为探明在9.0万株/hm2高密度种植条件下旱地春玉米最佳的株行距配置,采用随机区组设计,12个处理(DH1.等行距40.0 cm,DH2.等行距50.0 cm,DH3.等行距60.0 cm,DH4.等行距70.0 cm,DH5.等行距80.0 cm,DH6.等行距90.0 cm,KH1.宽窄行(53.3 cm+26.7 cm),KH2.宽窄行(66.7 cm+33.3 cm),KH3.宽窄行(80.0 cm+40.0 cm),KH4.宽窄行(93.3 cm+46.7 cm),KH5.宽窄行(106.7 cm+53.3 cm),KH6.宽窄行(120.0 cm+60.0 cm)).3次重复,研究了行距配置对郑单958在旱地春播情况下产量和群体光合特性的影响.结果表明,随着行距的缩小,穗位叶SPAD值、穗位叶净光合速率、叶面积指数(LAI)、PAR截获率、单株干物质积累量、籽粒产量均提高;其中,50.0 cm+50.0 cm和66.7 cm+33.3 cm配置2年平均籽粒产量较90.0 cm+90.0 cm和120.0 cm+60.0 cm配置的平均产量提高24.3%,除2013年DH6处理产量显著高于KH6处理外,其余等行距处理和宽窄行处理之间产量无显著性差异.高密度条件下山西省春玉米最佳行距配置为50.0 cm+50.0 cm和66.7 cm+33.3 cm.%With the high-density of 90 000 plants/ha,the effects of row spacing on spring maize were studied.The experiment was conducted with random block design.There were 12 treatments in the test: DH1.40.0 cm+40.0 cm,DH2.50.0 cm+50.0 cm,DH3.60.0 cm+60.0 cm,DH4.70.0 cm+70.0 cm,DH5.80.0 cm+80.0 cm,DH6.90.0 cm+90.0 cm,KH1.The wide-narrow spacing 53.3 cm+26.7 cm,KH2.66.7 cm+33.3 cm,KH3.80.0 cm+40.0 cm,KH4.93.3 cm+46.7 cm,KH5.106.7 cm+53.3 cm,KH6.120.0 cm+60.0 cm.All treatments were repeated three times.The effects of row spacing on grain yield and photosynthetic characteristics were studied in this article.The results showed that with the reducing of row spacing,SPAD of ear leaf,Pn of ear leaf,LAI,as well as PAR capture ratio of corn and dry matter accumulation of corn and grain yield increased accordantly.The 50.0 cm+50.0 cm and 66.7 cm+33.3 cm treatments two years average grain yield increased by 24.3% than the treatments of 90.0 cm+90.0 cm and 120.0 cm+60.0 cm.There was no significant difference between row spacing and wide-narrow spacing except DH6 and KH6 in 2013.The results indicated that 50.0 cm + 50.0 cm and 66.7 cm + 33.3 cm was the best row spacing at higher plant density spring maize in Shanxi.
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