Litvinov D. Agrobiological bases on the increasing of efficiency of short-term crop rotations Left-bank Forest-Steppe zone of Ukraine

Object of research -rchanges in regularity of agrochemical and biological properties of easy loam and coarse-dusty typical chernozem with light humus content, yield and quality formation of crop production and productivity of short cycle rotation under the influence of different saturation by grains, cereals and industrial crops and their intensification level. The purpose - theoretical foundation and development of agrobiological efficiency of short cycle rotation with different saturation and ratio of grain (including single-species), cereals and industrial crops and using intensification tools (mineral and organic fertilizers) for the Left Bank Forest-Steppes zone of Ukraine. Methods - field, laboratory, comparative calculated, mathematical-statistical, comparative and analytical, physical, regression, information and logical analysis and mathematical modeling. Theoretically substantiated model for agrobiological efficiency of short cycle crop rotation with varying saturation of grains, cereals and industrial crops and their intensity in subzone of non stable humidity of Left Bank Forest-Steppes zone of Ukraine on easy loam and coarse-dusty typical chernozem with light humus content. Develop and recommend models of short cycle rotation, with scientific justification of saturation and alternation of grains, cereals and industrial crops, mineral and organic fertilizing in condition to increase and stabilize soil fertility provide crop yield at 4,90-5,30 t/ha, grains - 4,00-5,30 tons per hectare, feed units - 7,80-8,90, grain units - 5,0-6,0, digestible protein - 0,55-0,65 tons. Scientific developments made between 2004-2013 and were implemented at collective farms and private property in Poltava and Kiev regions, covering a total area 11,820 hectares. The field of use is agricultural production.