Effect of different levels of nitrogen fertilization on cotton growth and its bearing on leaf-reddening phenomenon [Egypt]
1985
Megahed, A.A. | Fouad, M.K. (Cairo Univ. (Egypt). Faculty of Agriculture) | Mohamed, H.M.
The Egyptian cotton cultivar "Giza 75" was cultivated in two successive seasons; 1980 and 1981 under five levels of added nitrogen; 0, 15, 30, 45 and 60 kgs. N/F. Results revealed that means of plant height, number and area of green leaves, dry weight of different plant organs, total nitrogen content of leaves were mostly increased with increasing nitrogen rates with significant or highly significant differences. Nitrogen fertilization especially with high levels reduced considerably the percentage of reddened plants, besides it reduced also the expressivity of leaf redness in these plants. In both normal and reddened plants significant increase in different attributes of yield components was mostly achieved by increasing the nitrogen rates. Normal plants under different nitrogen levels were superior than the reddened ones in yield and its components. This superiority decreased with increasing the level of added nitrogen. Percentage of reddened plants were highly negatively correlated with the different morphological and yield components traits under study.
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