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以沈爆3号为对照,对2个爆裂玉米组合在5个密度下对其产量、叶面积指数、叶绿素含量、净光合速率、叶向值等进行研究。结果表明,玉米产量随密度的增加一直呈上升趋势,在8.25万株/hm2密度下沈爆1273产量最高,为5 596.0 kg/hm2,两个组合分别比沈爆3号增产22.5%和11.1%,表现出高度耐密性和良好的丰产稳产性;两个组合的叶面积指数较大、最大叶面积指数维持时间较长;叶绿素含量尽管随密度增加而下降,但下降幅度均较小;不同组合间净光合速率存在较大差异,且下降速率对密度的反应因组合而不同;组合间的叶向值存在较大差异,在高密度下其叶向值的自动调节能力在组合间也表现不同。产量最高的组合沈爆1273,具有叶面积指数较大和最大叶面积指数持续时间较长,较强的株形自动调节能力特征,使其在高密度下维持较高的叶绿素含量、净光合速率以及在高密度下维持较高光合速率的能力是其高产的生理基础。
Taking Shen-2 as control, the yield, leaf area index, chlorophyll content, net photosynthetic rate and leaf orientation of the two popcorn combinations were studied under five densities. The results showed that the yield of maize increased with the increase of density. The yield of detonated 1273 at the density of 8.25 thousands plants / hm2 was the highest, which was 5 596.0 kg / hm2. The yield of maize increased by 22.5% and 11.1% , Showing a high density and good yield stability; two combinations of larger leaf area index, the largest leaf area index to maintain a longer time; although the chlorophyll content decreases with increasing density, but the decline is small; different There was a big difference in the net photosynthetic rate among the combinations, and the response of the rate of decline to the density was different due to the combination. There was a big difference in the leaf-orientation values between the combinations, and the ability of the leaf- different. The highest yielding combination Shen-Shui 1273 had the characteristics of longer leaf-shape index and longer maximum leaf area index, which could maintain high chlorophyll content, net photosynthetic rate The ability to maintain high photosynthetic rates at high densities is the physiological basis for its high yield.