Kirichenko A. Transformation of phosphorus compounds in the gray forest soil under different fertilization systems in field crops rotation in Right-Bank Forest-Steppe

Object - agrochemical processes in the gray forest soil large-dusty-light loamy with prolonged use of different fertilizing systems. Formation of crop productivity of field crop rotation and by direct action of fertilizers and their aftereffects. Purpose - to establish patterns of transformation of phosphorus in gray forest soils for long-term (46 years) use of organic and mineral fertilizers in the link of 10-field crop rotation and at stopping of their application for one crop rotation, and the impact on the formation of the productivity level of crop rotation. Methods - field, laboratory, calculative-comparative and mathematical statistics. Theoretical results - science-based solutions to the problem of simple and expanded reproduction of fertility gray forest large-dusty-light loamy soil and accumulation of its fund phosphate appreciable increase of available for plant forms of phosphorus for the systematic application in the crop rotation of organic and mineral fertilizers in moderate rates and established economic and energy expends of mineral system of fertilization. Practical results - developed scientifically grounded fertilization system which is based on rational combination in crop rotation of fertilizers manure and crop by-products. Recommendations for the use of fertilizers in order to obtain the highest level of productivity of crop rotation and to provide a simple or expanded reproduction of fertility of gray forest large-dusty-light loamy soil under different fertilization systems. Moderate organic-mineral fertilizer and renewable systems are recommended for implementation at farming. The possibility of organic farming in the provision of litter manure of cattle. Novelty - for the first time the theoretical substantiation of optimization of mineral nutrition of plants for a long 46-year use of organic and mineral fertilizers in the field crop rotation at traditional and alternative systems of fertilization, described their effect on phosphate regime of gray forest soil and formation of productivity level field crop rotation; the features of formation of fractional composition of soil phosphates and their distribution in the one-meter layer at defined under different fertilizing systems; set rates for fertilizer use in their long time application in field rotation as measure of soil fertility reproduction and play a positive balance of NPK provision; the further questions are developed about the impact of the aftereffect of fertilizers on agrochemical indices of gray forest large-dusty-light loamy soil. Degree of application - major research results come under production test at LLC ENAF "Mriia" Volodarsky district, Kyiv region on an area of 200 hectares and JV AIC "Nastashka" Rokitnyansky district Kyiv region on an area of 30 hectares. The field is agriculture.