草地の雑草管理に関する研究 : IV.エゾノギシギシの発芽・初期生育に及ぼす種子のサイズと裸地面積の影響

概要

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Studies were carried out to analyse the effect of seed size and biological space of broadleaf-dock on germination, growth and survival immediately after emergence in a mixture with orchardgrass. Results obtained are as follows. 1. The size of most of the seeds of broadleaf-dock produced in a grazing pasture exceeded 1.0 mm(Table 1). 2. Germination percentage was higher for the large seed size class than for the small size class. The percentage and speed of germination of broadleaf-dock seeds were superior to those of orchardgrass(Fig. 2). 3. In the broadleaf-dock plants with larger seed size profuse growth of top and roots (Table 2) was observed in the early stages. 4. When the biological space of broadleaf-dock was large at emergence and/or located far from orchardgrass, growth was profuse in the early stages(Fig. 3). Even when the size of the biological space at emergence was small, broadleaf-dock was able to continue to grow under such conditions. 5. Due to these ecological characteristics, it is considerd that broadleaf-dock is able to grow at high population density of herbage at the time of pasture establishment.
日本雑草学会の論文
1989-12-25