Época de semeadura de genótipos de algodoeiro em Uberlândia - MG

Abstract

The sowing time is important to provide better yields and better fiber quality, due mainly to adverse climatic phenomena such as droughts, low temperatures and rainfall at harvest. In order to establish an ideal sowing season for different cotton genotypes, the present study had as objective to evaluate the best sowing season of the genotypes of cotton PROMALG, for the environment of Uberlândia-MG. The experiment was carried out in field conditions, in the 2016/2017 harvest in the experimental area located at Fazenda Capim Branco, belonging to the Federal University of Uberlândia, in the city of Uberlândia, Minas Gerais. A complete randomized complete block design was used with four replications in a plot scheme subdivided in time, with the plots being sowing dates: 05/12, 19/12, 30/12, 13/01 and the subplots the genotypes: UFUJP-C, UFUJP-P, UFUJP-S, UFUJP-Z, DeltaOPAL 555 and Fibermax 966. Characteristics evaluated during the test were: number of floral buds, number of maces and buds, plant height flowering and maturity, seed mass, seed mass, feather mass, seed cotton yield, seed cotton yield, cotton seed yield, spinning consistency index, micronaire, maturation, fiber length, uniformity of length, short fibers, strength and elongation. Due to the average performance at the end of the evaluations of the 7 genotypes at the different sowing dates, aiming for productivity, the best time was the one performed on 02/12, with emphasis on the UFUJP-Z genotype. The UFUJP-S genotype proved to be more adapted to the second half of December, even in adverse conditions. For fiber quality, the genotype that presented the best results was UFUJP-C in the second sowing season (19/12).