Changes in the acid-base properties of sod-podzolic light loam soil during periodic liming

In a field experiment in the link of the grain-grass crop rotation (barley with sowing of clover and phleum –perennial grasses of the 1st and 2nd year of use), changes in the acid-base properties of sod-podzolic light loamy soil during periodic liming were studied in order to establish optimal doses of lime with its long-term periodic use. A comparison of the average yields of barley grain and hay of perennial grasses over 3 years of testing in variants with single and periodic liming showed the advantage of periodic lime application in a dose of 1.0 H_a. In the variant with periodic lime application of 1.0 H_a, the acidity was significantly lower than in the control and in the variants with doses of 0.5 and 0.25 H_a, while the latter variants did not differ significantly in terms of acidity. Periodic liming led to a significant decrease in the content of Al³⁺, Fe and Mn. At the same time, there was a significant increase in S and V indicators and a decrease in H_a. No significant changes in the content of phosphorus, potassium and humus under the influence of periodic application of lime have been established. It was shown that the optimal dose of lime for its periodic use is 1.0 H_a.