ANALYSIS OF THE STABILITY OF BELARUS AGRICULTURAL CROPS PRODUCTIVITY (WINTER WHEAT AND POTATO AS EXAMPLE)
Research results of the productivity stability of winter wheat and potato on statistical data for 1960--2009 at district and regional levels are presented. Calculations were done by sliding 5-year periods that has allowed to present on the obtained time numbers a dynamics of values of stability coefficients of productivity of cultures with account of trend components defining the tendencies of development of process. High stability of productivity of investigated cultures has been found, the maximum values have been registered in the Grodno district: 88,3 % for winter wheat, 84,3 % for potato. The stability minimum level characterizes winter wheat crops in the Mogilyov district (82,3 %), potato - in the Gomel one (79,3 %). Stability of the efficiency of cultures decreases from West to East. Average values of stability factor at regional level make up: 86,3 % for winter wheat, 83,8 % -for potato. Growth of heat supply of the territories has positively affected productivity of winter wheat and negatively potato growing development. In all administrative areas, except Minsk, a positive tendency of the stability of productivity of winter wheat is traced, for productivity of potato for all areas a negative tendency of the process development is observed.