Adubação da cana-de-açúcar: XV - experimentos com micronutrientes nas regiões canavieiras do estado de São Paulo

Autor: Gentil Godoy Júnior, Hermano Vaz de Arruda, Raphael Alvarez, Antônio Carlos Pimentel Wutke
Rok vydání: 1979
Předmět:
Zdroj: Bragantia v.38 n.1 1979
Bragantia
Instituto Agronômico de Campinas (IAC)
instacron:IAC
Bragantia, Volume: 38, Issue: 1, Pages: 19-25, Published: 1979
ISSN: 0006-8705
DOI: 10.1590/s0006-87051979000100003
Popis: São apresentados os resultados de 23 experimentos em regiões canavieiras paulistas, para avaliar possíveis respostas da cana-de-açúcar a micronutrientes. Fizeram-se aplicações isoladas de sulfato ferroso, tetraborato de sódio, sulfato de cobre, sulfato de zinco, sulfato de manganês e molibdato de amônio, nos sulcos de plantio e na presença de adubação NPK Em apenas um dos experimentos verificou-se efeito significativamente favorável à aplicação de micronutrientes, no caso, cobre e molibdênio. Com base nos resultados obtidos, corroborados por análises foliares em trabalho paralelo e conduzido à mesma época, concluiu-se que, nas condições do ensaio, deficiências de micronutrientes não constituem problema para a lavoura canavieira no Estado de São Paulo. 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 São 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 São Paulo state, Thus, the possible occurrences of such anomalies, until now, must be related to fortuitous events.
Databáze: OpenAIRE
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