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棉花学报  2015 

氮肥施用前移对遮荫下棉花光合特性及产量的影响

DOI: 10.11963/issn.1002-7807.201504011, PP. 379-384

Keywords: 棉花,氮肥施用前移,遮荫,光合特性,产量

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Abstract:

为探讨新疆南疆地区果棉间作下棉花适宜的氮肥追施模式，设置不施氮肥（N0）、氮肥追施至初花期结束（N1）、氮肥追施至盛花期结束（N2）和正常追肥（N3）。结果表明遮荫下氮肥追施至盛花期结束（N2）提高了棉花盛花期后主茎功能叶潜在活性（Fv/Fo）、最大光化学效率(Fv/Fm)和光化学猝灭系数(qP)，有利于光合色素将捕获的光能以较快的效率及速度转化成化学能，为碳同化提供更加充足的能量；同时增加棉花花铃期PSII开放程度和光合电子传递速率(ETR)，促进实际光化学效率（ΦPSII）和净光合速率的提高，降低了初花期非辐射能的耗散，可将捕获的光能更充分地进行光合生产，提高了花铃后期非辐射能的耗散，可为棉铃输送较多的光合产物，增加了单株铃数和铃重，提高了产量。

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