BORON TOPDRESSING EFFECTIVENESS ON THE SUGAR BEET CULTIVATION ON THE MAIN SOIL TYPES
In this article we evaluated data of widespread short-termed field researches (about 90 experiment-years) of boron topdressing effectiveness on the sugar beet cultivated on the main types of Russian soils. Our study revealed that in cases of mobile boron forms deficit in soil the evaluated approach could secure an industrially significant additional yield up to 2.7-3.2 t/ha on grey forest soil and leached chernozem, 5.6-6.3 t/ha on typical and ordinary chernozem and 4.4-5.7 t/ha on carbonate chernozem and and chestnut soils under the irrigation. Boron microfertilizers increase the sugar content in roots on 0.3-0.9% and secure its more or less stable content between 17.2 and 19.0% for cultivation on the main soil types. As a result a sugar recovery can be raised up to 6.8 t/ha and even more (on the typical chernozem) among other reasons because of boron fertilizers application in doses 0.50-0.65 t/ha (more than 1.0 t/ha on typical chernozem). Payback of 1 kg of primary nutrient can reach tens or even hundreds of product (beet roots).