Study On The Law Of Translocation And Accumulation Of Germanium In Rice Plant-Soil System

In this paper, the effect of germanium on rice plant growth under solution and soil culture in constant temperature at 25C cabinet and pot culture system in net room were studied. The law of germanium translocation and accumulation hi rice plant and soil added germanium system was also studied .On the basis of former's study, by changing some conditions of the catalytic polar graphic determination of germanium by use of the Hematoxylin (C16H14O6 '3H2O)-Ammonium Meta Vanadate (NH4VO3) system, the precision and accuracy of the method were very good in the instrument and testing conditions. The peak potential was -0.68V. The detection limit of germanium was 8.63 X 10 -4 g/g in the final solution. The working range of the calibration was 1.00 X 10 -3 - 1.60X 10-2 g/ml. The results showed this method for determination of trace germanium in the tested samples was rather sensitive, accurate and rapid method with easy operation and good selectivity. This system would be used by accurate quantitative determination of samples of the experiment.The experimental data showed that low concentration of germanium in culture solution and soil could increase the rice plant growth but high concentration of germanium could inhibit the growth or have the phytotoxicity. The degree of influence of germanium on different rice plant seedlings was different. Roots could absorb the germanium in culture solution and soil quickly and vastly. The influence of germanium on rice plant growth would be different when the adding method or the added germanium quantity was different. The law of germanium accumulation in rice plant body was stalk-leave > root > unpolished rice by terms of germanium content. In the period of growth of rice plant the ability of root to absorb germanium was different. In the plasma stage the ability of rice plant to absorb germanium is the greatest and the accumulation quantity of germanium hi the stalk-leaf was greatest in different organs. The necrotic spots appeared on the leaf blades when the germanium content was 20.0 ug/g in soil. When the germanium content was above 28.7 g/g the soil would be polluted and the total grain weight of each pot would be decreased by 10%. The germanium in soil also influenced the absorption of potassium. The ability of the rice plant to absorb potassium could be decreased with the higher concentration ofgermanium.The study can offer theory basis for the resolving of pollution problem by irrigation with industrial waster water contained germanium, and also can help the work of plant restoration and resumption of abandoned germanium mine lands. This paper can support the study of environmental and ecologic effect of germanium and the study of whether germanium is the necessary element in the growth of plant.