Effect of different application rates of nitrogen on yield and quality of cotton (Gossypium hirsutum).

摘要

This study was carried out to determine the effect of different application rates of nitrogen (N) on yield and quality of cotton (Gossypium hirsutum). N was applied to the soil at rates of 0, 100, 200 and 300 kg ha-1. Statistical results of study showed that N application significantly (P-0.05) increased boll number, boll weight, seed cotton weight of boll, seed cotton yield and lint yield. Moreover, leaf blade N concentration was affected by N application rate and increased significantly. Results of study also showed that the highest seed cotton yield was obtained in case of 200 kg ha-1 N application rate and this application rate resulted in 19.6% increased seed cotton yield. Statistical results showed that effect of different application rates of N was not significant for all studied fiber properties (fiber length, fiber strength and fiber fineness). Generally, application of 200 kg ha-1 N resulted in the highest boll number, boll weight, seed cotton yield and lint yield.