Journal of Northern Agriculture ›› 2025, Vol. 53 ›› Issue (5): 15-24.doi: 10.12190/j.issn.2096-1197.2025.05.02

• Crop genetics and breeding. Corp cultivation • Previous Articles     Next Articles

Effects of strip intercropping on soybean growth,development,and yield in saline-alkali land of Hetao Irrigation District

ZHAO Xiaoyu1, LIU Kunyu1, GAO Yuanli1, WANG Xuejiao1, DU Erxiao1, WU Juan1, LI Wei2, DONG Yuheng1, SU Erhu1, LI Qiang1   

  1. 1. Inner Mongolia Academy of Agricultural & Animal Husbandry Sciences,Hohhot 010031,China;
    2. Inner Mongolia Autonomous Region Water Conservancy Research Institute,Hohhot 010052,China
  • Received:2025-02-10 Online:2025-10-20 Published:2026-01-20

Abstract: 【Objective】 To clarify the effects of strip intercropping in saline-alkali land of the Hetao Irrigation District,Inner Mongolia,on soybean growth,development,and yield,thereby improving the utilization rate of saline-alkali cultivated land. 【Methods】 A maize-soybean strip intercropping experiment(4 rows of maize+4 rows of soybean)was conducted in Bayannur City,Inner Mongolia,from 2023 to 2024 using four soybean varieties—Heinong 81,Mengkedou 15,Mengkedou 25,and Suinong 71(180 000 plants/hm2)to analyze the variation patterns of agronomic traits,photosynthate production capacity,quality,and yield among different soybean varieties under saline-alkali land strip intercropping conditions,aiming to determine the effects of strip intercropping in saline-alkali land on soybean growth and development.【Results】 Over the two years,Mengkedou 15 exhibited the highest plant height(107.50 and 104.77 cm,respectively),was significantly higher than that of the other varieties(P<0.05);the lowest pod height was the shortest(11.33 and 11.58 cm,respectively),was significantly lower than that of the other varieties(P<0.05);the effective pod number per plant was the highest(15.24 and 15.85 pods,respectively). Over the two years,leaf SPAD values of the different soybean varieties gradually increased as the soybean growth stage progressed,reaching their maximum at the full seed to full maturity stage,with Mengkedou 15 being significantly higher than the other varieties(P<0.05),measuring 42.83 and 43.23,respectively. The leaf area index showed a pattern of first increasing and then decreasing as the growth stage progressed,reaching its maximum at the full seed(R6)stage,with Mengkedou 15 significantly higher than the others(P<0.05),measuring 3.31 and 3.41,respectively. Dry matter accumulation gradually increased as the growth stage advanced,peaking at the full maturity(R8)stage,with Mengkedou 15 being significantly higher than the others(P<0.05),measuring 940.21 and 945.37 g/m2,respectively. Suinong 71 had the highest protein content(39.98% and 40.21%). Mengkedou 15 had the highest fat content(22.58% and 22.67%)and total protein and fat content(58.73% and 58.26%). Soybean yield was highest for Mengkedou 15(1.53 and 1.59 t/hm2,respectively). Correlation analysis showed that soybean yield was highly significantly positively correlated with SPAD value and dry matter accumulation(P<0.01),with correlation coefficients of 0.97 and 0.96,respectively,and significantly negatively correlated with the lowest pod height(P<0.05),with a correlation coefficient of -0.87.【Conclusion】 Strip intercropping in saline-alkali land of the Hetao Irrigation District significantly affects soybean SPAD value and dry matter accumulation,consequently affecting soybean yield. Among the tested varieties,Mengkedou 15 showed the best performance in agronomic traits and yield and is suitable for maize-soybean strip intercropping in this region.

Key words: Hetao Irrigation District, Saline-alkali land, Strip intercropping, Soybean, Agronomic traits, Quality, Yield

CLC Number: 

  • S565.1