Effect of Planting Density on Mixed Silage Yield and Crop Resistance Characteristics of Soybean-Maize Strip Intercropping in the Northern Border Irrigation Area
[Objective]In response to the problem of rich light resources but single silage planting in the northern border irrigation area,the superior characteristics of maize-soybean strip mixed intercropping system is utilizes to control,the silage yield by adjusting different maize-soybean densities in the north-ern border irrigation area,which provides a reference of suitable density cultivation for local silage inter-cropping planting.[Method]Three density treatments were set up for maize:90 000 plants/hm2(M1),105 000 plants/hm2(M2),120 000 plants/hm2(M3),and three density treatments were set up for soy-bean:150 000 plants/hm2(S1),180 000 plants/hm2(S2),210 000 plants/hm2(S3).The agronomic traits,synthetic potential,stalk lodging resistance and silage yield of maize soybean under different density treatments were studied.[Result]As maize plant density rose from 90 000 to 120 000 plants/hm2,stem puncture strength decreased by an average of 17.30%～25.72%,fall rate increased by an average of 51.13%～55.27%,leaf area index(LAI)increased by an average of 8.00%～22.82%,photosynthetic po-tential(LAD)increased by an average of 10.49%～29.49%,and yield showed a trend of increasing and then decreasing,peaking at 105 000 plants/hm2,and the soybean plant height and fall rate also in-creased with higher maize planting density.Soybean plant height and collapse rate showed an increasing trend with the increase of maize planting density,soybean canopy light transmission rate,stem thickness and folding resistance showed a decreasing trend,and LAI and LAD showed an increasing and then de-creasing trend.Under low,medium,and high density treatments of maize,soybean high-density intercrop-ping decreased flexural strength by 18.71%to 29.83%,19.68%to 36.94%,and 20.48%to 31.74%,and increased the rate of collapse by 9.77%to 48.50%,9.82%to 66.24%,and 2.25%to 35.80%,respec-tively,when compared with low and medium density intercropping.With the increase of soybean planting density,soybean LAI,LAD and yield increased,and the collapse rate decreased significantly.The mixed silage yield of the M2S3 intercropping system was the highest,reaching 64 981.84 kg/hm2,2.81%more than the M2S1 treatment.[Conclusion]Overall,105 000 plants/hm2 for maize and 210 000 plants/hm2 for soybeans favors improved crop resistance and population light distribution,which in turn improves the mixed silage yield advantage.
north border irrigation districtmaize-soybean strip intercroppingdensitylodging resistancemixed silage yield
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