CHANGE OF PHYSICAL AND CHEMICAL PROPERTIES OF PEAT SOILS OF NORTHERN ZAURALYE AT AGRICULTURAL USE
It is established that in 35 years of use of peat soil on average peat under forage crops exchange acidity in корнеобитаемом (0,4) layer increases on 0,4-0,6 units рН, hydrolytic acidity in 1,6 times, the sum of the exchange bases decreases in 1,3 times. Principal causes of changes of physical and chemical properties are: carrying out of the exchange bases (the maintenance Sa <sup>2</sup> + decreases in 1,5 times, Mg <sup>2</sup> + - in 1,4 times), entering of physiologically sour mineral fertilizers (N <sub>60-90</sub>P <sub>60-120</sub>K <sub>60-90</sub>) and creation of washing type of a water mode as a result of drainage of a peat deposit (level залегания ground waters during the; vegetative period of 90-140 sm). In torfjanisto-gley soil there are similar changes.