Yield advantage and carbon footprint of oat/sunflower relay strip intercropping depending on nitrogen fertilization

文献类型： 外文期刊

第一作者： Qian, Xin

作者： Qian, Xin;Qian, Xin;Zhou, Jie;Luo, Bolun;Hu, Yuegao;Zang, Huadong;Zeng, Zhaohai;Dai, Hongcui;Ren, Changzhong;Guo, Laichun;Wang, Chunlong;Peixoto, Leanne;Zamanian, Kazem;Zhao, Baoping

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关键词： N fertilization; Strip intercropping; Border row effect; Yield; Carbon footprint

期刊名称：PLANT AND SOIL （ 影响因子：4.993； 五年影响因子：5.44 ）

ISSN： 0032-079X

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收录情况： SCI

摘要： Purpose Increasing crop yield to ensure global food security while decreasing carbon footprint (CF) is a challenge for sustainable agriculture. Although intercropping is suggested as a potential pathway in this regard, the balance between yield advantage and CF is unclear, especially under different nitrogen (N) application rates. Methods A two-year field experiment was conducted to investigate the effect of oat/sunflower intercropping and N application rates (0, 50, 100, and 150 kg ha(-1)) on yield advantages, N uptake, and CF. Results The overall land equivalent ratio of oat/sunflower intercropping decreased from 1.33 to 1.07 with increasing N fertilization, which implies the potential N reduction to maintain crop yield. Without fertilization, the yield advantage of intercropping was 28-32% and 18-47% higher for oat and sunflower, respectively compared with corresponding monocultures. However, this yield advantage decreased with increasing fertilization, especially for oat. The border rows contributed more than one-third of the yield for intercropped oat without N fertilization, but their contribution decreased with increasing N fertilization. However, the contribution of border rows to intercropped sunflower yield was independent of N fertilization and remained around 69-75%. Overall, oat/sunflower relay strip intercropping maximizes the productivity by border row effects due to reduced N fertilization demand. Furthermore, intercropping decreased the CF relative to monoculture, especially without N fertilization. Conclusion Intercropping can act as a win-win strategy for sustainable agriculture in Northwest China with higher productivity and lower carbon footprint.

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