PJB-2012-287
IMPACTS OF RICE PLANT ROOTS ON THE VARIATION IN ELECTRO-PHYSICO-CHEMICAL PROPERTIES OF SOIL WATERS
MUHAMMAD FARRAKH NAWAZ1,2*, GUILHEM BOURRIÉ3, SADAF GUL4, FABIENNE TROLARD3, IRFAN AHMAD1, M. AYYOUB TANVIR1 AND JEAN-CLAUDE MOURET5
Abstract
Lowland rice crop is cultivated under continuous flooding and anaerobic conditions but rhizospheric region of the rice plants can have different physico-chemical conditions than in the absence of roots. However, it is very difficult to measure all physico-chemical parameters instantaneously in the rhizosphere because this region, being highly dynamic, altering rapidly those parameters of surrounding soil waters. Present study has compared the evolution of electro-physico-chemical properties (pH, redox potentials (pe), Electrical Conductivity (EC) and temperature) of soil waters during a complete day at two different phenological stages in the presence of rice roots (rhizosphere) and in the absence of roots to analyse the effect of rhizosphere on soil waters. In the rhizosphere, pH of soil waters was found comparatively low (7). Similarly, small EC values were observed in the rhizosphere. Great fluctuations (diurnal patterns) were observed during the complete days which were directly associated to atmospheric conditions (temperature and light) and rhizospheric activity, and these fluctuations were more during vegetative phase as compared to maturation stage of rice. It was also observed that incorporation of crop residues resulted in the more reductive conditions in the rice culture.
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