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4 Giza 176 IET 1444 IET 11754 Balal Zarrak LD 183-7 RP 2269-424-298 AC 1225 Dular GZ 1368-5-8 OR 131-5-8 UPR 82-1-7. RP 2271-433-281 GZ 4255-9-1 Table 5. Allelopathic activity of rice varieties around Echinochloa crus-galli under natural or overseeded plots (1996). Rice variety E. crus-galli (control) Giza 176 IET 1444 IET 11754 Bala Zarrak LD 183-7 RP 2269-424-298 AC 1225 Dular GZ 1368-5-8 OR 131-5-8 UPR 82-1-7 RP 2271-433-281 GZ 4255-9-1 Natural Dry weight (g m-2 ) 458 440 23 46 98 38 33 21 68 53 33 31 18 22 100 a b g ef c fg fg h d de fg fg h gh c infestation a Hand-weeding time (h ha -1) 88 84 6 8 23 7 7 8 13 12 9 6 5 6 25 a a ef de b def def de c c d e f ef a Overseeded Dry weight (g m -2) 1940 1860 485 520 840 505 490 465 630 680 730 495 390 410 866 a a efg e b e e g d d c ef l h b Hand-weeding time (g m-2) 633 614 161 183 293 195 166 154 180 210 269 165 132 139 287 a a de cd b c d e cd c b d e e b aMeans followed by the same letter within a column are not significantly different at the 5% level by Duncan's multiple range test.

Results were confirmed in laboratory and greenhouse studies (data not presented). Evaluation of selected allelopathic rice varieties in broadcast-seeded rice 1995 experiment (2a). The greatest suppression of E. crus-galli (81-85%) was obtained from IET 1444, IET 11754, and CI-Selection 63 (Table 3). Fair suppression was observed with Ratna (62%), IR1108 (62%). Dular (66%), GZ 4255-9-1 (6l%), and RP 2269-424-298 (63%). Rice varieties IR2006-B3-33-2 and LD 183-7 suppressed E. crus-galli 71% and 75%, respectively.

Breeding and enhancement Individual F2 populations from hybrids involving PI 338046 with Adair, Alan, Katy, Lemont/RA 73, M-201/Katy, and Newbonnet were evaluated in 1992 in Stuttgart fields. IR8 and TN-1 are two parents in the pedigree of PI 338046. Therefore, PI 338046 or lR8*'2//85894 A4-18-1*2/TN-1 has two (IR8 and TN-1 ) of the four common parents previously identified from the IRRI material, which possess allelopathic potential for both ducksalad and redstem. Seven F6 lines from the crosses PI 338046/ /Lemont/RA 73, PI 338046/Alan, PI 338046//M-201/Katy, and PI 338046/Katy were field-evaluated in replicated tests in 1996.

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