棉 花 学 报    Cotton Science    2008，20(5)：379-384

Effects of N and K on Photosynthetic Characteristics and Yield & Fiber Quality of Short-Season Cotton
LI Ling-li¹，FANG Wei-ping²，MA Zong-bin¹，XIE De-yi²，DU Yuan-fang³，ZHANG Dong-lin³
(1.College of Agronomy, Henan Agricultural University, Zhengzhou 450002，China；2.Economy Crop Research Institute, Henan Academy of Agricultural Sciences, Zhengzhou 450002, China；3.County Cotton Production Office, Kaifeng, Henan 457100, China)

Abstract：Effects of nitrogen and potassium fertilizer on photosynthetic characteristics and yield & quality of short-season cotton were studied under field experiments. Two urea (N) levels 225kg·hm^-2 and 300kg·hm^-2 and three KCl (K) levels 0kg·hm^-2, 120kg·hm^-2 and 195kg·hm^-2 were used in the experiments. The results indicated that photosynthetic capability in leaves of cotton and yield were higher applied more N than less N under the same K levels, and N utilize efficiency increased when applying more K. Meanwhile, photosynthetic capability in leaves of cotton , yield and quality was higher applied K than no K under the same N levels, and seed cotton yield were significantly different when applying different K levels. The highest yield was gained when applying urea 300kg·hm^-2 and KCl 195 kg·hm^-2 under this experiments condition. So, supplying suitable K to keep balance of N and K is extremely important to improve N utilize efficiency, yield and quality of cotton under enough N.
Key words：nitrogen and potassium fertilizer；photosynthetic characteristics；yield；fibers
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