Assessing sapropel raw materials from lake deposits of the Sakha Republic Kobyai ulus (Yakutia) and its prospects use in agricultural production

The purpose of research is to study the composition of the sapropel raw materials of lake deposits of the Kobyai ulus of Yakutia for use in agricultural production. Eight lakes were surveyed. Bottom sediments in each water body were taken from a boat in several points using a special sapropel drill. Selected general sample was separated according to recommendations according to methodology of A.F. Abramov (2007). The content of chemical composition, micro- and macroelements was determined in the laboratory of processing of agricultural products and biochemical analyses of the Yakut Research Institute of Agriculture by infrared spectroscopy on a SpectraStar 2200 infrared analyzer. The results of the study were processed by the method of variation statistics, taking into account the Student's control at p ≤ 0.05. It was noted that the biogenic layers of the lakes were rich in organic matter, the protein content varied from 6.91±0.04 % (Kokuy site of Khaltan Lake) to 20.47±0.09 % (Chagda site of Ichchileh Lake). The content of phosphorus varies in the range of 0.76-1.07 g/kg, calcium - 6.50-28.53 g/kg, cobalt - 5.44-19.58 mg/kg, iodine - 0.32-1.22 mg/kg. It has been established that the sapropel from the lakes of Kobyai ulus meet the requirements of GOST 54000-2010 "Organic fertilizers. Sapropel". The sapropel from the areas of Sangar, Abychcha lake, Sitte, Toiyon Kuol lake, Turbaakhy, Kysyl Kebeyyy lake, Kobyai, Khodusalaah lake, Kokuy, Khaltan lake, Chagda, Ichchil-kh are of the 1st class of fitness (not more than 100 mg/kg) and the areas Teya, Odulda lake, Algyma lake - of the 2nd class of fitness (100-300 mg/kg). The high content of sapropel in the biological layer of protein, other organic substances and macro- and microelements will allow using them for the production of organic fertilizers.