Based on the cotton pot experiment involving four varieties (three were upland cotton and one was sea island cotton) and two N treatments and field experiment with different N treatments,the spatial differences of N and Chlorophyll contents (SPAD value) in the four upper fully expanded leaves and their relationships with whole leaf and plant N concentration were investigated. The results showed that leaf N contents and SPAD values at different leaf positions differed obviously,leaf N contents and SPAD values increased and differences among different position leaves decreased at high N rates. The sensitivity of the fourth leaf from the top to N was the highest,and next was that of the second leaf from the top was the lowest,while that of the first and the third leaves varied within the varieties. The SPAD value of the fourth leaf from the top was most correlated with whole leaf and plant N concentration among the top four leaves through the bud stage,initialflowering stage. The CV of SPAD value of the fourth leaf from the top was the smallest under optimal N level. It was suggested that the fourth leaf from the top was the most ideal indicator when using SPAD value or leaf color difference to diagnose N status in cotton.
Keywords
cotton /
nitrogen diagnosis /
SPAD value /
leaf position /
nitrogen content
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References
[1] 陈德华，陈 源，周桂生，等.长江流域棉区高产棉花干物质生产与产量及群体构成的关系
[J］.中国棉花，2001，28（10）：9-11. CHEN De-hua,Chen Yuan,Zhou Gui-sheng,et al. Relationship between dry matter and yield and constitutes for high yield cotton in the reaches of Yangtze River Valley
[J］. China Cotton, 2001,28(10):9-11.
[2］ BONDADA B R,Oosterhuis D M,Norman R J. Canopy photosynthesis growth yield and boll 15 N accumulation under nitrogen stress in cotton
[J］. Crop Science,1996,36(1):127-133.
[3］ WANG Shao-hua, Zhu Yan, Jiang Hai-dong, et al.Positional differences in nitrogen and sugar concentrations of upper leaves relate to plant N status in rice under different N rates
[J］.Field Crops Res,2006,96:224-234.
[4］ TURNER F T,Jund M F. Assessing the nitrogen requirements of rice crops with a chlorophyll meter
[J］. Aust ExpAgric,1994,34(7):1001-1005.
[5］ WANG Shao-hua,Cao Wei-xing, Wang Qiang-sheng, et al.Distribution of leaf color and nitrogen nutrition diagnosis in rice plant
[J］. Sci Agric Sin,2002,35(12):1461-1466.
[6］ 屈卫群，王绍华，陈兵林，等.棉花主茎叶SPAD值与氮素营养诊断研究
[J］. 作物学报,2007,33(6):1010-1017. QU Wei-qun,Wang Shao-hua,Chen Bing-lin,et al.SPAD value of cotton leaves on main stem and nitrogen diagnosis for cotton growth
[J］.Acta Agronomic Sinica,2007，33（6）：1010-1017.
[7］ 罗 振，董合忠，李维江，等.盐渍和涝渍对棉苗和叶片某些生理性状的复合效应
[J］.棉花学报，2008，20（3）：203-206. LUO Zhen,Dong He-zhong,Li Wei-jiang,et al.Combined effect of waterlogging and salinity on plant growth and some physiological parameters in cotton seeding leaves
[J］.Cotton Science,2008，20（3）：203-206.
[8］ 王登伟，黄春燕，张 伟，等.高光谱数据与棉花叶绿素含量和叶绿素密度的相关分析
[J］.棉花学报，2008，20（5）：368-371. WANG Deng-wei,Huang Chun-yan,Zhang Wei,et al.Relationships analysis between cotton chlorophyll content,chlorophyll density and hyperspectral data
[J］. Cotton Science,2008，20（5）：368-371.
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