Influence of maize planting density on the photosynthetic and growth characteristics of maize in the maize and soybean intercrops
[Objective]To elucidate the changes in the light environment of the maize canopy under dif-ferent planting densities in maize and soybean intercropping systems,and to clarify the effects of planting density on the photosynthetic characteristics,agronomic traits,and yield of intercropped maize,thus provid-ing a theoretical basis for constructing a reasonable maize population density in maize and soybean intercrop-ping system in the Londong Loess Plateau of China.[Method]The maize and soybean intercropping sys-tem was conducted with maize monoculture and soybean monoculture as the controls.Four intercropping maize planting densities of 52 500(M1),67 500(M2),75 000(M3)and 82 500 plants/hm2(M4)were estab-lished.The effects of planting density on the changes in the light environment,photosynthetic characteris-tics,plant growth characteristics,and yield of intercropped maize populations were studied.[Result]Com-pared with maize monoculture,intercropping significantly increased the light interception rate and leaf area index of maize canopy,maintained higher net photosynthetic rate of maize,and increased above-ground dry matter accumulation and yield of maize.At the silking stage,the light interception rate of the maize canopy in the M3 treatment increased by 9.12%,the leaf area index increased by 35.08%,the net photosynthetic rate increased by 12.56%,the dry matter accumulation increased by 15.98%,the yield increased by 9 309.78 kg/hm2,and the land equivalent ratio reached 1.70.[Conclusion]In this region and similar natural ecological areas,when maize and soybean are intercropped at a 4∶2 ratio,the maize density of 75 000 plants/hm2 is conducive to the formation of a good canopy light environment,which can achieve more dry matter ac-cumulation,thereby increasing maize yield and improving the intercropping advantage of the intercropping system.
maize and soybean intercroppinglight environmentphotosynthetic propertiesagronomic traitsyield
万方数据
维普
