Ecological Characteristics of Important Weed Species in Sown Meadows

NEMOTO Masayuki

doi:10.3719/weed.24.12

To obtain high yield of forages, tall-growing weeds should be suppressed in sown meadows. For that, ecological characteristics of Erigeron annuus and Artemisia princeps were studied as important tall-growing weeds. 1) The response of isolated weeds. Their regrowth after cutting was affected by the frequency and date of cutting: 5 times cutting, one cutting in June, and one cutting in July. Except the July-cutting plot, E. annuus regenerated shoots and formed flower-buds soon after cutting. But the cutting treatment delayed the flowering, therefore the growing period was extended. E. annuus in the July-cutting plot was remarkably inhibited in its regrowth and died. A. princeps regenerated shoots and emerged sprouts from the top of a rhizome. They did not form flower-buds on new shoots. 2) Yearly change of the biomass of E. annuus and A. princeps in sown meadows. In sown meadows, in addition to the frequency and date of cutting, forage species affects the regeneration of E. annuus and A. princeps after the cutting remarkably. The biomass of E. annuus was maintained in the frequent cutting plot and was decreased in the no-cutting plot. Under the infrequent- or no-cutting conditions, E. annuus was covered by forage grasses growing luxuriantly. By contrast, A. princeps became a dominant weed in no- or infrequent-cutting plots. The regeneration rate of young shoots of A. princeps was lower than forage grasses, therefore it was suppressed by sown grasses in the frequent cutting plot.

Ecological Characteristics of Important Weed Species in Sown Meadows

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