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| Author(s): | Takahashi, H.;
Takahashi, Y.;
Honda, T.;
Negishi, S. |
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| Author Affiliation: | Central Agricultural Experiment Station, Konosu, Saitama, Japan |
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| Title: | Studies on the successive cultivation of Italian ryegrass and barnyard grass on a paddy field converted to upland conditions. 3. The effect of some environmental conditions on the seed viability of barnyardgrass |
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| Source: | Journal of Japanese Society of Grassland Science. Vol. 20, No. 2, 1974, p. 73-78. |
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| Keywords: | TIC Keywords: Echinochloa crusgalli; Seed germination; Dormancy; Environmental effects
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| Geographic Terms: | Japan |
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| Abstract/Contents: | Periodical changes of viability of barnyardgrass (Echinochloa crus-galli var. caudata) seed were investigated using air-dried seeds stored at 3 different temperatures and seeds kept in soil. Seeds maturing in autumn were dormant but there was no secondary dormancy. In air-dried seeds, the dormancy period ranged from 3 to 7 months for indoor storage (10-20 deg C in winter), from 6 to 11 months outdoors (-2.1 to 30.7 deg ) and from 1 to 2 years for low-temperature storage (5 deg ). About 50% of seeds kept in soil began to lose their dormancy within 1 month of shedding and germinated under alternating temperatures (30 deg /20 deg ); dormancy of all seeds had been broken by the following Feb.-Apr. Air-dried seeds stored inside or outdoors rapidly lost viability at high temperatures in the 2nd or 3rd summer after harvest; they survived for )4 years, however, when kept at low temperatures. 85-90% of seeds in the top 0.5 cm of the soil emerged naturally from late Apr. to Sept. of the following year and by the 2nd year 50% of seeds in the 0.5-3 cm layer had also emerged. Most seeds at a depth of )3 cm in the soil died within 3 years. Viability in the soil was promoted by humid or submerged conditions. F.en s. (See also preceding abs.). |
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| Language: | Japanese |
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| References: | 8 |
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| Note: | Summary appears in English |
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| ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Takahashi, H., Y. Takahashi, T. Honda, and S. Negishi. 1974. Studies on the successive cultivation of Italian ryegrass and barnyard grass on a paddy field converted to upland conditions. 3. The effect of some environmental conditions on the seed viability of barnyardgrass. (In Japanese) Journal of Japanese Society of Grassland Science. 20(2):p. 73-78. |
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