Influence of heavy metals and oil treating agent on rice rootsystem

The influences of Ni,Zn Mn sn,Cr and Cuand the oil treating agent on rice root systen were tested Itwas found that the growth of rice root system was inhibited at 0.007mg/1 of Ni and 0.005mg/1 of Cu in the water; retardedwith more than 0.5mg/of Zn;and significantIy injuried with 20mg/1 Mn, 5mg/1 Sn and 5mg/1 Cr⁶⁺in the water.WhenCu²⁺coexisted with Cr⁶⁺in the water,and the concentrationof one metal remains stable,the inhibition of rice root systemwas enhanced as the concentration of another metal ion in-creased .The development of the rice was suppressed by 1000mg/1 oil treating agent in the water.