Introduction. There is no ideal soil, that is, any soil will dry out over time, that is, it is natural that it will degrade. No matter how fertile the field is, if it is exploited year after year, if its productivity is not maintained, sooner or later it will stop giving a high yield. It should be remembered that restoring soil fertility is much more difficult and expensive than maintaining it. It is not a secret to all of us that it is possible to improve soil fertility, first of all, by knowing how to use fertilizers correctly. But we must not forget that in this case the principle "The more the better" is not effective.

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