MOBILISATION OF NITROGEN OF SOIL UNDER THE INFLUENCE OF NITRIC FERTILIZERS AND RECEIPT 137СS IN PLANTS
On sod-podsolic sandy soil influence of doses and terms of entering of nitric fertilizers on formation «added nitrogen interaction» and its interrelation with accumulation <sup>137</sup>Сs in plants is studied. It is established, that nitric fertilizers raise consumption by plants of nitrogen of soil in relation to background on 30-89% depending on their doses. At fractional entering N<sub>9</sub> in comparison with unitary, the quantity «added nitrogen interaction» in plants increases on 0,32-1,44 g/m<sup>2</sup>, and at increase in a dose of fertilizer to N<sub>12</sub> - for 0,63-1,60/m2 On unit of nitrogen of fertilizers 0,31-0,92 units of soil nitrogen will be mobilised. At fractional entering of nitric fertilizers and with increase in their doses value of the given indicator increases. Presence of close positive correlation between concentration <sup>137</sup>Сs in grain and size «added nitrogen interaction» specifies that nitric fertilizers not only directly strengthen migration <sup>137</sup>Сs in system soil-plant, but also indirectly - as a result of additional mobilisation and consumption by plants of soil nitrogen.