This guide describes how to obtain a representative sample of stockpiled dairy manure or dairy compost, select a reliable manure or compost testing laboratory, determine which lab analyses are needed (including total nitrogen, nitrate nitrogen, ammonium nitrogen, total phosphorus, total potassium and solids), and estimate nutrient availability. It gives illustrated, step-by-step sampling instructions and equations for converting units from dry weight to as received and vice-versa.
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