Abstract
In order to determine the relationship between allelopathic potential of rice and soil enzyme activity in rhizospheric soils, a dry cultivation experiment was conducted on enzyme activity in rhizospheric soil of allelopathic rice "PI312777", "IAC47" and "Iguape", and non-allelopathic rice "Lemont" at seedling stage. The results show that allelopathic rice inhibits dehydrogenase, peroxide, polyphenol oxidase, urease, and cellulose activity and enhances acid phosphatase, alkaline-phosphatase, invertase and catalase activity in rhizospheric soils. Correlation analyses show that urease and polyphenol oxidase activity is significantly negatively correlated with rice allelopathic potential, while acid phosphatase and alkaline-phosphatase activity is significantly positively correlated with rice allelopathic potential. No significant relationship exists between protease and dehydrogenase activity with other enzymes or microbial amount and rice allelopathic potiential. Allelopathic rice decreases polyphenol oxidase activity, increases acid-phosphatase, alkaline-phosphatase and invertase activity, which is beneficial for allelopathic substance accumulation, soil carbon and phosphorus cycle enhancement.
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