Eradicating hunger remains a pressing global challenge, and crop rotations emerge as a powerful strategy to address this issue while promoting sustainable agriculture. This meta-analysis reveals that transitioning from monoculture to crop rotations can significantly enhance yield, nutrition, and revenue, offering a triple win for farmers and global food security. But here's where it gets controversial: while legume pre-crops consistently boost yields by 23%, non-legume pre-crops also show a surprising 16% increase, challenging the notion that nitrogen-fixing legumes are always superior. And this is the part most people miss: crop rotations not only increase total yields by 23% but also improve dietary energy by 24%, protein by 14%, and micronutrients like iron, magnesium, and zinc by up to 27%. Revenue sees a 20% uplift, making it a financially viable option. However, the benefits vary by region and crop sequence, with some rotations outperforming others. For instance, maize-soybean and sorghum-soybean rotations in South America yield better results than continuous soybean monoculture. In contrast, switching from maize monoculture to soybean-maize rotation can lead to significant losses in dietary energy, micronutrients, and revenue. Should farmers prioritize legume-based rotations for their nitrogen-fixing benefits, or are non-legume rotations equally viable in certain contexts? This question sparks debate, as the choice depends on regional soil conditions, fertilizer use, and crop management practices. The study underscores the importance of tailored crop rotation strategies to maximize benefits while minimizing trade-offs, ultimately contributing to the UN Sustainable Development Goals of zero hunger and sustainable consumption. By adopting optimized rotations, regions like West & Southern Africa and South America can achieve yield, nutrition, and revenue gains exceeding 80%, offering a transformative pathway for global agriculture.
