analysis has proved that there is no significant difference between the nutrient contents of these clones. The linear relationship between age and Ca-content existing in cocoa leaves could be used as an age index. As leaves should be sampled at the same age, the nutrient contents should be consequently corrected to a same Ca content. In this case is 1,2 per cent. For every 0,1 per cent Ca below or above 1,2 per cent Ca, the observed N, P and K contents must be decreased or increased by 0,82 per cent N, 0,017 per cent P and 0,063 per cent K, respectively and for Mn it shoud be increased/decreased by 6 ppm. There is no necessity for correcting the Mg
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| Format: | biblioteca |
| Published: |
1973
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| Subjects: | VALOR NUTRITIVO, THEOBROMA CACAO, CLONES, HOJAS, ANALISIS DE TEJIDOS, NITROGENO, FOSFORO, POTASIO, CALCIO, MAGNESIO, MANGANESO, EDAD DE LA HOJA, MINERALES, |
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