Answer:
Explanation:
Farmers use fertilizers because these substances contain plant nutrients such as nitrogen, phosphorus, and potassium.
A. Because phosphorus is limited so adding it allows for more plant growth.
farmers replenish the phosphorus 'pool' by adding fertilisers or effluent to replace the phosphorus taken up by plants. While much of the phosphorus in soil is not readily available, there are a number of reversible pathways that release small amounts of phosphorus to plants.
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