Yield and yield components of three varieties of cotton, under the influence of different densities

The effect of planting density on yield and yield components of three varieties of cotton were studied in Agriculture and Natural Resources Research Center, Isfahan during 2 years. Experiment was done using a factorial experiment in randomized complete block design with four replications. Tabladyla, B557 and Varamin (control) cultivars were considered as the first factor and three planting densities 7.1, 9.5 and 14.3 plant m-2 as the second factor, respectively. By results, there was a statistically significant difference between the cultivars. B557 varieties, with production of 5,471 kg ha-1, had highest yield in this study. The first and second years, 55 and 64 percent of the yield of was obtained the first harvest respectively. B557 produced significantly more boll number than others. Boll weight showed no-significant difference. Effect of various planting densities and the interaction of density and varieties on yield and yield components were not statistically significant. The lowest densities used in this study (7.1 plant m-2) had the lowest percentage of stand plants in a hectare. Density of 14.3 plants m-2 meter with 116.2 cm in height had the highest amount. According to the results of this study, cultivars can tolerated a wide range of densities without loss of performance. On the other hand, the yield potential of the B557 cultivar is higher than the other two varieties.