作物学报 ›› 2014, Vol. 40 ›› Issue (11): 2008-2015.doi: 10.3724/SP.J.1006.2014.02008
曾勇军1,2,吕伟生1,潘晓华1,朱德峰2,谭雪明1,黄山1,商庆银1,石庆华1,*
ZENG Yong-Jun1,2,LÜ Wei-Sheng1,PAN Xiao-Hua1,ZHU De-Feng2,TAN Xue-Ming1,HUANG Shan1,SHANG Qing-Yin1,SHI Qing-Hua1,*
摘要:
以陆两优996和淦鑫203为材料,研究了相同施氮量条件下不同氮肥追施方法和追用时期对双季超级早稻的株型特征及物质生产特性的影响。结果表明:与移栽后5 d一次性追施氮肥相比,分次追施氮肥有利于提高植株上部三节间的长度,促进壮秆形成和塑造理想株型,延缓叶片叶绿素含量的下降并促进后期光合物质生产量的提高,提高产量。在移栽后5 d施用20%分蘖氮肥的基础上,在倒二叶期追施30%的穗肥有利于形成良好的茎叶配置,提高后期光合物质生产量,从而获得较高产量;穗肥追施过早易使上部三片叶过长、叶片开张角过大,每穗粒数和粒叶比下降,后期物质生产量降低,产量降低;穗肥追施过晚不利于前期获得适宜的叶面积指数(LAI)和较高的物质生产量。
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