优质蛋白玉米中单9409高产群体质量指标研究

Studies on Population Quality Index for High Yield of QPM Hybrid Corn Zhongdan 9409

在宁夏引黄灌区间套种条件下 ,以中单 940 9为材料 ,以掖单 1 3号主栽品种为对照 ,通过肥密二因子均匀设计 ,研究中单 940 9的产量潜力 ,获取高产的肥密措施以及在高产条件下的群体调控质量指标。结果表明 :中单 940 9最高产量潜力为 75 1 3 kg/ hm2 ;相同肥密条件下 ,较对照掖单 1 3号减产 3 .66% ,产量与对照相近 ;适宜的高产肥密方案为 :播种密度 6.0～ 6.6万株 / hm2 ,全生育期追施尿素量 478.4～ 60 0 kg/ hm2 ,相应的产量为 71 0 7～ 72 63 kg/ hm2 。同时还对生育过程中根系伤流量、叶面积系数、干物质积累、产量构成等生理、光合指标进行了观察分析 ,并与对照品种掖单 1 3号作了比较 ,提出了中单 940 9高产栽培的调控指标 ,可作为优质蛋白玉米中单 940 9在本区生产上推广 。

In Ningxia irrigation area with inter planting condition, the experiments with densities and fertilizer levels designed by Evenness Method were carried out on QPM corn hybrid Zhongdan 9409 and contrasted with Local variety of Yedan 13, to evaluate the yield potentiality of Zhongdan 9409 and seek for optimization measurements and population quality index for high yield. The results showed that the potentiality yield could come to 7 513 kg/hm 2. At the same density and fertilizer level, the yield of Zhongdan 9409 was less than that of CK, down 3.66%, but if was not significantly lower. The optimization measurements for high yiields were density of 59.7%～65.8 thousand plants/hm 2 and growth duration top dressing nitrogen fertilizer urea of 478.4～600 kg/hm 2,with which photosynthesis such as root flux activity, leaf area index, dry matter accumulation and yield components were proposed, which could be used widely as diagnoses to control of the population growth of Zhongdan 9409 for high yield in Ningxia.