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Bragantia  1979 

Aduba??o da cana-de-a?úcar: XV - experimentos com micronutrientes nas regi?es canavieiras do estado de S?o Paulo

DOI: 10.1590/S0006-87051979000100003

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the results obtained with twenty three experiments on the application of micronutrients to sugar cane are presented in this paper. the experiments were installed to evaluate the possible occurrence of micronutrient deficiencies in soils of s?o paulo state that had been more intensively cultivated with this crop. therefore, in the localization of the field plots care was taken securing a large variation of conditions, especially those of the soil that are related to availability of micronutrients. the experiments were planted in randomized block designs with four replications. the treatments were as follows: 1. 000 (general control); 2. npk (control); 3. npk + fe; 4. npk + b; 5. npk + cu; 6. npk + zn; 7. npk + mn; 8. npk + mo. the nitrogen, phosphorus and potassium were applied as ammonium sulfate, superphosphate and potassium chloride, at the rates of 80kg/n, l00kg/p2o5 and 120kg/k2o per hectare. the micronutrients were applied in the furrows in addition to the basic fertilization: iron, manganese, copper and zinc, as sulfates; boron, as borax, and molybdenum as ammonium molybdate. in accordance with the purpose of the study the soils of the experiments showed great variation in the characteristics that are involved with the micronutrients availability, as the ph and the original fertility level. in spite of this, in only one of the experiments the micronutrients, cooper and molybdenum in the case, gave yield increases; even so, the responses were not clearly related to the soil characteristics. the results indicate that problems concerning micronutrient deficiencies are not to be expected in the normal conditions of the sugar cane culture in s?o paulo state, thus, the possible occurrences of such anomalies, until now, must be related to fortuitous events.


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