We mixed the activated carbon, which effectively adsorbs the allelochemicals of asparagus (
Asparagus officinalis L.), into the substrate during the seedling stage, and investigated its effects on the growth of asparagus. As a result, the mixture of the activated carbon with the substrate led to the production of asparagus seedlings with a high quality while reducing allelopathy. We also investigated the effects of activated carbon mixed into the substrate on the growth of 30 species of eight different families, and found that the growth of tomato (
Lycopersicon esculentum Mill.), prairie gentian (
Eustoma grandiflorum (Raf.) Shinn.), lettuce (
Lactuca sativa L. Capitata Group.), cucumber (
Cucumis sativus L.), cabbage (
Brassica oleracea L. Capitata Group), broccoli (
Brassica oleracea L. Italica Group) and asparagus was increased by mixing the substrate with activated carbon compared to growth in those species without activated carbon. The mixture of activated carbon into the substrate during the seedling stage would be useful for promoting the growth of certain plants, in which allelochemical activity is reported to be high.
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