Uptake rate of trace elements by soybean plants

Abstract

The uptake rate of^95mTc,⁸³Rb, and⁶⁵Zn by soybean plants cultivated in soil was measured during 2≈247 hrs by a multitracer technique. The uptake amount in most of the leaves and stems increased up to 150≈200 hrs after the administration of the multitracer and then decreased with time. The uptake amount of⁶⁵Zn in the youngest fruit increased until 120 hrs and then decreased with time, and⁸³Rb uptake reached almost a constant amount after 120 hrs. On the other hand, the uptake amount of^95mTc in the youngest fruit increased continuously up to 247 hrs. The behavior of elements in the leaves and stems was analyzed mathematically with the second order function,A _r=c+k₁t+k₂t², 0<t=247, whereA is the amount of uptake or translocation of elementr in each part of plants,c is a constant,t is cultivating time after the multitracer has been added,k ₁ andk ₂ are coefficient oft andt ², respectively.