Effect of Nitrogen Level under Different Salinity Conditions on the Yield and Leaf Reddening in Cotton

Abstract

This experiment was carried out in the salinity laboratory at Alexandria in 1968. It included three salt concentrations: 4,000, 8.000 and 12.000 ppm of 1 : INaCI and CaCl2 in combination with three nitrogen levels: 0.0. 30, and 60 kgs N/acre.
Results indicated an inverse relationship between salinity and the yield of seed cotton per plant. As salinity was increased the yield of seed cotton per plant, the number of bolls per plant and the average boll weight was decreased. The yield of seed cotton, the number of bolls per plant and the average boll weight increased as the nitrogen level was increased.
Results also showed that leaf reddening in cotton resulting from high salinity might be controlled by optimal nitrogen level application. 60 kgs N/acre proved to be the most effective level in this respect.