Foliar Concentration of Macronutrient and Production Components in Cotton Under Different Forms of Management of Growth Regulator Via Foliar and Seeds.

The aim of this paper was to assess the foliar concentration of macronutrients and production components in cotton grown in Cerrado area when submitted to treatment with doses of growth regulator through seeds and complementary different forms of foliar application of the product via foliar. The experimental design was randomized blocks in factorial scheme 5x3 with 15 treatments and 4 replications, consisting of: 5 doses of mepiquat chloride (MC): 0, 4, 6, 8 and 10 g a.i.kg^-1 of seeds, directly applied to the cotton seeds; Management of growth regulator via foliar with 250 mL ha^-1: split in four applications (35, 45, 55 and 65 days after emergence (d.a.e.)); single application at 70 d.a.e., and without product application. The used cultivar was FMT 701. It was found that the use of the split mode of application of MC performed higher values in the N content and foliar Mg when compared with the other forms of application. When analyzing the measurements MC applied via seeds, it was found that the foliar Mg content increased linearly according to the increasing of the used doses and the use of the highest dose (10g i.a.kg^{-1 o} of seed) negatively affected the mass of 20 bolls, number of bolls per plant and the production of the cotton seed.