• 作者： 高德錚; 林安秋
• 作者服務機構： 台中區農業改良場; 國立台灣大學農藝研究所
• 中文摘要： 從民國66年11月起，對高屏地區進行5年的禾根大豆根瘤發育狀況之調查發現 ： (1)營養盛期至開花期間，植株根瘤數平均為 24.8 個，且有效根瘤比率較低僅32.6%。 (2)根瘤在不同土層間分佈不均，70%左右之根瘤著生於地表下0～10公分之根系中。土壤質地及通氣性與植株根系發育和根瘤分佈頻度之變遷有相關性。 (3)根瘤分佈頻度之模式，在4個大豆品種及5個取樣地區間大致相同，甚至取樣年度間差異亦不顯著。 (4)豆農每公頃施用20～50公斤氮素，造成豆葉濃綠，根瘤數稀少及有效根瘤比率低落。
• 英文摘要： A non一tillage of rice一stubble beanculture was annually practised imme－diately after the second rice erop in thesouthern part of Taiwan (Kao-Ping).The distribution and development ofsoybean nodules which were collectedfrom 616 locations of Kao-Ping prefec-tures were under a five-year's survey.Results were summarized as follows: (1) While soybeans were at vege-tative stage to flowering stage, thenodules per plant was about 24.8 inaverage and only 32.8% of themwere detected as effective ones. (2) More than 70% of nodules weregathered together in the 0-10 cm ofsoil depth of root system. This distri-bution pattern was no significant dif-ferences among 4 soybean cultivars,5 location sites and sampling years.Moreover, the aeration capacity andsoil texture also caused to retard theroot growth and nodular distribution. (3) Farmers　always supply toomuch nitrogen fertilizer (20-50 kg N∕ha) so as to result in dark green insoybean leaves. Besides, this heavynitrogen application rate was statisticallydecreased in nodule development andeffectiveness.
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