【摘要】 以玉米新品种诺达1号为供试材料,研究不同种植密度对玉米叶面积指数、干物质积累及产量的影响。结果表明:在60 000~82 500株/hm~2密度范围内,随种植密度增加玉米产量显著增加,但当密度达到一定程度后,产量又随密度增加而降低,产量和密度符合二次曲线关系;叶面积指数随种植密度增大而增大,在灌浆期达到最大值,而后下降;玉米在个体和群体层次上的干物质积累均呈"S"型动态,单株干物质积累量随种植密度的加大而减少,群体干物质产量在一定密度范围内随种植密度增加而增加,诺达1号的种植密度超过82 500株/hm~2时,群体干物质积累量不再增加。更多还原

【Abstract】 The new maize hybrid Nuoda 1 was studied under different planting densities to investigate their effects on yield,leaf area index( LAI) and dry matter accumulation. The results showed that the yield of maize significantly increased with the increase of planting density in the range of 60 000 ~ 82 500 plants / hm~2,while it gradually decreased with the increase of planting density beyond a certain value. The yield presented a conical relationship with planting density. The LAI increased with the increase of planting density,and reached the peak at the filling stage and then began to reduce. The dynamics of maize dry matter accumulation of single plant and population both showed "S"curve. The dry matter accumulation of single plant decreased with the increase of planting density,while that of population increased with the increase of planting density within limits. The dry matter accumulation of population no longer increased when the planting density was more than 82 500 plants / hm~2.更多还原