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| Publication Type:
| Report |
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| Author(s): | Komatsu, Toshinori;
Suzuki, Shinji |
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| Author Affiliation: | Pasture Plants Division, National Grassland Research Institute, Nishinasuno, Tochigi, Japan |
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| Title: | IV. Seedling vigour in orchardgrass seeds during development and ripening under different temperature conditions |
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| Article Series: | Studies on seed development and ripening in temperate grasses, part 4 |
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| Source: | Bulletin of the National Grassland Research Institute. Vol. 21, January 1982, p. 14-18. |
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| Publishing Information: | Nishinasuno, Tochigi, Japan: s.n. |
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| # of Pages: | 5 |
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| Abstract/Contents: | "In the first report in this series it was demonstrated that the course of development of the individual seed of Italian ryegrass was divided into five stages, and optimum stage of seed harvesting was at the end of the third stage of seed development and ripening. The present studies were undertaken to elucidate the optimum time for seed harvest of Italian ryegrass grown in the field. In 1979, certified seed of three cultivars of Italian ryegrass, 'Waseaoba', 'Yamaaoba', and 'Hitachiaoba' was sown in drills 80 cm apart in three replicates. A basal fertilizer dressing of 0.8 kg N/a, 0.8 kg P2O5/a and 0.8 kg k2/a was applied in the autumn of the seeding. To estimate the seed yields three rows were harvested at five different stages of crop maturity. The seed samples were tested for moisture content, 1000-seed weight, germination capacity and seedling vigour. The four characters were measured to estimate seedling vigour: (1) plant height; (2) number of leaves; (3) number of tillers and (4) plant top weight. The results obtained were as follows: 1. Maximum seed yield of all the cultivars used was obtained at 43-45% moisture level, where 28-59% of heads in the crop were brown, and where 22-73% of heads in the crop showed shedding loss. Thereafter seed yields decreased as moisture content decreased and seed shedding of the crop increased. 2. The germination was over 90% in all seed samples harvested at different stages of ripening. 3. In all cultivars the seedlings from seeds harvested at over 47% moisture level were lower in plant height and plant top weight than those of mature seeds. The seedlings from seeds harvested at 43-45% moisture level, however, were equal to those from mature seeds in plant height and plant top weight, with the exception of plant top weight at 30 days after emergence in Yamaaoba. There was no difference in number of tillers among seedlings of seeds harvested at different stages of ripening. 4. Seed yield, germination and seedling vigour showed that optimum time for seed harvest was at the 43-45% moisture content. 5. The relationship between seed yield and moisture content suggested that moisture content could be used as a guide to the starting date of harvesting operations." |
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| Language: | Japanese |
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| References: | 12 |
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| Note: | English summary as abstract
Tables |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Komatsu, T., and S. Suzuki. 1982. IV. Seedling vigour in orchardgrass seeds during development and ripening under different temperature conditions. (In Japanese) Bull. Natl. Grassl. Res. Inst. 21:p. 14-18. |
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