Effect of different plant density and nitrogen doses on cotton yield and quality

This investigation was carried out to determine the effects of different nitrogen doses and plant density on cotton yield, fiber quality criteria and some physiological properties. The study was carried out in Siirt University, Faculty of Agriculture, Department of Field Crops in the experimental area in 2022. In the study, which was carried out in 4 replications according to the split plots experimental design in random blocks, 4 different nitrogen doses (6, 12, 18 and 24 kg/da N) were formed in the main plots and plant density (5, 10 and 15 cm) in the sub plots. In the study, it was determined that there were significant statistical differences between applications in terms of seed cotton yield, number of sympodial branches, number of monopodial branches and number of nodes. It was determined that plant density had a significant effect on seed cotton yield and number of sympodial branches, nitrogen doses had a significant effect on the number of monopodial branches and number of nodes, and the interaction of nitrogen dose x plant density was effective on plant height. In the study, it was determined that the highest seed cotton yield was obtained from 5 cm plant density, and the highest sympodial branch number was obtained from 15 cm plant density. Among the nitrogen doses, it was determined that the highest number of monopodial branches and number of nodes were obtained at the nitrogen dose of 6 kg/da, and that the nitrogen doses and plant density did not have a significant statistical effect on the other properties examined. As a result of the study, it is understood that Orion cotton variety reaches the highest yield value by growing 5 cm above the row and therefore it can be recommended, and it can reach the highest monoodial branches number and node number value with the application of 6 kg/da nitrogen dose.