Kondratiuk I. Parameters of physical and chemical property changes of grey forest soil under the influence of crop fertilization and liming aftereffect

The dissertation states the research results of the investigation of an influence of liming aftereffect with the use of different fertilizer systems on the fertility of grey forest soil: physical and chemical properties, the processes of calcium transformation, humus content, agrochemical properties, the crop yield in the right-bank Forest-Steppe zone of Ukraine. On the basis of obtained results it was established that the basal lime application technology on grey forest soils which is based on full rate application (5,5-6,0 t/ha, calculated using hydrolythic acidity) in the combination with organic and mineral fertilizers (10 t/ha manure and 164 kg/ha NPK) provided during 10 years close to optimum indices of soil solution reaction (pHKCl 5,8-6,4, Hr - 1,1-2,0 meq/100 g soil, the degree of exchange base saturation of soil absorbing complex 75-80 %). The optimal parameters of the grey forest soil fertility are achieved faster and maintained for a longer period if the dolomitic meal was applied (5,5-6,0 t/ha calculated using Hh value along with organic and mineral fertilizers). On the twelfth year of the lime activity the pHKCl index reached 5,9 and Hh - 2,6 meq/100 g soil. The crop rotation productivity increased by 10-23 hkg/ha of grain units.Application of the lime in the rate of 1,5 Hh in the combination with 1,5 mineral fertilizer rate (N80P80K85) and manure (10 t/ha) in crop rotation appeared to be the most effective. It ensures the stopping of acidification processes; the soil absorbing complex became saturated with exchangeable bases. The action of such rates lasts more than ten years, during all the period the optimum reaction of soil solution is maintained.