Accelerated Ageing as A Vigour Test for Sorghum Seed

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Ibrahim, A. E.
Tekrony, D. M.
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Faculty of Agriculture, University of Khartoum, Shambat, Sudan
A study was undertaken to standardize the conditions for the accelerated ageing (AA) test as a vigour test for sorghum {Sorghum bicolor (L.) Moench} seed. Three ageing temperatures (41°, 43° and 45°C) and three durations (24, 48 and 72 hours) at 100% RH were employed using 12 sorghum seed lots of different ages and treated with different chemicals. Seed moisture content increased with higher temperatures and longer durations of ageing with little variation between seed lots. Equilibrium moisture contents of 29-30% were reached after 72 hours at 43° and 45°C. Seed germination was almost unaffected by ageing at 41°C, but declined with increasing test duration at higher temperatures. Newer seed consistently had higher germination, but the chemical treatments were variable. Seeds treated with Captan fungicide showed better germination than the untreated seeds and those treated with a 'herbicide antidote or "safener" were more sensitive to ageing stress especially in older lots. Seed lots were effectively separated by ageing for 72 hours at 43°C or for 48 hours at 45°C.
Page(s): 2 (1), 59- 72, 8 Ref.
Seed moisture, higher germination, fungicide, chemical treatments