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Comparison of seed priming methods for germination in sorghum (Sorghum bicolor (L.) Moench)
This study was conducted to affirm the potential of seed priming techniques for optimizing mechanized growing technologies to maintain production of sustainable small cereal crops. Seed priming conditions were preliminary tested in laboratory. Sorghum seeds were hydroprimed and osmoprimed comprising a total of 33 treatments of different priming combination along with control. Seed primed in aerated solution of distilled water, PEG8000 (-0.15 MPa and –0.3 MPa), KCl(1% and 2%), KH2PO4 (0.5% and 1.0%), KNO3 (1.0% and 3.0%), CaCl2 (1.0% and 3.0%) solutions for 6, 12, 24 hours at 15℃. Maximum seed germination percentage, germination rate and reduced mean germination times (MGT) were observed when the seeds primed by CaCl2 1.0% for 24 h, whereas the lowest germination percentage observed in seeds which treated with KNO3 3% solution. Priming improved the MGT, germination index, and germination rate of all primed seeds statistically comparing to control. The MGT reduced by increase of treatment time. Further studies for field performance of primed seeds are needed.
