In order to provide basic data for efficient control of weedy rice, we analyzed emergence rate of 100 weedy rice genetic resources collected in South Korea according to growth temperature and soil burial depth. Analyzing of emergence rate using low dormancy weedy rice genetic resources, emergence was increased at 12 and 14°C of mean temperature condition. When calculating the effective accumulated temperature above 10°C, emergence rate increased 0.6% and 0.5% in 1 cm and 3 cm of soil depth, respectively according to increase of 1°C. However it reduced as 0.28% in 5 cm of soil depth condition. Analyzing of emergence rate using high dormancy weedy rice, red rice showed 55%, 46%, 41% of emergence rate in 1 cm, 3 cm and 5 cm of soil depth condition, respectively. However those of white rice decreased as 10%, 8% and 5.7% in 1 cm, 3 cm and 5 cm of soil depth condition, respectively. Relative emergence, assuming the final emergence rate as 100%, reached 80%, 90% and 100% when effective accumulated temperature was 83-112°C, 100-123°C, 148-160°C respectively.
Figures & Tables
Cultivation of weedy rice for testing of emergence characters using (A) low dormancy and (B) high dormancy weedy rice genetic resources. Low or high dormancy weedy rice was classified according to the germination rate of 80%. Seed was sowed at different soil depth conditions with three replications. Low dormancy weedy rice was cultivated at 15/5°C, 16/6°C, 17/7°C, 18/8°C, 19/9°C with 13 hours light condition. High dormancy weedy rice was cultivated at natural condition from November in to 2015 to May in 2016.