种植密度与施氮水平对优质蛋白玉米中单9409产量及子粒粗蛋白质含量的影响

在3种种植密度和4种供氮水平下研究了种植密度和施氮量对中单9409产量及子粒粗蛋白含量的影响.种植密度和施氮量均对优质蛋白玉米中单9409的子粒粗蛋白质含量有显著影响,且二者互作效应显著.种植密度之间,以最高产量对应的种植密度的粗蛋白质含量最低,子粒粗蛋白质含量随种植密度的变化动态受施氮量的影响;施氮对子粒粗蛋白质含量的影响与种植密度有关,低密度下,以中等施氮量处理的粗蛋白质含量最高,高密度下,则以中等施氮量处理的粗蛋白质含量最低.本试验条件下玉米子粒粗蛋白质含量与产量呈显著负相关,与穗粒数、百粒重、穗粒重均呈显著正相关;与粗脂肪、粗淀粉含量均呈负相关,但与粗脂肪含量相关不显著.

Effects of Plant Population and Nitrogen Rate on the Yield and Grain Protein Contents of QPM (Quality Protein Maize) Hybrid Zhongdan 9409

The effect of plant population and nitrogen rate on the yield and grain protein contents of QPM(quality protein maize)hybrid Zhongdan9409was studied under three level of plant population and four nitrogen rates.The result showed that both the effect and interaction effect of plant population and nitrogen rate on the grain protein contents were significant.The plant population which had highest yield presented lowest grain protein con-tents,and the effects of plant population or nitrogen rate was affected each other.Under the low plant population the highest grain protein contents presented at middle nitrogen rate,while under higher plant population and middle ni-trogen rate it presented the lowest.The correlation analysis showed that the grain protein contents had a significant negative relation with yield,a significant positive relation with grain weight per ear,grain number per ear and1000-grain weight,and a negative relation with grain starch contents and oil contents,but the relation with grain oil con-tents was not significant.