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Elmore CD. 1980. Inhibition of turnip (Brassica rapa) seed germination by velvetleaf (Abutilon theophrasti) seed. Weed Sci. 28:658-660. Fay PK, Duke WB. 1977. An assessment of allelopathic potential in Avena germplasm. Weed Sci. 25:224-228. Friedman T, Horowitz M. 1971. Biologically active substances in subterranean parts of purple nutsedge. Weed Sci. 19:398-401. Gabor WE, Veatch C. 1981. Isolation of a phytotoxin from quackgrass (Agropyron repens) rhizomes. Weed Sci. 29:155-159. Gressel JB, Holm LD.

Weed Sci. 12(1):52-60. 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.

6-m plots in a randomized complete block design with three replications. Each plot was infested with the selected weed seed before seeding rice. Other weeds were controlled with herbicide 28 Hassan et al applications followed by hand weeding. Plots were drained 5 d after seeding, flooded every 3–4 d, and permanently flooded 30 d after seeding. Allelopathic activity was recorded 30–40 d after seeding based on reduction in dry weight of the weeds between rows. Evaluation of allelopathic rice varieties in broadcast-seeded rice 1995 experiment (2a).

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