By Edited by M. Olofsdotter

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Allelopathic rice cultivars must release allelochemicals in bioactive concentrations. The compounds must have persistence in the soil environment or their degraded products must be allelopathically active. The mere presence of allelochemicals in plants is not enough to prove allelopathy. Studies on the release of allelopathic compounds in bioactive concentrations from rice plants are important to prove allelopathy in rice. Therefore, we need to address two questions: (I) What is the critical stage of the rice plant after which it starts releasing allelochemicals into 48 lnderjit and Olofsdotter the soil?

1988. S. rice. Oryza sativa. Weed Technol. 2:232241. Whittaker RH, Feeny PP. 1971. Allelochemicals: chemical interactions between species. Science 171:757-770. Notes Authors’ address: United States Department of Agriculture. O. O. Box 351, Stuttgart, AR 72160. Citation: Olofsdotter M, editor. 1998. Allelopathy in rice. Proceedings of the Workshop on Allelopathy in Rice, 25-27 Nov 1996. Manila (Philippines): International Rice Research Institute. M. R. O. E. ) P. Beauv. (barnyardgrass) and Cyperus difformis L.

42 Kim and Shin Notes Authors’ address: College of Agriculture, Kyungpook National University. Taegu 702-701. Republic of Korea, fax (82) 53-950-6701. Acknowledgments: This research was supported by funds administered through the R & D Promotion Center for Agriculture, Forestry and Fishery, Ministry of Agriculture and Forestry, Korea. IRRI and RDA (Korea) provided rice cultivars for testing. Citation: Olofsdotter M, editor. 1998. Allelopathy in rice. Proceedings of the Workshop on Allelopathy in Rice, 25-27 Nov 1996.

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