Determination of Oxydation Activity of Rice Root to Ferrous Solution

Abstract

It is the purpose of this paper to establish a new method for the measurement of oxydation activity of rice root. After rice root was soaked in ferrous sulfate solution, the oxydation-reduction potential changed quickly. This change may be related to the increases of ferric ion in solution caused by oxydation activity of rice root. Eh-raising process was recorded continuously as shown in Fig. 1. Ageing process of rice root was expressed by the decreases of Eh-raising activity of rice root. Eh-raising activity of rice root of heavy nitrogen application plot decreased as shown in Fig. 4 in this studies. The drainage effect was shown in Fig. 5. Eh-raising activity of continuous paddy plot decreased remarkably at late maturing stage. The effect of pH control of ferrous solution on Eh-raising activity of rice root was shown in Fig. 3. At the unfavourable condition for rice growth as pH 4.4, Eh-raising activity of rice root decreased. From these results, the features of this method were in quick response and continuous recording of oxydation process by root. And the problems on the measuring were errors caused by the contamination of platinum electrode and reference electrode.