ความงอกและระยะพักตัวของข้าวแดง

Abstract

Red weedy rice becomes a serious problem in rice cultivation, particularly in irrigated area. To find an efficient elimination approach for red weedy rice, the study on germination and dormancy period of red weedy rice was conducted at Pathumthani Rice Research Center in from April 2004 to May 2005. Four hundred and nine samples of red rice seeds from different location (Pathum Thani, Saraburi, Angthong, Chainat, Suphanburi and Nakorn Nayok) were used in the experiment. Red rice seed samples were planted and the seed harvesting was done before shattering. After that the seed germination was tested every 1-2 week until it was more than 80%. It was found that there was a diversity of hull color characteristic i.e. straw, straw/tip, straw/awn, brown, brown/tip, brown/awn, dark brown and black. Flowering date of red rice was 61-96 days after planting. Harvesting date was 84-129 days after planting. Dormancy period was 3-10 weeks. Dormancy period of 3, 4, 5, 6, 7, 8, 9 and 10 days were found in the number of red rice population of 15, 41, 25, 91, 102, 75, 38 and 22 samples respectively. Germination after dormancy period was found in the range of 82-96%. Moreover it was found that the red rice seed exposed to the outdoor condition after harvest showed less dormancy than that exposed to the shade.