Influence of seed priming techniques on germination and emergence of rapeseed (Brassica napus L.)

Seed priming is a physiological technique that improves seed performance including faster and more synchronized germination times. This study examined how to enhance the germination and emergence of rapeseed (Brassico napus L.) CV. Hyola 401 seeds using different priming treatments. Priming treatments examined were hydropriming, osmopriming with polyethylene glycol (PEG 6000), and solid matrix priming with animal compost (SMP). Seeds from each of these 3 techniques were primed for 12 and 24 hours. Germination times and percentages, seedling growth. and electrical conductivity of seed leachates were measured. Solid matrix priming with compost was effective in improving germination percentage as compared to the non-primed control. Solid matrix priming with compost for 12 and 24 hours. and hydropriming or 24 hours were the most efficient techniques for reducing the mean germination time. Highest electrical conductivity was recorded for the control group and seeds osmoprimed with PEG 6000 and the lowest electrical conductivity in hydroprimed and SMP treatments after 12 and 24 hours. During emergence tests, the SMP treatment for 24 hours reduced the mean emergence time and also recorded the highest final emergence. The greatest root and shoot lengths were however recorded in hydroprimed seeds after 24 hours. It was concluded that SMP for 12 and 24 hours was the most effective treatment in improving overall germination and seedling emergence of rapeseed.