Characteristics of Vegetative Propagation of Common Comfrey (Symphytum officinale) as a Weed in Crop Fields.
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概要
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In the past, common comfrey (Symphytum officinale L.) was cultivated extensively in Japan for medicinal use, as well as for use as a vegetable and feed of domestic animals in the 1960's. In recent years, however, due to the reduced demand for common comfrey production, the plant has tended to remain in crop fields and to behave like a weed.1) Individuals of common comfrey which exhibit various sizes and growing stages formed a dominant population in the field surveyed. Within this population the height and the area occupied by each plant in the reproductive stage tended to be barger than in the vegetative stage (Fig. 1).2) The common comfrey plants which emerged in the field were derived from the buried root fragments remaining in the soil of this field. The fragments can be divided into two types: fragments with or without a crown (Fig. 2). The former developed to the reproductive stage, while the latter remeined in the vegetative stage and in some of them the top of the leaf bud did not sprout on the soil surface (Fig. 3).3) Plant size of common comfrey emerging from former ridges was relatively larger than that from the former furrows. The position of the root fragments under the former ridges was shallower in soil than that under the former furrows (Fig. 4). The proportion of the newly formed underground organs (NUO) to the whole new organs (WNO) was calculated and a positive correlation between NUO/WNO and depth of buried old root fragments was recognized (Fig. 5).
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