A toxicidade de zinco promove desordens nutricionais específicas para plantas de milheto, com prejuízos na produção de matéria seca. Objetivou-se com esse experimento avaliar os efeitos da aplicação de zinco no crescimento, na nutrição e na produção de matéria seca de plantas de milheto cultivadas em condições de casa de vegetação. O experimento foi desenvolvido na FCAV/UNESP em vasos preenchidos com 3 dm 3 de amostra do horizonte superficial de um Latossolo Vermelho Distrófico, textura média, no período de outubro a dezembro de 2008. Para isso, foram utilizadas seis doses de zinco (0, 15, 30, 60, 120 e 360 mg dm -3 ), na forma de sulfato de zinco, dispostas em um delineamento experimental inteiramente casualizado e com quatro repetições. Aos 45 dias após a emergência, realizou-se o corte das plantas, sendo avaliadas a altura, o diâmetro dos perfilhos, o número de perfilhos, a área foliar, a massa foliar e o teor de Zn na matéria seca da parte aérea. O uso de altas doses de zinco diminuiu o crescimento e a produção de matéria seca do milheto, atingindo a toxicidade com teor de Zn na parte aérea de 451 mg kg -1 .Palavras-chave: Desordem nutricional, micronutriente, nutrição de plantas, Pennisetum glaucum L. Zinc toxicity in millet grown in a Red Dystrophic Oxisol ABSTRACTZinc toxicity causes nutritional disorders specific for millet plants, damaging dry matter production. The objective of this experiment was to evaluate the effects of zinc application on millet dry matter growth, nutrition and production, grown under greenhouse conditions. The experiment was carried out in FCAV / UNESP in pots filled with a 3 dm 3 sample of the superficial horizon of a medium textured Red Dystrophic Oxisol, during the period of October to December 2008. Six doses of zinc (0, 15, 30, 60, 120 and 360 mg dm -3 ), in the form of zinc sulphate, were applied to the soil. The experiment was arranged in a completely randomized design with four replications. 45 days after emergence, the plants were cut and height, diameter of tillers, number of tillers, leaf area and mass and Zn content in shoot dry matter were evaluated. The use of high doses of zinc decreased millet growth and dry matter production, reaching Zn the toxicity levels in the shoots of 451 mg kg -1 .
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