Efeitos dos equilibrios entre cálcio, magnesio e potássio no crescimento do cacaueiro
Cacao seedlings grown under greenhouse conditions on a low fertility soil (oxysol) were submited to several levels of Mg (0.43, 0.89, 1.38, 1.87 e 3.98 mEq/100 g of soil) and Ca (1.99, 2.49, 2.99, 3.98, 4.58 e 5.48 mEq/100 g of soil) in order to determine the effect of Mg/K and Ca+Mg/K ratios on plant growth. One control, without fertilizers, in each assay was also included. All the plants received an uniform dosage of nitrogen, phosphorus, potassium and micronutrients. Increasing values of Mg/K and Ca+Mg/K ratios due to changes in basis content of the soil were obtained 15 days after fertilizers application. However, decreasing values in the levels of phosphorus, basis content and potassium were shown at the end of the experiment. The results obtained showed significant responses to high dosis of magnesium. However, the Mg/K ratio did not influence cacao growth. Data from dry mater measurements indicated a Ca+Mg/K ratio 16.5 to 24.5 to be the most suitable one for the growth of cacao under the conditions of this experiment. Since the relationships between production and Ca+Mg/K ratio could be represented by a straight line, it is suggested that the values obtained might theoretically be increased
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| Format: | biblioteca |
| Published: |
1971
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| Subjects: | THEOBROMA CACAO, SUELOS, CALCIO, MAGNESIO, POTASIO, ETAPAS DE DESARROLLO DE LA PLANTA, FERTILIDAD DEL SUELO, |
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