INFLUENCE OF CLIMATE FACTORS ON LIMING EFFICIENCY OF SANDY SOD-PODZOLIC SOIL IN THE CONDITIONS OF WESTERN POLISSIA

Abstract

The article is devoted to the study of climatic factors’ influence on the acidity dynamics of sod-podzolic soil and crop rotation productivity at different rates of dolomite flour CaMg(CO3)2 and lime (CaCO3) application in connection with climate change in Western Polissia. The results of the study presented in this article showed that introduction of 1.5 norm by hydrolytic acidity of dolomite flour on the background of mineral fertilizers N112P82K105 reduces the acidity after the second year of application. It decreased to 6.03 рНKCl units and remained in the same range during two crop rotations. With the introduction of 1.0 norm by hydrolytic acidity of dolomite flour, such effects were observed only in the fifth year after application and the duration of the aftereffect was shorter. The use of 1.0 norm by hydrolytic acidity of lime flour was less effective compared to the identical rate of dolomite. The efficiency of limestone reclamation means directly depended on the amount of precipitation in the Western Polissia of Ukraine. 3D-modeling of the interdependent dynamics of soil acidity and two climatic indicators showed that the simultaneous increase of annual heat and moisture resources to the average for the period of crop rotation increased the рНKCl to the maximum. 3D-models of the dependences of soil рНKCl dynamics and two climatic indicators visualized the regularity of less acidification of the soil with mineral fertilizers in dry years and at elevated average annual temperatures. Increased rates of annual precipitation, especially with increasing temperature, increases the acidification of non-meliorated soil. The highest productivity on average in two crop rotations is provided by the application of 1.5 norm by hydrolytic acidity of dolomite flour on the background of complete mineral fertilizers N112P82K105 – 5.33 t/ha of grain units, which is higher than the corresponding background options by 2.27 t/ha or 74.2%. The average productivity for two crop rotations (2011-2019) was very closely dependent (r = 0.97) from the average for these years рНKCl indicator. The use of limestone flour as an ameliorant had a weaker effect on crop rotation productivity compared to lime flour due to the deterioration of magnesium nutrition of plants. The established scientific results are new for the conditions of Ukrainian Northwestern Polissia and indicate the need to correct the practice of liming acid soils to achieve optimal рНKCl. These results are also useful for restoration of sandy sod-podzolic soils’ fertility and productivity of arable Ukrainian Northwestern Polissia lands in conditions of further climate transformation to warming and humidification