Balance of nitrogen, zinc and tin in the soybean crop in the Amur region soils

The article is devoted to the cycle of nitrogen, zinc and tin in the soybean crops in the most common and fertile soils of the Amur region. At harvesting nitrogen in soybean plants is mainly accumulated in the seeds (63 %) and lowest in roots (11 %). So its removal with the harvest is 75 %. The similar regularity has been observed for zinc, the economic removal of which has been 67-69 % of the total biomass accumulated during the growing season. Both these elements have been related to the agrochemical active group. Topography of the accumulation and distribution of tin as a typical heavy metal, in the soybean plant, is very different from that of nitrogen and zinc. The main amount of tin accumulated during the growing season is deposited in the roots and leaves that remain on the field after harvesting, so the removal of this element is only 18 % and return is 82 %, so the tin should be classified as a low active agrochemical element.