Effects of Aqueous Extracts from Rice Straw on the Growth of Chinese Milk Vetch(Astragalus sinicus L.)

Japanese Journal of Crop Science

Hisao NAKANO¹  Miyuki HIRAI¹ 

关键词: Allelopathy;    アレロパシー;    Chinese milk vetch(Astragulus sinicus L.);    稲わら被覆;    Flooded condition;    稲わら水抽出液;    Germination;    夏期湛水;    Rice straw;    生存;    Seedling growth;    発芽;    Survival;    幼植物生育;    Water-soluble chemicals;    レンゲ;   

DOI  :  10.1626/jcs.69.470

学科分类：农业科学（综合）

来源: Nihon Sakumotsu Gakkai / Crop Science Society of Japan

【 摘 要 】

Under the conditions of a continuously rice and Chinese milk vetch rotation system during the nontillage cultivation, the vegetation of Chinese milk vetch become poorer year by year. The effects of the aqueous extracts from rice straw on the germination and on the growth of Chinese milk vetch were examined. In the 1st experiment, allelopathic rice-straw substances extracted with water(RE)were added to petri dishes at 7 concentrations, and Chinese milk vetch was seeded 2 days after imbibition. The higher the RE concentration, the lower the germination and growth rates, especially the rate of growth of the radicle. At a high RE concentration, the tip of the hypocotyl became black, and all seedlings died within 12 days after seeding. In the 2nd experiment, Chinese milk vetch was sown on a tray with soil, and covered with 2 kinds of rice straw, one with RE removed(RES), and the other with RE retained(CS). The growth of the seedlings in CS was significantly poorer than that in RES. At 20 days after seeding, the survival percentage was about 100% and 30% in RES and CS, respectively. In the 3rd experiment, pots covered with rice straw(RS)or without rice straw(NS)were placed in a greenhouse under a flooded condition from July to September, and at 20 days after natural drying the seedlings of Chinese milk vetch at the cotyledon stage were transplanted in the pots. The growth in RS was inferior to that in NS, especially in radicles. These results indicated that the extracts from rice straw inhibited the germination and growth of Chinese milk vetch. It is considered that the water-soluble allelopathic substances in rice straw were accumulated in the field during nontillage cultivation of Chinese milk vetch and rice.

【 授权许可】

Unknown