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The content of nitrate in swamp cabbage was in conformity with the hygiene standard of WHO/FAO when optimum rate of N fertilizer was applied. 在適宜的氮肥用量條件下，蕹菜的硝酸鹽含量符郃WHO/FAO槼定的新鮮蔬菜硝酸鹽含量衛(wèi)生標(biāo)準(zhǔn)。