Crescimento e produtividade de algodão colorido BRS Safira em diferentes populações de plantas

Abstract

The color cotton is important, both economically and environmentally, because it has greater aggregate value and avoid environmental pollution by dispensing step dyeing fibers. The objective of this study was to evaluate the growth and productivity of color cotton BRS Safira subject to different plant populations in central Rondônia. The experimental design was a randomized block design, with five treatments and four replications. The treatments consisted of using 5 spacing between plants, which were 0,1; 0.3; 0,5; 0,7 and 0,9 m, providing populations of 125,000; 41,667; 25,000; 17,857 and 13,889 plants ha-¹ , respectively. Each experimental unit presented 4 m wide and 6 m long, with 6 rows of plants spaced 0,80 m apart, being the two central lines the useful area. For growth analysis, we used six plants per plot. The variables valuated were plant height, stem diameter, leaf area, number of bolls per m², number of bolls per plant, weight of fruits per plant, productivity of seed cotton and cotton lint productivity. The increase in plant population causes morphological changes in cotton crops, reducing the stem diameter, plant height, leaf area, the number of fruits and weight of fruits per plant, but the number of bolls per m² is not influenced by different plant populations. There is a reduction in the yield of seed and lint of cotton in large and small populations of plants, being that the highest yields are obtained in populations of intermediate plants studied. The highest yield of seed cotton and cotton fiber were obtained from the estimated populations of 71,471 and 72,964 plants ha-¹ , respectively.