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USA: Boosting Soil Phosphorus with Biosolids

USA: Boosting Soil Phosphorus with Biosolids

Treated wastewater solids (called biosolids) are sometimes used by farmers to boost soil nutrient levels. Now research by the USDA observed that phosphorus levels were generally higher in the biosolid-amended soils (which had been amended 16 to 24 years previously) than in soils that didn’t receive the amendments. This strongly indicates that soluble phosphorus levels in biosolid-amended soils could exceed typical plant requirements for years after biosolids are added. Biosolids used in agriculture are processed to kill pathogens, and their use is strictly regulated to ensure that the materials don’t harm the environment, human health or animal health.

(Source: ars.usda.gov)