The Effects of After-ripening, Heat and Nitric Acid on Seed Dormancy of Four Local Cultivars of Padi (Oryza sativa L.)
Hor, Yue Luan and Mohamed Noor, Khuzaimah (1986) The Effects of After-ripening, Heat and Nitric Acid on Seed Dormancy of Four Local Cultivars of Padi (Oryza sativa L.). Pertanika, 9 (1). pp. 57-63.
Four local cultivars of padi, namely MR 71, MR 73, MR 77 and IR 42, have more than 80% dormant seeds when freshly harvested. After-npening, especially in the air-conditioned room was effective in overcoming their dormancy and increasing germination to more than 80% and 90% after eight and sixteen weeks respectively. Heat and nitric acid treatments were less effective than afternpening. Except for MR 71 where dormancy was less severe, germination of only 78%, 72% and 69% was 0 btained 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 van'es between van'eties. 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, soak"" in 0.5 M nitric acid for 3 - 6 hours and 12 hours respectively was best. The practical implications of \ the study are discussed
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