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© 1974 Oxford University Press

RESEARCH-ARTICLE

Dormancy of Paddy Seeds of a ‘Non-dormant’ Variety

H. P. SIKDER 1

Rice Research Station, Govt. of West Bengal Chinsurah, Hooghly, West Bengal, India

Seeds of a non-dormant rice variety, Satika, were studied under different natural and controlled humid conditions of storage at room temperature. Just after harvest the germination and percentages of grain moisture were 9.2 and 30.0 respectively. Under humid conditions of storage (94 per cent) there was only partial break of dormancy after 42 d (32.8 per cent ger mination) with high grain moisture (23.8 per cent); in all other treatments where the grain moisture varied from 4.4 to 16.4 per cent the germination percentages were over 96 per cent after 42 d.

This delaying effect of high moisture contents on the breaking of dormancy became very pronounced at about 26 per cent. It is suggested that high moisture content may inhibit dormancy-breaking reactions possibly by interrupting air-diffusion inside the seeds.


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