Results showed that soil total nitrogen and organic nitrogen fractions were significantly influenced by long-term application of chemical fertilizer and manure.
结果表明，长期施用化肥和有机肥对土壤全氮和土壤有机氮组成有显著影响。
Results showed that soil total nitrogen and organic nitrogen fractions were significantly influenced by long-term application of chemical fertilizer and manure.
结果表明，长期施用化肥和有机肥对土壤全氮和土壤有机氮组成有显著影响。
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