Ce tracer techniques have been applied to determine the dynamic process of absorption by crop after foliar spraying of La and Ce. After 48 hours of
140
La and
141
Ce solution spraying on leaves
the absorption of
140
La and
141
Ce by spring wheat got the peak value. At the fifth day it reached dynamic equilibrium
the absorption rate reached maxium on one hour after foliar spraying. The relationship of absorption rate of La and Ce with time can be described by the formula y=ab
x
Within six days
the absorption rate of La and Ce changed in the range of 0.18-1.549% and 0.38-0.87%
respectively
but the accumulation in grain was poor. The experimental results showed that the absorption of Ce by spring wheat from soil was more difficult than from leaves.