INFLUENCE OF TERMS AND DOZES OF SELENIUM OUTSIDE ROOT TOP-DRESSING CLOVER MEADOW ON PRODUCTIVITY AND CONTENTS OF THIS ELEMENT IN PLANTS
In field experience with clover meadow cultivated on podzoluvisol loamy sand soil with low selenium supplying terms and dozes outside root top-dressing of crops by sodium selenite are studied. It is established that at clover meadow cultivation on podzoluvisol loamy sand soil with low supplying of general selenium, with planned productivity of dry weight in the sum of two hay harvest more than 75 c/ha, root top-dressing by sodium selenite in the beginning of stem formation in a doze 20-25 g/ha, or in bud-formation in a doze no more than 20 g/ha under hay harvest are provided the increasing of the selenium contents in dry weight up to optimum meanings. This technique contributes to net income obtaining on 1 rubles expenses 0,37 rubles without the account of zootechnical value of enriched by selenium forage.