TY JOUR TI ANALYSIS OF CROP ROTATION SYSTEMS ORGANIZATION OF AGRICULTURAL COMPANIES OF TYUKALINSKY DISTRICT OF OMSK REGION ON THE LANDSCAPE AND ENVIRONMENTAL BASIS KW agricultural organizations KW suitability KW crop rotation KW landscape and environmental conditions KW humus balance KW efficiency index. JO Vestnik of Kazan State Agrarian University AU Marakaeva, T.. AU Nozhenko , T.. PY 2016 IS 11 PB Kazan state agrarian University