Savchuk O. Effekt of biologikal factors on the crop rotation produktivity and soddy podzolic sandy loam fertility.

Subjekt of research - a process of the change of soddy podzolic sandy loam soil fertility indices at different methods of its use, in intensive agriculture and the increase in crop productivity in crop rotations. The aim - to devise the methods of crop rotation biologization that secure the high crop productivity and restoring soil fertility for the farms with various level of resourse provision. The methods are field, comparative and computational, mathematical and statistical. The practical results and novelty - the possibility of reccomended mineral nitrogen dose differentiation depending on the part of legume crops in crop rotations at average levels of the phosphate-potassium fertilizer application is shown. It is established that the crop rotation legumes saturation up to 28 % in main and postharvest sowings at moderate rates of the mineral fertilizer and manure application secures the crop rotation productivity about 60 hkg/ha feed units and the extended reproduction of soil fertility. The research results are introduced in 2005 at the farms of Zhitomyr region over an area 220 ha. The field of application - the agricultural production.