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Understanding the sources of microplastics in agroecosystems
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Researchers challenged the widely held assumption that sewage sludge spread on farmland is the primary source of microplastics in agricultural soils, finding that unrecovered agricultural plastics such as mulch films likely contribute far more — suggesting pollution prevention efforts may be misdirected.
.truncate-component { position: relative; overflow: hidden; display: -webkit-box; line-clamp: 16; -webkit-line-clamp: 16; -webkit-box-orient: vertical; } .toggle-truncation-button { display: none; position: absolute; bottom: 0; right: 0; } Microplastics are plastic material that are less than 5 mm in diameter and are of great environmental concern. It is well established that microplastics are harmful to both terrestrial and aquatic organisms and can also serve as a vector for accumulating and transporting toxins. Several researchers have reported that biosolids from wastewater treatment plants (WWTP), which are used as fertilizers are the major source of microplastics to the agroecosystems. In this note, we make estimates from various plastics usage and disposal data to test a commonly accepted hypothesis that WWTP biosolids are the major source of microplastics in agroecosystems. Our results show that unrecovered agricultural plastics contributed to the microplastic load at a much higher level than WWTP biosolids, thus falsifying the hypothesis. We recommend that the use of biodegradable/compostable plastics, detention ponds to trap microplastics present in agricultural runoffs, and policy changes to reduce and recycle plastic usage to mitigate the impacts of microplastics in agroecosystems. ... Read more
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Unravelling the emerging threats of microplastics to agroecosystems
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This review synthesizes evidence that microplastics accumulate in agricultural soils from multiple pathways, disrupting soil physical and chemical properties, shifting rhizosphere microbial communities, and potentially entering plants through water and nutrient uptake channels. Because most microplastic research has focused on aquatic systems, the effects of soil MP contamination on crop yield, food quality, and long-term agricultural sustainability remain critically underexplored.
Ecological Impacts and Toxicity of Micro- and Nanoplastics in Agroecosystem
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Researchers assessed the ecological impacts of micro- and nanoplastics in agricultural environments, finding that these sub-millimeter and sub-micron polymer fragments act as environmental pollutants that disrupt soil health and pose risks to plant and animal life in farming systems.
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This paper examines methods for extracting, identifying, and quantifying microplastics from biodegradable bioplastics used in agriculture, which fragment into particles that are difficult to distinguish from conventional microplastics. Understanding whether bioplastics truly degrade safely is vital, as agricultural microplastic contamination of soil directly affects food crops consumed by humans.
Hazards of Microplastic Pollution in Agriculture
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This review examined the sources and hazards of microplastic pollution in agricultural settings, including plastic mulch degradation, sewage sludge application, and plastic packaging, and their effects on soil health and crop systems. Agricultural microplastic exposure is especially significant for human health because it creates a direct farm-to-table contamination pathway, with particles and leached chemicals potentially present in vegetables, grains, and livestock products.
Microplastics in Terrestrial Ecosystems
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This review assessed microplastic accumulation in terrestrial ecosystems — including agricultural soils, forests, and urban environments — documenting effects on soil structure, earthworm health, plant growth, and microbial diversity driven by decades of dramatic plastic production growth. Because terrestrial environments receive far more microplastic deposition than oceans yet are less studied, the soil contamination documented here directly threatens food production and represents a major underappreciated source of human dietary microplastic exposure through crops and soil-grown produce.
Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.