种植密度对郑单21玉米产量及品质的影响

Effects of Plant Population on the Grain Yield and Quality of Zhengdan 21 Maize Variety

2004年在河南省郑州市,以郑单21为试材,在30 000、45 000、60 000、75 000和90 000株/hm2种植密度下,研究了种植密度对郑单21玉米品种产量及子粒品质的影响。结果表明:郑单21的产量随着种植密度的增加先增后减,产量在60 000株/hm2达到最高的8 508 kg/hm2,淀粉含量同样是先增后减,在75 000株/hm2达到最高的74.78%,蛋白质含量表现为逐渐下降的趋势,油分含量表现为增-减-增的趋势,变化不大。高淀粉玉米郑单21不同种植密度产量及淀粉含量有一定差异。

The effects of plant population on the grain yield and quality of zhengdan 21 was studied under 30 000, 45 000, 60 000, 75 000, 90 000 plants/ha in Zhengzhou of Henan Province in 2004. The results showed that the grain yield increased first and then decreased with the add of the plant population. The grain yield reached supreme 8 508 kg/ha in 60 000 plants/ha, the grain starch contents increased first and decreased too. It reached supreme 74.78% in 75 000 plants/ha. The grain protein contents increased gradually with the add of plant population. The grain oil con- tents showed a curve of down-up-down with the add of the plant population.but it didn＇t change much. It is suggested that the effects of plan t population on the grain yield and the grain starch contents.