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Researchers compiled data from over 120 studies across China. They found that plastic films used in agriculture are a major source of both macro and microplastics polluting soils.

On average, there were over 100 kg of macroplastic fragments per hectare lingering in fields after harvest. These come from things like plastic mulch films and greenhouses. Meanwhile, microplastics were even more abundant, averaging over 4500 tiny plastic pieces per kg of dry soil.

The highest levels were in northern and north-western China, where plastic films are heavily used to boost crop yields in drier regions. But microplastics traced back to city sewage sludge and food compost were also present, especially in southern farmlands. 

This hidden build-up of plastic has concerning implications. Macroplastics can choke and suppress plant growth if left in fields. And microplastics can move up the food chain, passing from soil to crops to livestock and people. Their small size also allows microplastics to enter cells and tissues in living organisms, with largely unknown health effects.

The researchers point to biodegradable plastic films as one potential solution to reduce agricultural plastic waste. But better recycling programs and technology will also be key to tackling this unseen plastic pollution crisis.

The picture is now becoming clearer - plastic residues are silently accumulating where we grow our food. But understanding the scale of contamination is the first step to better protect farmland soils that sustain both crops and communities. Uncovering this hidden threat can help spur actions to curb plastic overuse and properly dispose of agricultural plastics in the future.