| The experiment was carried out at Xinji Experimental Station of Hebei Agricultural University in 2019.The effects of row spacing configuration(60cm+60cm and 40cm+80cm)and intercropping(Xianyu 335/Xianyu 688 and Xianyu 335/Zhengshan 958)on the yield of maize with different genotypes were studied.The main results show that:1.Compared with the equal-spacing treatment,the five Xianyu series of the wide-narrow xianyu series have higher net photo synthetic rates than the equal-spacing treatment,and the wide-narrow xianyu 1140 and xianyu 1366 have higher net photosynthetic rates than the equal-spacing treatment.Compared with 17.2%and 11.3%,Xianyu 1140 showed a significant difference.The five varieties of the Xianyu series all increased the canopy light transmittance under the wide and narrow row treatments.Among them,Xianyu 1366 had the largest canopy light transmittance,and the light transmittance of the bottom layer and the ear level layer were increased by 23.1%and 23.1%respectively.7.2%,wide and narrow row treatment increased the net photosynthetic rate and canopy light transmittance of corn.2.Compared with the equal row spacing treatment,the wide and narrow row treatment increased the yield of all corn varieties.Among them,the Xianyu 1140 and Xianyu 1366 increased the highest yield,and the wide and narrow row treatment increased the sum of the ears of Xianyu 1140 and Xianyu 1366.The number of ears per ear,the number of ears of the two varieties increased by 2.2%and 5.7%,the number of ears per ear of the two varieties increased by 16.1%,5.2%,the number of rows and grains of Xianyu 1140 increased the most,an increase of 12.1%,while the number of rows per ear was not Significant difference.Under equal row spacing and wide and narrow row treatments,Xianyu 1366 showed the highest yield.The main reason for the high yield of Xianyu 1366 was its high number of grains per ear and 100-grain weight.3.Compared with the single cropping treatment,the net photosynthetic rate of the intercropping treatment increased,and the intercropping Xianyu 335/Xianyu 688 increased 0.6%and 1.9%respectively compared with the single cropping,but the difference was not significant.Compared with monocropping,the Xianyu 335/Xianyu 688 intercropping increased the light transmittance of the canopy,and the light transmittance of the ear layer increased by 24.5%.4.Compared with the Xianyu 335 and Xianyu 688 monocropping treatments,the intercropping of Xianyu 335 and Xianyu 688 showed that the yield of corn population increased.The main reason for the increase in grain yield of maize population after intercropping was the increase in population ear number,which increased by 10.8%,while the number of ears and 100-kernel weight did not show superiority.5.Under wide and narrow row planting(40cm+80cm),corn leaf area index(LAI)increased by 0.3%～2.5%,net photosynthetic rate(Pn)increased by 0.3%-17.2%,relative chlorophyll content(SPAD)increased 2.9%-12.4%,the light energy utilization capacity is enhanced,which provides a guarantee for the formation of grain yield;in intercropping Xianyu 335/Xianyu 688,the leaf area index(LAI)increased by 8.8%～10.5%compared with single cropping.The relative content of chlorophyll(SPAD)increased by 0.6%to 3.2%.Through this study,row spacing arrangement and intercropping planting increased the canopy light transmittance and net photosynthetic rate of summer maize,resulting in an increase in yield.In row spacing configuration,the wide and narrow rows(40cm+80cm)Xianyu 1140 and Xianyu 1366 have high yields.The intercropping Xianyu 335/Xianyu 688 performed well and was suitable for planting in the Huanghuaihai Plain.This study provides technical support for the increase and efficiency of corn production in Hebei Province. |
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