紧凑大穗型玉米品种陕单902适宜密度与产量潜力的研究

The Study on Suitable Density and Yield Potential of Shaandan 902 of Compact and Big Ear Maize

通过 4年 2个试验点的密度定额试验表明 ,密度对紧凑大穗型玉米品种陕单 90 2的有效总花数影响较小 ,而对穗粒数、成粒率影响较大 ,籽粒产量的提高与成粒率、穗粒数和群体总粒数的增加密切相关 ,其适宜种植密度一般不应超过 5 2 5 0 0株 / hm2 ,产量最高时最大叶面积系数可达到 4 .70 ,作物生长率为 1 9.80 g/ m2 · d,光能截获量可达到 90 % ,吐丝至成熟期干物质提高 1 kg,陕单 90 2籽粒产量可增加 0 .6 35 6 kg。

Through spend four years on test of density in two site, it is founded that effect of dedsity is little on effective sum flowers, great on grains per spike and rate of formed grain. It is correlation with increasing of rate of formed grains and grain per spike and colony sum grain that yield of grain is enhanced. It's suitable density is not more 52 500 plants/hm 2. When yield is up most,biggest leaf area index is 4.70,plant growth ratio is 19.80 g/m 2·d, energy of intercept and capture quantity is 90%. When dry matter is increased 1kg during silking stage to mature stage,grain yield of shaandan 902 is enhanced 0.6356 kg.