Emergência e crescimento de algodoeiro colorido em solo com diferentes PST e doses de esterco.

Abstract

Because of the problems incurred in soil sodicity, there was a need to investigate ways of reducing losses caused by sodic soils and, therefore, there are several techniques to recover them. One is the use of organic matter. In this context, this work proposes to evaluate the feasibility of using soils with different percentages of exchangeable sodium and doses of manure in the production of cotton, analyzing their effects on growth and development. The experiment was conducted in a greenhouse at the Center for Science and Agrifood Technology of Federal University of Campina Grande, until 44 days after sowing. The treatments were distributed in a complete randomized block design in a factorial scheme 5 x 4, and three replications, and the treatments being composed of soils with five PST, and these S1 - 13.6; S2 - 22.4; S3 - 30.1; S4 - 39.0 and S5 - 48.0%, and the factor doses of manure, which are 0; 5; 10 and 15%. Until 10 days after sowing the percentage of exchangeable sodium did not affect the emergence and number of leaves of the cotton plant, from that period until 44 days after emergence the exchangeable sodium percentage between 27 and 30 caused greater plant height, diameter stem and fresh and dry weight of the aerial part. Increasing levels of organic matter promoted an increase in the initial growth of the plant and, at 44 days after emergence plant height, stem diameter and fresh and dry weight of shoots of cotton plants, the levels of organic matter also attenuated the effect of exchangeable sodium to the average percentage of 30% on the number of leaves, plant height, stem diameter and leaf area of cotton at 10 DAS; PST and average 28.5% and 34.0%, respectively, on the number of leaves and leaf area at 44 DAS.