Tymchyshyn I. Productivity of crop rotations depending on fertilizing and saturation grain crops on grey forest soil of the western Forest-Steppe

Subject of research - the process of soil fertility and agricultural crop productivity change depending on the fertilizing systems and crop rotation cereals saturation. The aim - to establish an influence of various cereal crop saturation on the short-term rotation productivity in the system of traditional and "biologized" agriculture of the western Forest-Steppe. The research methods are field, laboratory, comparatively-analytical, computational-comparative, mathematical-statistical. Maximally admissible cereal crop rotation saturation for the farms of grain direction specialization (up to 75% of sereals) is substantiated on condition of organo-mineral fertilizing system application where traditional and alternative fertilizers take as organic ones. The recommendation concerning the introduction of short-term grain-row-crop and crop rotations are worked out what will promote the increase in seedbed productivity, crop products quality improvement, soil fertility preservation. The research results are introduced at the ferms of the Shumskyi district of Ternopil region and Dubnivskyi district of the Rivne one over an area 84 ha during 2007-2009. The field of application - the agricultural production.