Pulverização foliar de manganês com adição de silício é viável para plantas de milho e de sorgo
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Data
2019-03-06
Autores
Oliveira, Kamilla Silva
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Universidade Estadual Paulista (Unesp)
Resumo
A pulverização foliar de manganês (Mn) é amplamente utilizada em cultivos anuais dada a deficiência do micronutriente no solo. A adição de silício (Si) na calda com o Mn poderia favorecer aspectos fisiológicos e nutricionais e a produção de plantas de milho e sorgo. Objetivou-se avaliar os efeitos do Mn e Si fornecidos via pulverização foliar na nutrição foliar de plantas de milho e de sorgo sob deficiência de Mn. Foram desenvolvidos dois experimentos, um com a cultura do milho (experimento milho) em casa de vegetação e outro com a cultura do sorgo granífero (experimento sorgo) em sala climatizada. O experimento milho foi composto de arranjo fatorial 4x2, sendo concentrações de Mn 0,0; 0,29; 0,58 e 0,87 g L-1na ausência e presença de Si (0,476 g L-1de Si) aplicados via foliar no estágio V4 e V6.O experimento sorgo foi realizado em arranjo fatorial 4x2 com concentrações de Mn 0,0; 0,17; 0,34 e 0,51 g L-1 na ausência e presença de Si (0,476 g L-1de Si) aplicados via foliar no estágio V4 e V6. Em ambos os experimentos avaliaram-se variáveis fisiológicas e de produção de massa seca para verificar efeito do Si e Mn na nutrição das plantas. A pulverização foliar de Mn com adição de Si na calda incrementou o acúmulo do micronutriente, o índice relativo de clorofila, a eficiência quântica do FSII, a eficiência do uso da água e refletiu na produção de massa seca das plantas de milho e sorgo. A pulverização foliar de Mn com adição de Si na calda é viável para as plantas de milho e de sorgo.
Foliar spraying of manganese (Mn) is widely used in annual crops due to micronutrient deficiency in the soil. The addition of silicon (Si) in the application liquid with Mn could favor physiological and nutritional aspects and the production of maize and sorghum plants. The objective of this study was to evaluate the effects of Mn and Si supplied by foliar spraying on leaf nutrition of maize and sorghum plants under Mn deficiency. Two experiments were carried out, one with maize (corn experiment) in greenhouse and the other with sorghum (sorghum experiment) in climatized room. The corn experiment was composed of factorial arrangement 4x2, with concentrations of Mn 0,0; 0.29; 0.58 and 0.87 g L-1 in the absence and presence of Si (0.476 g L-1 of Si) applied via leaf in stage V4 and V6. The sorghum experiment was performed in a 4x2 factorial arrangement with concentrations of Mn 0,0; 0.17; 0.34 and 0.51 g L-1 in the absence and presence of Si (0.476 g L-1 of Si) applied via foliar in stage V4 and V6. In both experiments were evaluated the physiological and dry mass production variables to verify the effect of Si and Mn on plant nutrition. Foliar spraying of Mn with addition of Si in application liquid increased micronutrient accumulation, relative chlorophyll index, FSII quantum efficiency, water use efficiency, and reflected in the dry mass production of corn and sorghum plants. Foliar spraying of Mn with addition of Si in application liquid is viable for maize and sorghum plants.
Foliar spraying of manganese (Mn) is widely used in annual crops due to micronutrient deficiency in the soil. The addition of silicon (Si) in the application liquid with Mn could favor physiological and nutritional aspects and the production of maize and sorghum plants. The objective of this study was to evaluate the effects of Mn and Si supplied by foliar spraying on leaf nutrition of maize and sorghum plants under Mn deficiency. Two experiments were carried out, one with maize (corn experiment) in greenhouse and the other with sorghum (sorghum experiment) in climatized room. The corn experiment was composed of factorial arrangement 4x2, with concentrations of Mn 0,0; 0.29; 0.58 and 0.87 g L-1 in the absence and presence of Si (0.476 g L-1 of Si) applied via leaf in stage V4 and V6. The sorghum experiment was performed in a 4x2 factorial arrangement with concentrations of Mn 0,0; 0.17; 0.34 and 0.51 g L-1 in the absence and presence of Si (0.476 g L-1 of Si) applied via foliar in stage V4 and V6. In both experiments were evaluated the physiological and dry mass production variables to verify the effect of Si and Mn on plant nutrition. Foliar spraying of Mn with addition of Si in application liquid increased micronutrient accumulation, relative chlorophyll index, FSII quantum efficiency, water use efficiency, and reflected in the dry mass production of corn and sorghum plants. Foliar spraying of Mn with addition of Si in application liquid is viable for maize and sorghum plants.
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Palavras-chave
Zea mays, Sorghum bicolor, Mn, Zea mays, Sorghum bicolor, Mn, Deficiência, Elemento benéfico, Fotossíntese, Deficiency, Beneficial element, Photosynthesis