Legume Genomics and Genetics 2025, Vol.16, No.6, 288-296 http://cropscipublisher.com/index.php/lgg 292 will also cost money. In other words, when choosing which film to choose, you must not only focus on the increase in production in front of you, but also take into account the environmental costs and possible policy changes in the future, and calculate them all according to the actual local conditions. This is considered smart. 7 Case Study in Place 7.1 Study region: climate, soil type, and agronomic background Let’s not talk about the results right away. The location already tells us a lot. The Loess Plateau in northwest China-strong winds and little water, the ground is white all year round; the winter farming belt in Wasit, Iraq-rain comes and goes as it pleases. Such places are perfect for measuring “water retention” (Jasim and Al-Amiri, 2020). However, the soil fertility in the same experimental grid varies greatly: one end is old land that has been worked hard, while the other end still has some base fertilizer. Some farmers simply rotate broad beans and potatoes to make the soil looser and the harvest less likely to drop every year (Figure 2) (Shi et al., 2023). Figure 2 Geographic location of the study site a and experimental design b. PC, potato continuous cropping without film mulching; PCF, potato continuous cropping with film mulching; R1, potato-broad bean rotation without film mulching; R1F, potato-broad bean rotation with film mulching; R2, potato-pea rotation without film mulching; R2F, potato-pea rotation with film mulching (Adopted from Shi et al., 2023)
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