1/3 * x ^ 3 * y ^ 2 + 5xy, 3/7 * x ^ 3 * y ^ 2 - 2xy and 2/3 * x ^ 3 * y ^ 2 + 7xy
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Fertilizers play an important role for soil health: they supplement the natural supply of soil nutrients, build up soil fertility in order to satisfy the demand of crops with a high yield potential and compensate for the nutrients taken by harvested products or lost by unavoidable leakages to the environment, in order ...
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