ECONOMIC BALANCE OF NITROGEN, PHOSPHORUS AND POTASSIUM IN THE PLANTATIONS OF WINTER WHEAT AND BARLEY IN THE CONDITIONS OF ARARAT VALLEY

An experimental research has been carried out in 2020-2022 in the plantations of winter wheat and barley, where the the economic balance of nitrogen, phosphorus and potassium on the background of productive doses of organic-mineral fertilizers are observed. It has been found out that the biological (productive) removal of nitrogen and potassium exceeds the doses of fertilizers (N120P80K90), but the dose of phosphorus is not balanced. As a result, balances of nutrient elements are definitely negative. The balance of nitrogen in the wheat is 121-180 annually, that of P2O5 it is 9-97, K2O 33-170 kg/ha, in the barley, respectively, 90-142, 6-84 and 6-139 kg/ha. As a result of the deepening deficit of macroelements in the soils of farms the dehumification of the soils and the reduction of the yield of grain crops is continued