不同种植密度对夏玉米产量、叶面积指数和干物质积累的影响

摘要

The purpose of this research is to explore the effects of different planting densities on the grain yield , LAI and dry matter accumulation of summer maize , and provide theoretical basis and technical support for the further enhancement of per unit ar -ea yield of summer maize.Maize varieties TT 33, TT 55 and ZD 958 were used as experimental materials , and six planting densities (6.00 ×104 , 6.75 ×104 , 7.50 ×104 , 8.25 ×104 , 9.00 ×104 , and 9.75 ×104 plant/hm2 ) were set.The results showed that the grain yield of maize significantly increased with the increase in planting density within limits ;while it gradually decreased with the increase in planting density beyond a certain value .The LAI increased with the increase in planting density , and it reached a peak at silking stage, and then began to reduce .The total dry matter accumulation significantly increased as planting density gradually in -creased.In conclusion, under this experimental field conditions , the appropriate planting densities of TT 33, TT 55 and ZD 958 were about 8.25 ×104, 8.25 ×104 and 7.50 ×104 plant/hm2 respectively.%为探讨不同种植密度对夏玉米产量、叶面积指数及干物质积累的影响，为进一步突破夏玉米单产提供理论依据和技术支撑，以天泰33、天泰55和郑单958为试验材料，设置6．00×104、6．75×104、7．50×104、8．25×104、9．00×104、9．75×104株／hm26个种植密度。结果表明：在一定范围内，随着种植密度的增加，玉米籽粒产量显著提高，超过某一密植条件，产量逐渐降低。叶面积指数随种植密度增大而增大，在吐丝期达到高峰，然后开始下降。随着种植密度逐渐增加，群体干物质积累量显著增加。天泰33和天泰55的适宜种植密度为8．25×104株／hm2左右，不超过9．00×104株／hm2；郑单958在密度7．50×104株／hm2左右较为适宜。