The influence of mineral fertilizers after liming on the productivity and properties of sod-podzolic soil of the European north of Russia

The studies on the efficiency of mineral fertilizers (N60P75K75) after introduction of two lime doses (1.0 and 2.0 of hydrolytic acidity value (h.a.)) were carried out during the stationary field experiment on sod-podzolic medium-loamy soil started in 1983. The authors surveyed the aftereffect of two lime doses in pure form and with annual application of mineral fertilizers. The highest yield of legume-cereal grass mixtures was obtained in the case of lime 2.0 h.a. + NPK application and amounted to 6.9 t/ha dry matter (d.m.) in 2011, 6.4 t/ha d.m. in 2021 against the control values of 3.0 and 2.4 t/ha d.m., respectively. The content of dry matter was 21.4 %, crude protein - 12.7%. The nitrate content did not exceed the maximum allowable concentration. Lime and NPK positively affecedt the agrochemical soil properties. The humus content was 2.0 %, pHKCl - 4.8 pH units, P2O5 - 208 and K2O - 140 mg/kg soil in 2021.