leaf total nitrogen concentration  叶片全氮浓度

soil total nitrogen TN  土壤全氮

TN Total Nitrogen and TP Total Phosphorus  总氮总磷

Total nitrogen TN  总氮

changes in soil organic carbon and total nitrogen  土壤有机碳氮的变化

Content of total nitrogen  全氮含量

Dynamics of soil organic matter and total nitrogen  碳氮变化

estimation of the total nitrogen  全氮估测

Kjeldahl distillation method for total nitrogen  凯氏消化-蒸馏法定氮

leaf total nitrogen  叶片全氮

Rate constant of mineralization Study on the Spatial Variability of Soil Total Nitrogen in  矿化速率常数

Ratio of total nitrogen to nicotine  氮碱比

River total nitrogen  河流总氮

Soil organic carbon and total nitrogen  碳氮; 土壤有机碳、总氮

Soil total nitrogen  土壤总供氮量; 微生物氮; 土壤全氮; 全氮; 土壤全氮含量; 土壤总氮

soil total nitrogen and total phosphorus  土壤氮磷

soil total nitrogen STN  土壤全氮STN

sum total =total amount  总计

the recovery ratio of total nitrogen  总氮收率