V.A. Ryzhkov, T.A. Krasnoshchekova, E.V. Tuaeva, E.V. Ryzhkov, O.Yu. Ishchenko
Far East State Agrarian University
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Summary. Sapropel is a unique natural organic raw material that can be used in animal feeding. However, the chemical compound of sapropel is dependent on the biogeochemical and climatic conditions in some regions. In conditions of Priamurye knowledge of sapropel resources is insufficient. In the result of years of research defined sapropelic fund of Amur region climatic zones: Northern, Central and Southern. 81 lakes sere surveyed with a total area of 6 497 ha and sapropel deposits was defined, which amounted to 20 631 thousand t. It is found that a large area of the lakes is situated in the Central area of the region with the total capacity of the sapropel layer of 4,32 m, while in the North and South the levels are equal to 3,56 m and 3,63 m, respectively. Along with this, in the process of studying of a chemical compound of sapropel in separate zones its suitability for feeding animals was defined. Howerver, sapropel of the lakes of the Northern zone Unsuitable was sapropel unsuitable. So, it contains radionuclides Sr-90, K-40, Cs-137, Ra – 226 and toxic metals Cd, Hg and Pb above maximum allowable concentrations. As for sapropel of the lakes located in the Central and Southern zones, radionuclides are not fixed. Lake with the name Kositsina is typical one for the Southern part of the Amur region. The chemical compound of sapropel in this lake consists of protein (14,9%), almost all of the normalized mineral substances, all essential amino acids. For example, it contains of amino acids such lysine – 0,5%, valine – 0,82%, tryptophan – 0,82% which are in the demand for animals.
Keywords: sapropel, lakes, chemical composition, trace elements, organic substances, heavy metals, radionuclides.