メヒシバ種子の休眠覚醒, 発芽特性および死滅に及ぼす埋土位置の影響

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Experiments were carried out in an upland field located at Kurashiki in JAPAN, during the period from November 26, 1983 to March 31, 1984. Crabgrass seeds (D. adscendens HENR. ) were buried at a depth of 0, 1, 2, 5 and 10cm in unshaded (bare) soil and at a depth of 1 cm in soil shaded with cheese cloth. They were exhumed six times during the burial periods, and were used for germination tests. Soil temperature and moisture at each depth were also measured. To analyze the effects of the temperature and moisture on the dormancy breaking of crabgrass seeds, a laboratory experiment was carried out. Seed dormancy was easily broken by burial at a depth of 5, 10cm in bare soil and at a depth of 1 cm in shaded soil. Requirement level of alternating temperature and light for germination decreased markedly for the seeds which were buried at a depth of 5, 10cm below the bare soil and at 1 cm below shaded soil. On March 31, 1984, the mortality of the seeds buried at a depth of 5, 10cm below the bare soil was high and significantry different from that under the other conditions. Considering the temperature and moisture of the soil at which the seeds were buried and based on the results of the laboratory experiment, it was concluded that relatively higher temperature and adequate moisture conditions at a depth of 5 and 10cm below the bare soil may accelerate the dormancy-breaking process of the seeds. The effects of the burial depth on the dormancy, germination and mortality in crabgrass seeds were discussed from the ecological view point.
日本雑草学会の論文
1987-10-30

メヒシバ種子の休眠覚醒, 発芽特性および死滅に及ぼす埋土位置の影響

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