Effect of hill spacing under different nitrogen rates on yield components yield and some fiber properties on egyptian cotton gossypium barbadense cultivar giza 75
El Gohary A.A.
Ain Shams University Faculty of Agriculture Research Bulletin 1731: 1-19
The effect of hill spacings, 15, 20, 25 and 30 cm, and different N rates, 40, 60 and 80 kg/feddan on yield components, yield and some fiber properties of the cotton cultivar, Giza 75 (G. barbadense L.), was studied. Neither N rates nor hill spacings affected boll weight. Number of open bolls per plant and yield of seed cotton per plant increased significantly by increasing N rates in 1981, but not in 1980. Both characters increased significantly by increasing hill spacing, in both seasons. Number of plants per feddan and percentage of plant stand at harvest were increased significantly by close spacings; N rates had little effect on both characters. Seed cotton yield per feddan increased significantly in 1980 and insignificantly in 1981 by decreasing the distance between hills. The highest yield was obtained with 60 kg N/feddan. Highest yield was obtained from the combinations 60 kg N .times. 20 cm in 1980 and 60 kg N .times. 15 cm in 1981. Generally, the earliest crop was associated with lower N rates or closer spacings. N rates and hill spacing treatments had little effect on lint percentage, fiber length, fiber strength and fiber fineness.