用化肥補氮價格太高。大豆可補充很多氮，各種氣候各種土地都能種，收割方便，存儲久，運輸方便，是唯一可行的固氮輪作農作物。

來源: thore 於 2025-10-04 07:29:36 [舊帖] [給我悄悄話] 本文已被閱讀：次

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