The effects of after-ripening heat and nitric acid on seed dormancy of four local cultivars of padi (Oryza sativa L.)

Hor Y. L ., . and Khuzaimah bte Haji Mohamed Nor, . The effects of after-ripening heat and nitric acid on seed dormancy of four local cultivars of padi (Oryza sativa L.). pp. 57-63. ISSN 0126-6128

Four local cultivars of padi namely MR 71 MR 73 MR 77 and IR 42 had more than 80 dormant seeds when freshly harvested. After-ripening 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 after ripening. Except for MR 71 where dormancy was less severe germination of only 78 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 degrees 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 were discussed

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Abstract

Four local cultivars of padi namely MR 71 MR 73 MR 77 and IR 42 had more than 80 dormant seeds when freshly harvested. After-ripening 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 after ripening. Except for MR 71 where dormancy was less severe germination of only 78 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 degrees 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 were discussed

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Item Type:	Article
Additional Information:	3 tables; 8 ref. Summaries (En Malay)
AGROVOC Term:	ORYZA SATIVA
AGROVOC Term:	VARIEDADES
AGROVOC Term:	LATENCIA
AGROVOC Term:	INTERRUPTORES DE LATENCIA/ CALOR
AGROVOC Term:	ACIDO NITRICO
Depositing User:	Ms. Norfaezah Khomsan
Last Modified:	24 Apr 2025 05:53
URI:	http://webagris.upm.edu.my/id/eprint/18733

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