Turchyna K. Estimation of soil-conservative state of the drained turf-clay carbonate soils of Western Polissya in Ukraine.

The thesis is dedicated to an actual task solving - development of estimation methods for soil-conservative state of drained turf-clay carbonate soils. For the influence estimation of precipitation and active accumulated temperatures on the crop productivity it was fulfiled the regressive data analysis for the precipitation and crop productivity. Some researches on the GWL and humidity of turf-clay carbonate soils were carried out and it was determined that the humidity regime of these soils is considerably stipulated both: a ground water level and meteorological conditions. Development of estimation methods for soil-conservative state of drained turf-clay carbonate soils Western Polissya, which takes into account the meteorological and melioration terms of forming of harvest, ecological firmness, level of fertility soils but degradation processes. The crop productivity significantly depends on the factors which characterize a soil fertility. First of all it concerns humus content, granulo-metric composition, equilibrium density, macro and micro elements content. In the course of researches it was determined that an application of the single N120P60K120 and double N240P120K240 mineral fertilizer application rates does not promote an increase of turf-clay carbonate soils provision with exchangeable potassium up to the average its content and accordingly this factor is to be remained within the first minimum.