Question

we mix this in the soil to increase its productivity​

Answer 1

Answer:

Fertilizer .

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Answer 2

Answer:

For others, manure or compost is the answer to increasing soil productivity and plant health. And then there are bagged minerals, organic bagged fertilizers, rock powders and more.Chemical fertilizers have just those three elements, plus inert fillers (which would be 80% in the example cited).