Effect of Leaf Source Reduction on Photosynthetic Properties and Yields of Densely Planted Maize
In order to investigate the effect of leaf source reduction on the photosynthetic performance and yield of maize under dense planting conditions,the main local cultivated maize variety Longping 206 was used as the experimental material,a single fac-tor random block experimental design was adopted,and a total of 4 different source reduction intensity treatments were set up.The changes of light transmittance,photosynthetic rate of ear position and yield of maize population after different source reduction treat-ments were measured and analyzed.The results showed that the light transmittance of base was lower than that of ear leaf under dif-ferent source reduction treatments,and the light transmittance of same canopy increased with the increase of leaf removal amount.The net photosynthetic rate of maize leaf at ear position could be increased by reducing the leaf source at an appropriate amount,while the net photosynthetic rate of maize leaf at ear position could be increased by reducing the leaf source at an excessive amount at a certain time,but it would decrease rapidly later,which was not conducive to the accumulation of photosynthetic products.Under different source reduction treatments,the maximum value of effective ear number,kernel number per ear,mass of 100 grains and yield of maize were 10.34×104 ears/hm2,429.55 grains/ear,33.42 g and 13 945.29 kg/hm2,respectively,under RL2 treatment.There-fore,it is recommended to remove 2 leaf sources for maize planting and production under dense planting conditions in Linqu area.
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