50SORGHUM VARIETY IMPACT ON TO BIODEGRADATION OF DIESEL FUEL CONTAMINATED SOIL |
K. Rathbone, M.K. Banks, P. Kulakow, and A.P. Schwab, Kansas State University, Manhattan, KS 66506 |
Increased root surface area and plant exudates are suggested to promote microbial activity in the rhizosphere. By using the rhizosphere of the plant to enhance the microbial activity, bioremediation should also be increased.
Different species of Sorghum bicolor were studied based on their exudate production to increase bioremediation of synthetic diesel fuel. Four varieties of Sorghum bicolor were chosen based on striga resistance (a destructive root parasite) and nitrogen efficiency, so differences in rooting characteristics could be observed. These varieties were planted in a sandy loam soil contaminated with 0.25% synthetic diesel fuel. Three time periods were used for harvesting samples: 5-leaf stage, flowering, and maturation. Plant uptake and the soil degradation of diesel fuel will be presented and discussed. Results from this study will help assess important root characteristics for plants during phytoremediation. Key words: bioremediation, exudates, rhizosphere, diesel fuel, plants.
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