OPTIMUM Row RATIO FOR AxR SEED PRODUCTION OFPSB RC72H (MESTIZO) AT PHILRlCE ISABELA

摘要

The study was conducted at PhilRice San Mateo in Isabela Province during the 1999 dry ; wet season and 2000 diy season to determine the optimum row ratio between the male (IR34686R) and female (IR580'>5-) parents for maximum pollination for maximum seed yield; Seven treatments; ie; male-female row ratios 77 (2:6); T2 (2:8); T3 (2:10); T4 (2:12); T5 (2:14); T6 (2:16) and T7 (3:10); were used. Results for all 3 seasons slwwed that 2 row ratios were the best performers: Tl and T2; giving the highest seed yields of more than 1 3 tons/ha in the wet season of 1999 and the dry season of 2000; the differences between the vields of the two treatments not statistically significant; In the other row ratios with 2 males; a gradual decrease in seer/ se/ and yield was observed; T7 also showed promise; with an increase in the number of male rows to 3 and female rows to 10; but the difficulties in transplanting the R line and in supplementary pollination might reduce its practicability and acceptability to hybridrice seed growers.