Author： Tekrony D.M. Shande T. Rucker M. Egli D.B.
Publisher： International Seed Testing Association
ISSN： 1819-5717
Source： Seed Science and Technology, Vol.33, Iss.1, 2005-04, pp. : 185-197
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Abstract
The effect of flat and round corn seed deterioration was evaluated in warehouse and controlled storage environments. Fourteen seed lots (seven pairs; round, flat) from the same seed source of five hybrids with low levels of mechanical injury, high seed germination and a range in seed vigour were stored in multi-wall bags in an insulated warehouse and at 10°C, 50% RH for four and eight years, respectively. Four additional seed lots (two pairs, round, flat) from two hybrids were conditioned to three moisture levels (120, 140, 160 g kg−1) and stored in sealed aluminum foil packets at three constant temperatures (30, 40, 50°C). Seed was sampled at frequent intervals and tested for standard and cold test germination. There was a significant (P = 0.05) linear relationship between the time to 50% germination (P50) for round and flat seed in the two experiments. The P50 of round seed was consistently smaller than the P50 of flat seed in warehouse and controlled storage. The earlier reductions in quality of the round seed were primarily related to lower initial seed vigour and were not due to differences in initial seed size, mechanical injury or a faster rate of deterioration for round seed during storage. The accelerated aging test prior to storage was closely correlated to the time of 50% standard germination, but not the cold test germination. However, the initial cold test germination provided the highest correlation with cold test seed vigour after storage in the warehouse (10 mo) or at 10°C, 50% RH (8 yr).
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