Photosynthetic characteristics and yield of cotton under different nitrogen application rate in Southen Xinjiang
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DOI：10.7606/j.issn.1000-7601.2011.02.07
Key Words: cotton  nitrogen application rate  photosynthetic characteristic  yield
Author NameAffiliation
LUO Xinning College of Plant Science，Tarium University， Alar, Xinjiang 843300， China 
CHEN Bing College of Grassland and Envirornment，Xinjiang Agricultural University， Urumuqi, Xinjiang 830052，China 
ZHANG Jusong College of Agronomy , Xinjiang Agricultural University，Urumuqi, Xinjiang 830052，China
National Cotton Research Center of Ministry of Education，Urumuqi, Xinjiang 830052， China 
JIANG Pingan College of Grassland and Envirornment，Xinjiang Agricultural University， Urumuqi, Xinjiang 830052，China 
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Abstract:
      Based on an nitrogen experiment under ecological condition in Southen Xinjiang，the effect of nitrogen fertilizer on photosynthentic characteristics and yield of cotton were investigated . The result showed that topdressing nitrogen rate could improve photosynthetic characteristics and the chlorophyll content of cotton，delay senescence of leaves and raise net photosynt hesis rate; cotton leaves area and LAI were enhanced with reasonable N application, and LAI decreased rapidly in later stages with excessive N rate. Shedding rate of cotton stem leaf declined when N rate was 258.75 kg/ hm2. Cotton yield increased when N rate applied was among 0~258. 75 kg/hm2，and decreased until N rate applied exceed 258.75 kg/ hm2.
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