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在相同密度下研究了7个不同品种从边1行至边5行玉米产量性状的变化。结果表明,从边1行至边5行,单株产量、穗粒数、百粒重逐渐减小,不同品种单株产量、穗粒数、百粒重随边行增加而递减的速度不一样,一般到边3行时减小的速度变缓。穗粒数的减少和百粒重的降低导致了单株产量的降低,穗粒数的减少是单株产量降低的主要因素,边际效应较小的品种单株产量降低的主要因素是百粒重的降低。
Under the same density, the changes of yield characters of seven different varieties from side 1 to side 5 were studied. The results showed that from side 1 to side 5, the yield per plant, the number of grains per ear and the weight of 100 grains decreased gradually. The yield per plant, the number of grains per ear, , Generally slow down to reduce the speed of the side 3 lines. The decrease of grain number per spike and the decrease of 100-grain weight led to the decrease of yield per plant, and the decrease of number of grains per spike was the main factor of yield per plant. The main factor of decrease of yield of plant with smaller marginal effect was 100-grain weight The reduction.