EFFECT OF CLIMATIC AND AGROCHEMICAL FACTORS ON OATS PRODUCTIVITY UNDER CONDITIONS OF THE NORTH OF TOMSK REGION

Abstract

There were analyzed certain dependencies of oats productivity on climatic and agrochemical factors under conditions of the north of Tomsk Region. Investigations were carried out in the experimental field of the Siberian Research Institute of Agriculture and Peat, Tomsk, based on a long-term field experiment established in 1947 in time and space to study the organomineral fertilizer system and agricultural crop rotations. The experimental data for 1983-2007 were to be investigated. It has been found that oats productivity is only 38 percent determined by heat and moisture availability during the growing period. It has been revealed that the NPK-compound in a dose of 60 kg a. i. per ha against the background of 40 t/ha manure aftereffect provides the maximum increase in oat grain yield as compared with the natural background without fertilizers, that is 1.39 t/ha (89%). The high doses of mineral fertilizers of 90 and 120 kg a. i. per ha did not have an advantage in this case as compared with the dose of 60 kg a. i. per ha; the gains to the control were 1.27 (81%), 1.28 (82%), and 1.36 (87%), respectively. The availability of oats with major nutrition elements at the end of seven-course rotation cycle at the level sufficient for the plant growth and development is N-NO3-1.4-8.4 mg per 100 g of soil, K2O-5.1-7.5, P2O5-18.1-22.7 mg per 100 g of soil. It has been concluded that oats productivity is 98 percent determined by the content of labile phosphorus, potassium and nitrogen cations in soil.