期刊名称：Pertanika Journal of Social Sciences & Humanities
印刷版ISSN：0128-7702
电子版ISSN：2231-8534
出版年度：1986
卷号：9
期号：1
出版社：Universiti Putra Malaysia
摘要：Four local cultivars of padi, namely MR 71, MR 73, MR 77 and IR 42, have more than 80%0 dormant seeds when freshly harvested. After-ripening, especially in the air-conditioned room was effective in overcoming their dormancy and increasing germination to more than 80%o and 90%> after eight and sixteen weeks respectively. Heat and nitric acid treatments were less effective than after ripening. Except for MR 71 where dormancy was less severe, germination of only 78%0, 72%) and 69%) was obtained for MR 77, MR 73 and IR 42 respectively with the best heat or nitric acid treatments. Exposure to 45°C for four days was best. The effect of nitric acid varies between varieties. For MR 71 and MR 73, soaking for 6-12 hours in 0.3 M nitric acid was optimal. For MR 77 and IR 42, soaking in 0.5 M nitric acid for 3-6 hours and 12 hours respectively was best. The practical implications of the study are discussed.
