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" ... The researchers added different types of microplastics into the soil: polyamide beads (a primary microplastic), polyester fibers (the most common type of secondary microplastic) andĀ four different plastics in the form of fragmenta (another type of secondary microplastic). They added microplastics at a similar concentration to that of soils exposed to high levels of human activity. Then, they grew spring onions in soil with and without the different microplastic types. Here's what the scientists found: ... "