Balance of organic substance and chemical elements in pasturic phytocenoses of Tersko-Kumskaya plain

It is established that accumulation of organic substance, concentration and formation the reserves of potassium in the phytocenoses depends on type of the soil and hydrothermal conditions of the area. Its concentration in green phytomass on seasons of year on the light chestnut soil makes 2,02-3,00%, in rags - 0,30-0,38, in felt of 0,34- 0,50%, in underground bodies - 0,50-0,65%. On the meadow-chestnut soil and the saline soil typical insignificant decrease in potassium concentration is noted, but its stocks in elevated weight decrease significantly: in 2,7 and 3,0 times, underground - in 2,4 and 2,8 times respectively.