水田における野生ヒエの生育と種子生産

概要

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Seed production of Echinochloa spp. was examined in both rice-fields, direct-sown and transplanted with young seedlings. ( 1 ) The heading time of each species or sub-species in Echinochloa spp. was as follows in the earlier order; Echinochloa crus-galli var. praticola. E. crus-galli var. crus-galli without awn. E. crus-galli var. crus-galli with awn. E. oryzicola, E. crus-galli var. formasensis. The variation of the period from emergence to heading was the largest with E. crus-galli var. formasensis and the smallest with E. crus-galli var. praticola. ( 2 ) Seed number per plant of E, oryzicola was about 3,000 grains when the plants emerged within 20 days after rice seeding and about 2,000 grains when emerged at the transplanting time. In both cultures the seed number was less when the plants emerged later, and the seeds were not produced when the plants emerged 50 days after the rice seeding or 30 days after the rice transplanting. In the transplanting culture of young seedlings, seed number per plant of E. oryzicola was not different among plant density of 5 to 40 plants per sq. meter. ( 3 ) A close relationship between top dry weight of E. oryzicola and seed number was found, but seed number per unit top dry weight was different according to the emerging time.
日本雑草学会の論文
1978-12-25