敷草雑草からの溶脱成分の生物活性

概要

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Biological activities of leachates from dried and decayed materials of several herbs were tested to survey the physiological effects of grass mulch in orchards. Peach seedlings were grown in the mixture of soil and cut foliage of Artemisia princeps, Rumex japonicus, Polygonum longisetum, Cyperus roturdus, Digitaria sanguinalis, Trifolium repens or Lolium multi-florum : Growth ratio of shoot/root increased in all the mixture treatments, though it varied depending on the treated species, showing lowest ratio in P. longisetum. Aqueous extracts of ground foliage of D. sanguinalis, A. princeps. P. longisetum, R. japonicus, T. repens and Amaranthus viridis, and extract of ground rice-straw were assayed for their activities using lettuce : Promotion in shoot elongation and inhibition in root elongation were observed, though the rate varied with the concentration, in most of the extracts except for P. longisetum and rice-straw. P. longisetum decreased both shoot and root length of lettuce plants, whereas the rice-straw increased them. These original activities changed as the degradation in soil proceeded, exhibiting similar fluctuation pattern in each treatment. The above results proved to be partially related to nitrogen levels of the extracts or the leachates, but participation of other factors was also suggested.
日本雑草学会の論文
1981-11-25