Algodão colorido BRS verde sob diferentes doses de cloreto de mepiquat.

Abstract

Colored cotton has great social and economic importance for the Northeast region. It is important socially to favor the permanence of the man in the field, reducing the rural and economic exodus, due to the greater appreciation of the naturally colored fiber, around 39 to 78% more than the white fiber, leading to greater profitability. The objective of this study was to evaluate the behavior of the BRS Verde colored cotton cultivar to the use of different doses of mepiquat chloride. The experimentwas conducted in a greenhouse between August and December 2018 at UFRPE / UAST, PE. The statistical design was completely randomized, where the treatments resulted in the application of 5 doses of growth regulator based on mepiquat chloride -0,0; 0.07; 0.14; 0.21; 0.28 Lha-1 and 4 replicates. The obtained data were submitted to analysis of variance and when verified the significant effect they were submitted to the analysis of polinomial regression through the Sivar software. Variations of plant height, distance between nodes, number of nodes, stem diameter, leaf area, dry shoot mass, root dry weight and total dry mass, height of first flower bud, height of first flower insertion , number of flowers, number of apples, number of beaks per plant, beet mass, fiber production and seed cotton production. The use of mepiquat chloride in BRS Verde colored cotton provided similar behavior in the plants that received application of the product, however when compared to the control plants there was a difference between them. The productive parameters of the BRS Green cotton are reduced with the use of mepiquat chloride from the dose of 0.07 L.ha-1 and tend to decrease simultaneously as the doses of the growth regulator are intensified. With regard to the analyzes of phytomass of shoot and root, with the application of mepiquat chloride in the BRS Verde cotton cultivar, the average values obtained were obtained, resulting in larger masses for the treatments used.