The hydrometer is an indirect method of estimating total nitrogen and phosphorus, while conductivity meter can estimate ammonia nitrogen and total potassium.是什么意思_The hydrometer is an indirect method of estimating total nitrogen and phosphorus, while conductivity meter can estimate ammonia nitrogen and total potassium.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句