The author introduce a new type efficient humic acid compound fertilizer with N and K.The fertilizer is synthetized by mixing chemical fertilizer with N and K into weathered coal.是什么意思_The author introduce a new type efficient humic acid compound fertilizer with N and K.The fertilizer is synthetized by mixing chemical fertilizer with N and K into weathered coal.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句