Аннотации:
The optimal use of vegetation factors often requires the need for intensive interventions to improve and regulate them in relation to the ecological requirements of cultivated plants. In order to increase the productivity of agricultural crops and to improve soil fertility, a series of technical procedures involving the differential application of fertilizers are applied. The decrease in the ratio between the rises in the prices of agricultural products and those of the industrial products bought by farmers deepens the scissors of prices, which leads us to the conclusion that the production increase from the application of systems of fertilizers does not cover the expenses necessary for their use.