Soil Testing - Penn State Extension
https://extension.psu.edu/soil-testing
WEBJul 5, 2023 · A soil test is a process by which elements (phosphorus, potassium, calcium, magnesium, sodium, sulfur, manganese, copper and zinc) are chemically removed from the soil and measured for their "plant available" content within the sample. The quantity of available nutrients in the sample determines the amount of fertilizer that is recommended.
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