Doses de sulfato de zinco na produção de mudas de pinheira RES UMOCom a finalidade de avaliar a influência do sulfato de zinco na nutrição e crescimento de mudas de pinheira (Annona squamosa L.), instalou-se um experimento no viveiro de produção de mudas da Universidade Federal Rural do Semi-Árido (UFERSA), situada no município de Mossoró, Estado do Rio Grande do Norte. Os tratamentos constaram de cinco doses de sulfato de zinco (0; 0,2; 0,4; 0,6 e 0,8 mg dm -3 ). Observou-se que doses relativamente moderadas de sulfato de zinco promoveram melhoria nas características avaliadas, exceto no comprimento do sistema radicular e na relação entre massa seca da parte aérea e do sistema radicular. Para a produção de porta-enxertos vigorosos de pinheira devem ser aplicados de 0,25 a 0,36 mg dm -3 de sulfato de zinco no substrato.Palavras-chave: adubação, fruteiras, Annona squamosa L., zinco, annonaceae Doses of zinc sulphate in the production of rootstocks of Annona squamosa L. AB S TR ACTAiming to evaluate the influence of zinc sulphate in the nutrition and growth of Annona squamosa L. seedlings, an experiment was carried out in the seedlings production nursery at the Federal Rural University of the Semi-arid (UFERSA), located in Mossoró municipality, Rio Grande do Norte State, Brazil. The treatments consisted of five doses of zinc sulphate (0; 0.2; 0.4; 0.6 and 0.8 mg dm-3) in a complete randomized block design, with four repetitions. The results indicated that, relatively moderate doses of zinc sulphate improved the evaluated characteristics, except the root length and the relation between shoot and root dry matter. For the production of vigorous door-grafts of A. squamosa, 0.25 to 0.30 mg dm -3 of zinc sulphate should be applied to the substratum.
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