Maize–soybean intercropping can improve land use efficiency and increase crop yields, thereby contributing to sustainable agricultural development. This study aimed to investigate the marginal effects of intercropping on dry matter accumulation and the extinction coefficient (K) of
maize and
soybean canopies, thereby providing
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Maize–soybean intercropping can improve land use efficiency and increase crop yields, thereby contributing to sustainable agricultural development. This study aimed to investigate the marginal effects of intercropping on dry matter accumulation and the extinction coefficient (K) of
maize and
soybean canopies, thereby providing theoretical guidance for efficient resource utilization and the realization of high-yield and high-efficiency
maize–soybean intercropping systems. This experiment employed
maize variety Jincheng 316 and
soybean variety Heinong 531. Two intercropping treatments (S4M4: four rows
soybean alternating with four rows
maize; S6M4: six rows
soybean alternating with four rows
maize) and two sole cropping controls (M: sole
maize; S: sole
soybean) tested the marginal effects of different intercropping patterns on crop dry matter accumulation, SPAD, and K. Combined with analyses of yield, land equivalent ratio (LER), and intercropping advantage (IA), we determined the optimal row ratio configuration for intercropping. The results showed that, compared with monocropped
maize, the leaf SPAD at the R1 stage and grain dry matter accumulation at the R6 stage under S4M4 and S6M4 treatments increased by 17.28%/20.12% and 8.07%/5.35%, respectively, while K values decreased by 21.80% and 14.37%. For
soybean, relative to monocropping, the R4 leaf SPAD and R8 grain dry matter accumulation under S4M4 and S6M4 were elevated by 23.87%/19.40% and 26.66%/13.56%, respectively, with corresponding K values reductions of 21.94% and 21.82%. Moreover, S4M4 exhibited a 51.67% higher IA and a 9.48% higher LER than S6M4. In summary,
maize–soybean intercropping significantly boosts dry matter accumulation and resource use efficiency, with the S4M4 configuration exhibiting the most distinct advantages.
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