Microplastic (MP) contamination in soil has attracted much attention, and increasing evidence suggests that MPs can accumulate in agricultural soils through fertilization by compost. In addition, the most common raw materials for composting are livestock and poultry manure wastes. Because the presence of MPs may threaten the safe utilization of fertilizers composted by livestock and poultry wastes during crop planting, it is necessary to understand the contamination risk of MPs present in livestock and poultry manure. In this study, the distribution of MPs in 19 livestock and poultry farms with 3 different species was investigated by using FTIR microscopy. A total of 115 items manure MPs and 18 items feed MPs were identified as PP and PE types dominated by colorful fragments and fibers. Furthermore, after comparing the compositions of plastic products used in the feeding process, we proposed two transport pathways for MP pollution in manure and one potential transport pathway in feeds. Our result proved that the application of swine and poultry manure directly could be a new route of MPs in agricultural soil, furthermore, the presence of MPs could threaten the safety of resource utilization in agricultural soil by using swine and poultry manure for manure potentially. Not, only that, our study also provided a reference for the remediation of MP-contaminated soil.

土壤中的微生物（MP）污染已引起广泛关注，越来越多的证据表明MPs可以通过堆肥施肥在农业土壤中积累。此外，用于堆肥的最常见原材料是畜禽粪便废物。由于MP的存在可能会威胁农作物种植期间畜禽粪便堆肥肥料的安全利用，因此有必要了解畜禽粪便中MP的污染风险。在这项研究中，通过FTIR显微镜调查了19种不同类型的19家畜禽场中MP的分布。共有115项肥料MP和18项饲料MP被确定为以彩色碎片和纤维为主的PP和PE类型。此外，在比较了饲喂过程中使用的塑料产品的成分后，我们提出了粪便中MP污染的两种运输途径和饲料中的一种潜在运输途径。我们的结果证明，直接使用猪和家禽粪便可能是在土壤中施用MP的新途径，而且，MP的存在可能会潜在地威胁使用猪和禽粪作为肥料的农业土壤资源利用的安全性。不仅如此，我们的研究还为MP污染土壤的修复提供了参考。MPs的存在可能通过使用猪和家禽粪便作为肥料来威胁农业土壤资源利用的安全性。不仅如此，我们的研究还为MP污染土壤的修复提供了参考。MPs的存在可能通过使用猪和家禽粪便作为肥料来威胁农业土壤资源利用的安全性。不仅如此，我们的研究还为MP污染土壤的修复提供了参考。