EFFECT OF SOWING, HARVESTING DATES AND STORAGE PERIODS ON RICE (Oryzae sativa, L.,) SEED VIABILITY AND SEEDLING VIGOUR | ||
| Journal of Plant Production | ||
| Article 5, Volume 30, Issue 10, October 2005, Pages 5781-5792 PDF (4.03 M) | ||
| Document Type: Original Article | ||
| DOI: 10.21608/jpp.2005.237500 | ||
| Author | ||
| I. F. Mersal, | ||
| Seed Tech. Res. Dept., Field Crops Res. Institute, ARC, Egypt. | ||
| Abstract | ||
| Sowing and harvesting dates as well as storage periods have considerable influence on rice seed quality as measured by seed viability, seedling vigour, 100- seed dry weight, dehydrogenase activity, electrical conductivity, seed moisture content and field emergence. Two experiments were conducted at EI-Sirw Experimental Station, Agriculture Research Center during 2002 and 2003 seasons. The main results could be summarized as follows: Sowing rice seed in early date 25 th April reduced seed viability, seedling vigour and field emergence, while electrical conductivity and seed moisture content were increased. In contrast, sowing date 15 th May improved seed viability, seedlings vigour, 100-seed dry weight, dehydrogenase activity, field emergence and it reduced electrical conductivity and seed moisture content. Harvesting rice plant at the early date 23 day after heading reduced seed viability, seedlings vigour and field emergence but it increased electrical conductivity and seed moisture content. Harvesting date 37 day after heading improved seed viability and seedlings vigour. Increasing storage period decreased seed viability, seedlings vigour, 100-seed weight, dehydrogenase activity, seed moisture content, field emergence and increasing electrical conductivity. Positively significant correlations were found for the most studied traits and sowing dates except for negatively significant correlation with seed moisture content. Furthermore, significantly positive correlations were obtained for all the studied traits with harvesting dates. On the other hand, significantly negative correlations for seed moisture content and electrical conductivity with delaying harvesting dates. Storage periods had significantly negative correlation with the most studied traits excepting electrical conductivity while significant positive correlation was found. Meanwhile germination percentage had insignificant negative correlation. The study suggested, sowing rice (c.v. Giza 178) from (5:15 May) and harvesting 30:37 days after heading and storage until 8 months to obtain high seed viability and seedling vigour. | ||
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