total nitrogen短语¹⁸⁰⁰⁹⁸⁺¹ 基本例句 总氮 The results showed that straw application increased crop yield, soil organic carbon accumulation, soil total nitrogen and phosphorus content as well as phosphorus activation. 结果表明，秸秆还田提高了作物产量，增加了土壤有机碳积累和土壤氮磷含量，且能活化土壤磷素。 dictall