Поступление 137Сs в растения яровой пшеницы и многолетних трав на торфяно-глеевой почве в зависимости от уровней калийного питания

Abstract

On peaty gley soil the authors studied the effect of increasing rates of potassium fertilizers and soil provision with mobile potassium on entry of 137Cs into grain of spring wheat and hay of perennial grasses. It was established that between the content of mobile potassium in soil and the entry of 137Cs into products there was a strong inverse relationship (R2 = 0,55). The most significant decrease in the transfer factor of 137Cs into plants was observed in case of increasing soil provision with K2O in the range of 200–700 mg/kg. On condition of content of P2O5737–748 mg/kg and K2O 625–665 mg/kg in soil, the most effective under spring wheat was the use of phosphate and potash fertilizers in R60K120 rates, reducing 137Cs grain intake by an average of 24 %. During cultivation of perennial grasses the maximum reduction of 137Cs in hay (2.2–3.0 times) was provided by the use of phosphate fertilizers in rates of P60 and potash fertilizers in rates of K240. On peaty gley soil, in contrast to the peat-bog soil, the 137Cs transfer factor into grain of spring wheat was 5 times below the average one; into hay of perennial grasses it was 2 times lower. In addition, in comparison with sod-podzolic sandy loam soil, the parameters of 137Cs migration into grain of spring wheat were 2 times higher, into hay of perennial grasses the parameters showed similar values.