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1、棉花学报CottonScience2015袁27渊5冤院408―416氮素对棉株上部果枝铃轧叶系统生长及生理特性的影响**陈静袁刘连涛袁王亚菲袁孙红春袁张永江袁李存东袁路战远渊河北农业大学/河北省作物生长调控实验室袁河北保定071001冤摘要院以鲁棉研28号为试验材料袁不施氮肥为对照袁在大田条件下研究低氮渊120kg窑hm－2冤尧中氮渊240kg窑hm－2冤尧高氮渊480kg窑hm－2冤处理对棉株上部果枝野铃轧叶系统冶的形态和生理生化效应遥结果表明院1冤中氮和高氮显著增加棉花上部果枝的长度尧叶面积袁高氮显著降
2、低上部果枝近远端直径比曰2冤与对照相比袁中氮上部果枝铃对位叶的叶绿素含量尧可溶性蛋白含量显著增加袁上部果枝棉子的可溶性蛋白含量也显著提高曰3冤中氮棉花果枝内外围铃重最大袁结铃后期显著大于对照遥氮肥提高棉花上部果枝的纤维品质袁以中氮内外围棉铃的纤维品质最优遥表明施适量氮肥能增强棉花上部果枝的野源轧库冶协调性遥关键词院棉花曰氮素曰上部果枝曰铃轧叶系统曰叶面积曰叶绿素含量曰可溶性蛋白含量中图分类号院S562.01文献标志码院A文章编号院1002-7807渊2015冤05-0408-0910.11963/issn.1
3、002-7807.201505004**ChenJing,LiuLiantao,WangYafei,SunHongchun,ZhangYongjiang,LiCundong,LuZhanyuan(071001,)TheobjectiveofourstudywastoinvestigatetheeffectsofN-fertilizationrateonthemorphologicalandphysiologicalcharacteristicsofthe"boll-leafsystem"intheupperf
4、ruitbranchesofcotton.Toachievethis,weconductedatwo-yearexperi-mentwithLumianyan28asamaterial.Therewerefourlevelsofnitrogenfertilization:controltreatment(N0,0kg窑hm－2),lownitrogen(N1,120kg窑hm－2),moderatenitrogen(N2,240kg窑hm－2)andhighnitrogen(N3,480kg窑hm－2).Th
5、emainresultswereasfollows:1)nitrogenfertilizationimprovedthebranchlengthandleafarea,anddecreasedthediameterratioofnearandfarbranches.Thedifferencesbetweenthecontroltreatmentandthemoderateandhightreatmentsweresignificant.2)Chlorophyllandsolubleproteincontent
6、sintheupperfruitbranches'leavesandseedswereincreasedbynitrogenfertilization.Thechloro-phyllandsolubleproteincontentsintheupperfruitbranches'leavesinthemoderatetreatmentweresignificantlyhigherthaninthecontrol.Thesolubleproteincontentintheupperfruitbranches's
7、eedsinthemoderatetreatmentwassignificantlyhigherthaninthecontrol.3)Withincreasingnitrogenfertilizer,thebollweightoftheupperfruitbranchesfirstincreasedandthende-creased.Thebollweightinthemoderatetreatmentwashigherthanintheothertreatments.Atthelatebollingstag
8、e,thediffer-encesbetweenthemoderateandcontroltreatmentsbecamesignificant.ThefiberqualitywasincreasedbyNapplication,andthemoderatetreatmenthadthebestqualityintheupperfruitbranches.Themorphologicalcharac
