e-ISSN 2231-8542
ISSN 1511-3701

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The Effects of After-ripening, Heat and Nitric Acid on Seed Dormancy of Four Local Cultivars of Padi (Oryzasativa L.)

Y.L . Hor and Khuzaimah Bte Hj. Mohamed Noor

Pertanika Journal of Tropical Agricultural Science, Volume 9, Issue 1, April 1986

Keywords: Dormancy breaking; Oryza sativa

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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.

ISSN 1511-3701

e-ISSN 2231-8542

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