Establishment of Kentucky bluegrass (Poa pratensis L.) pasture in Hokkaido. 1. effect of seeding rate, some methods of seed bed preparation and trimming on germination and early growth of seedlings

摘要

Effect of seeding rate, chemical control of weeds, firming methods of seed bed and trimming on germination and early growth of seedlings were determined to accelerate establishment of Kentucky bluegrass (Poa pratensis L., KB) pasture in Hokkaido. Increase in seeding rate from 30 to 240 kg/ha reduced the individual growth of KB seedlings, although raised productivity in unit area. Thus, less seeding rate was recommended to protect seedlings from pulling and trampling damage by cattle grazing. In the30 kg/ha of seeding rate, firming seed bed with Cambridge roller provided much more KB seedlings than that with smooth roller. Trimming increased the number of tiller, but decreased the growth of aerial part and rhizome. It controlled only annual weeds.However, Glyphosate application just before seeding controlled not only annual weeds but also perennial weeds such as dock. Therefore, Glyphosate application just before seeding with 30 kg/ha rate, firming seed bed with Cambridge roller and no trimmingwas recommended to accelerate establishment of KB pasture in Hokkaido.