ZONE FEATURES OF MICROFERTILIZERS USE UNDER SUGAR BEET (<i><i>BETA VULGARIS</i> </i> L. SACCHARIFERA) ON THE MAIN TYPES OF SOILS IN THE AREAS OF ITS CULTIVATION
From the data of ~400 field network experiments on the study of the efficiency of microfertilizers for sugar beet (Beta vulgaris L. ssp. vulgaris convar. saccharifera Alef.), a level of root yield gain of practical significance (30-60 dt/ha) and some zonal features of their application were revealed. It is found that boron, molybdenum, zinc and copper fertilizers are most efficient under soil-climatic conditions of southern-taiga-forest, forest-steppe, and steppe zones when applied to the soil by the main method, while the most economic methods of their application (treatment of the seeds and foliar dressing) are preferred in the dry-steppe and semidesert (under irrigation) zones. Manganese and cobalt fertilizers are characterized by practically similar efficiency for all application methods. Microfertilizers increase the sugar content in roots: boron by 0.6-1.3%, molybdenum by 0.5-0.7%, manganese by 0.4-0.8%, and cobalt by 0.4-0.9. The calculations show that scientifically based application of microfertilizers for sugar beet can additionally provide for at least one million tons of sugar in the existing cultivation areas and even significantly more at their expansion.