棉 花 学 报    Cotton Science   2010，22（5）：454-459

Effects of N Fertilize Strategies on Chlorophyll Content in Leaf of Cotton under Mulch-film Drip Irrigation
WANG Ling^1,2, ZHU Jing-rong³, YANG Tao², WANG Bin², YANG Jin-yu², CHEN Bao-yan¹, LIU Hua², XU Yong-mei², MA Xing-wang^2*, ZHAO De-chen¹
(1.College of Resource and Environmental Sciences, Xinjiang Agricultural University, Urumqi 830052, China; 2. Institute of Soil and Fertilizer, Xinjiang Academy of Agricultural Sciences,Urumqi 830091, China; 3.Center Laboratory of Xinjiang Academy of Agricultural Science , Urumqi 830091, China)

Abstract: Field trail about the effects on the environment of crop land in cotton at different irrigation and different strategies of fertilizing under mulch-film drip irrigation was carried out in south Xinjiang, used chlorophyll meter SPAD-502 to measure SPAD value in cotton leaves and to analyze the relationship between chlorophyll SPAD values and cotton yield. The results showed that, at the whole growing period, to dynamic trend, peak and accumulation of chlorophyll SPAD values were different with different strategies of fertilizing. In the budding stage and flowerring stage, the accumulation of chlorophyll SPAD values were influenced by strategiess of fertilizing, but in the bolling stage, the influence was not remarkable. There were significant linear correlations between chlorophyll SPAD values and cotton yield, the higher the content of chlorophyll, the higher the yield. Excessive irrigation may not give high yield at optimum fertilization and strategy of fertilizing.
Key words: application of N fertilizing strategy；cotton；SPAD value；yield    [Full Text, 398KB]