不同密度对玉米‘郑单2098’产量及构成因素的影响

Effects of Planting Density on Yield and Its Composition Factors of Maize ‘Zhengdan 2098'

为研究密度对玉米‘郑单2098’产量及其构成因素的影响,探讨不同肥力水平下‘郑单2098’的最佳栽培密度。以‘郑单2098’为材料,在河南省西华和长葛两地研究了不同地力、不同密度对‘郑单2098’产量及相关性状的影响。结果表明:随着密度增加,产量先增后减,株高、穗位高、空秆率、秃尖增加,穗长、穗粗、行粒数、双穗率、穗粒重、百粒重减少,出籽率相对稳定;‘郑单2098’在中肥力水平下,随着密度的增加影响产量主要因素是穗行数和秃尖,而在高肥力水平下,随着密度的增加影响产量主要因素是穗粒重和百粒重。‘郑单2098’在中肥力水平下,适宜种植密度为5.25万株/hm2左右;在高肥力水平下适宜种植密度为6.75万株/hm2左右。

In order to explore the effect of planting density on yield and its composition factors,and study the optimum planting density under different fertility levels of‘Zhengdan 2098＇,the experiments were conductedin Xihua and Changge of Henan Province using‘Zhengdan 2098＇as the material. The results showed that withthe density increase,the yield first increased and then decreased,the plant height,ear height,ratio of emptystalk,bald tip all increased,while the ear length,ear diameter,particle number,double spike rate,ear grainweight,100-grain weight decreased,and the shelling percentage was relatively stable. With the densityincrease,the number of rows per ear and bald tip were main influence factors on yield of‘Zhengdan 2098＇under the middle fertility level,and the ear grain weight and 100-grain weight were main influence factors onyield of‘Zhengdan 2098＇under the high fertility level. The optimum planting density of‘Zhengdan 2098＇was 52500 plants/hm^2 under middle fertility level,and the optimum planting density of‘Zhengdan 2098＇was67500 plants/hm^2 under high fertility level.