摘要
设置5个密度处理,2015～2016年研究种植密度对川中丘区夏玉米穗下茎节性状和抗倒伏力学特性的影响。结果表明,随群体密度增加,穗下由基部向上第2～5节节长增长;第3、5节7.50万株/hm^2密度处理较4.50万株/hm^2分别增加了19.04%、13.93%（2015）和22.84%和26.76%（2016）;第6～8节变化不显著,穗下各节节粗变细。节干重、单位茎长干物质重、穿刺强度和压碎强度均随密度的增加而降低。相关分析结果表明,茎秆倒伏率与茎秆节间直径、茎秆干重、单位茎长干物质重呈极显著负相关,与种植密度、节间长度呈显著正相关;与第3～5节和第8节（穗下第1节）穿刺强度和压碎强度均呈极显著负相关,茎秆压碎强度和外皮穿刺强度相关系数为r=0.96＊＊。
The effects of planting density on stalk and lodging-resistance of summer maize were studied with 5 density treatments in 2015 and 2016. Results showed that the more the planting density increased, the less the diameter of internodes below ear became. And with population density increasing, The length of the 2 nd-5 th internodes counted from maize plant base were increased, while the 6-8 th internodes did not change significantly. Moreover,the lengths of the 3 rd and 5 th internodes in the maximum density treatment（T5） were increased by 19.04, 13.93% in 2015 and 22.84 and 26.76% in 2016, respectively, when compared with that in the minimum density treatment（T1）. And with planting density increasing, some characteristics of maize internodes below ear, including dry weight,dry matter weight per unit length, rind penetration and crushing strengthes, were all decreased. Further, correlation analysis showed that stalk lodging rate was negative correlation with internode diameter, dry weight, and dry matter weight/length per unit length, as well as the rink penetration and crushing strengths in the 3-5 th and 8 th internodes（the 1 st internode below ear）, but it expressed significantly positive correlation with planting density and internode length. In addition, the crushing strength of stem and the puncture strength were also closely related with the correlation coefficient r= 0.96 ＊＊.
作者
马晓君
路明远
邢春景
莫太相
刘晓林
吴雅薇
袁继超
孔凡磊
MA Xiao-jun;LU Ming-yuan;XING Jing-chun;MO Tai-xiang;LIU Xiao-lin;WU Ya-wei;YUAN Ji-chao;KONG Fan-lei(Key Laboratory of Southwest Crop Physiology,Ecology and Farming,Ministry of Agriculture/College of Agronomy,Sichuan Agricultural University,Chengdu 611130;Beijing Shunxin Agriculture Co.,Ltd.,Belting 100097;Agrotech-nical Station of Zhongjiang County,Deyang 618100,China)
出处
《玉米科学》
CAS
CSCD
北大核心
2018年第4期118-125,共8页
Journal of Maize Sciences
基金
国家重点研发计划项目(2017YFD0301704,2016YFD0300307)
公益性行业(农业)科研专项经费(20150312705)
四川省玉米产业技术体系岗位专家项目
关键词
夏玉米
群体密度
抗倒力学
农艺性状
Summer maize
Population density
Lodging-resistance
Agronomic trait
