เทคนิคการผลิตเมล็ดพันธุ์ข้าวลูกผสม PTT06001H

Abstract

The experiments of techniques for hybrid rice PTT06001H seed production was conducted at Pathum Thani Rice Research Center in wet season 2009 and dry season 2010 . The objectives of those experiments are to increase the percentage of seed sets (filled grain/panicle) in F1 seed yield (g/hill) and other traits: plant height, panicle length and exsertion. There were 2 experiments consisted : 1) Study on foliar applications of giberellic acid (GA3) in promoting panicle exsertions including cutting off flag leaves 2) Study on the ratio in rows of A and R line combined with the foliar application of GA3 and cutting off flag leaves. The results of the first experiment revealed that the treatments of no cutting flag leaves with GA3 application at 10 30 50 percentages flowering were no significantly different in seed yield, filled grain/panicle and % seed set as compared with the treatments of cutting off flag leaves and without GA3 application. The best panicle exsertion and length were showed in the treatments of no cutting off flag leaves with GA3 application at 10 % and 50 % and 30 % of flowering stage respectively. The A lines plants of no cutting flag leaves both none or GA3 application at every heading stages expressed higher than the other plants. For the second experiment, the results showed that there were no significant on seed yield of 6:2 8:2 and 10:2 but the yield was decreased to lowest at 12: 2 in the treatment of no cutting flag leaves both with or without GA3 application. At 8:2 gave higher yield than 10:2 when cutting off flag leaves both with or without GA3 application. Both 8:2 and 10:2 with no cutting off flag leaf and GA3 application could get more yield at 15 and 7% respectively. The foliar application with or without cutting off flag leaves showed increasing of plant height, panicle length and exsertion.