Bobrus S. The agroecological conditions of Polissya half-hydromorphic soils, the improvement of their fertility control and agrocenosis productivity

The studies of agroecological conditions of half-hydromorphic soils of the Zhytomyr region Polissya showed that their long-term usage in аgricultural production resulted in developing vаrious types of degradation processes which are manifested in raising acidity, decreasing humus content and its supply as well as elements of plant nutrition, etc. The paper investigates the indicators of acid and base buffering of individual fractions of granulometric composition of half-hydromorphic soils which differ by their genesis. It also establishes the interdependence between the indicators of acid and base buffering and some other indicators of agroecological soils conditions (the content of humus, alkaline hydrolized nitrogen, exchangeable calcium and magnesium, PH(Н2О), РН(KCl) and hydrolytic acidity. The thesis proves the expediency of carrying out the liming of half-hydromorphic soils based on the values of acid and base buffering indicators. The author recommends the usage of multipurpose application compost and alunite meal as organic and mineral fertilizer which also contributes to the reduction of soil acidity. The paper suggests leaching non-productive farmlands as one of the most efficient and energetically and economically sound measures for the increase and renewal of half-hydromorphic soil fertility. The possibility of introducing the fodder nine-course rotation impregnated with 4 alfalfa fields and with ecologically based fertilizer application system. To raise the productivity of farm crops the author recommends a number of variants of fertilizer application systems with the following impregnation of crop rotation: N32 P32 K36 + straw (1.2 t/ha) + green manure crops (8 t/ha); N34 P45 K45 + СаСО3 (3.0t/ha); compost of multipurpose application and alunite meal of 1.5 t/ha + СаСО3 (3.0 t/ha).