Legume Genomics and Genetics 2025, Vol.16, No.6, 288-296 http://cropscipublisher.com/index.php/lgg 293 7.2 Comparison of mulched vs. non-mulched broad bean plots over two seasons The materials are laid out first: plastic film, wheat straw, field grass clippings - several methods of covering are mixed together. After two growing seasons, the plots with film have high moisture, vigorous seedlings, and the yield is steadily higher than the fields without film. Having said that, there is a ceiling for relying on a single film, so one team also spread some phosphorus fertilizer and added some humic acid to see if the "stacked package" can push it up further (Jasim & Alghrebawi, 2020). The result? It is certain that water retention is more sufficient, but as for which is more cost-effective, investment or increased production, it still needs to be carefully calculated. 7.3 Observed outcomes: germination success, moisture metrics, and yield results The mulched ground has a more stable surface temperature and more moisture in the soil, so the emergence rate is higher and the seedlings grow more vigorously. Mulching can significantly increase the water retention capacity of the soil, reducing irrigation requirements by up to 25%, while reducing salinity and increasing water use efficiency by about 50% (Katab et al., 2008). In some cases, mulching has increased broad bean yields by 70% to 80% compared to unmulched controls (Kang et al., 2020). In addition, mulching can increase pod number, seed weight and total biomass; when this method is used in conjunction with appropriate nutrient management, the benefits are more obvious and the yield increase is more stable. 8 Future Directions and Research Needs 8.1 Development of eco-friendly and cost-effective mulching materials Traditional plastic films will pollute the soil after long-term use and leave a lot of microplastics. In order to alleviate these problems, people are working hard to develop degradable and renewable mulch films (Feng et al., 2015). New methods include making natural polymers such as lignin into thin films, or degradable films that are light-transmitting and waterproof. However, there are still many difficulties in making these new films easy to use and cheap in the fields, and also widely promoted (Mormile et al., 2019). Next, we need to continue research: first, improve the degradation process, second, measure the toxicity of the decomposed substances, and third, see whether they work well in different soils and climates (Huang et al., 2024). 8.2 Integration with precision irrigation and climate-smart practices First, farmers complained: the film is a good thing, but water is still tight. So the research team simply added precision drip irrigation to the lineup - sensors monitor soil moisture, valves open and close in seconds, and the goal is to press every drop of water on the roots (Li et al., 2025). However, paper deductions are deductions, and the conditions in the field vary greatly. Zhao et al. (2023) are busy building a coupling model, and how the water, heat, and nutrients in the soil move are all moved to the computer; but in order to prevent the model from "floating", it must be fed with field monitoring and a bunch of big data. When the film, smart irrigation, and weather forecasts are all connected to the same dashboard, farmers may be able to save water and labor by clicking on the screen, and they are not afraid of weather changes. 8.3 Long-term field trials and soil impact monitoring After one year of testing, the conclusions are often mixed; only after five or ten years of data are accumulated can we know what the film has done to the soil. Jin et al. (2022) mentioned: Don’t just focus on yield, soil health, microplastics, and ecological services must all be accounted for. So, a team buried sensors at different depths and took samples every time the season changed. The data will tell which is better, traditional membrane or degradable membrane (Jin et al., 2024). The difficulty lies in detection: the old method cannot pick up fragmented residual membranes, and microbial changes cannot be accurately grasped. Only by upgrading equipment and changing analytical methods can the details of residues and nutrient cycles be picked out, so that policymakers can have a clear idea when making decisions (Schaefer et al., 2016; Sander, 2019). 9 Concluding Remarks Film covering can make the ground warmer and wetter, which is particularly helpful for seed germination and early seedling growth, especially in fields with dry, cold or changeable weather. After covering with film, soil moisture is retained for a longer time, the temperature is more stable, the germination rate is high, the root system
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