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Identifying the Influencing Factors of Plastic Film Mulching on Improving the Yield and Water Use Efficiency of Potato in the Northwest China
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This meta-analysis found that plastic film mulching increased potato yield by 25-30% and improved water use efficiency in water-scarce Northwest China. The benefits varied by precipitation level, fertilizer application, and mulching method, providing guidance for optimizing this widely used agricultural practice.
Potato is an important crop in the Northwest China, however, its production is constrained by water scarcity. Plastic mulching film is an efficient technical measure to alleviate potato production restrictions. Therefore, studying the response of potato yield and water use efficiency to plastic mulching film is of great significance. The study conducted a meta-analysis to quantify the effect of plastic film on potato yield and water use efficiency in the Northwest. The study then quantified the effects of different levels of natural conditions (mean annual precipitation, mean annual accumulated temperature ≥ 10 °C), fertilizer application (nitrogen fertilizer, phosphate fertilizer, potassium fertilizer), cultivation measures (planting density, cultivation method, mulching method), and mulching properties (mulching color, mulching thickness) through subgroups analysis. Finally, the random forest model was used to quantify the importance of factors. Plastic film mulching increased yield by 27.17% and water use efficiency by 27.16%, which had a better performance under relatively lower mean annual precipitation, low mean annual accumulated temperature ≥ 10 °C, relatively lower fertilizer application, planting density of 15,000–45,000 plants·ha−1, ridge, and black mulching. Natural conditions, fertilization measures were vital to improve productivity. The research results can provide reference for agricultural management strategies of potato cultivation using plastic film in the Northwest China and other potato-producing areas.
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A field experiment on the Loess Plateau found that combining plastic film mulch with straw mulch regulated soil temperature and extended the grain-filling period of rainfed maize, preventing premature senescence and improving yields. The study highlights a trade-off in dryland agriculture: plastic mulch conserves moisture but overheats soil, while novel double-mulching patterns can mitigate the temperature problem while still relying on plastic film.
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Researchers compared five mulching treatments in dryland potato farming in Northwest China over two growing seasons, finding that both plastic and straw mulches improved soil moisture retention, aggregate stability, and tuber yield by roughly 12%, with straw strip mulching offering an environmentally preferable alternative to plastic film.
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