TN Total Nitrogen and TP Total Phosphorus
total Nitrogen TN concentration
changes in soil organic carbon and total nitrogen
Content of total nitrogen
Dynamics of soil organic matter and total nitrogen
estimation of the total nitrogen
Kjeldahl distillation method for total nitrogen
leaf total nitrogen concentration
Rate constant of mineralization Study on the Spatial Variability of Soil Total Nitrogen in
Ratio of total nitrogen to nicotine
Soil organic carbon and total nitrogen
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
soil total nitrogen STN
sum total =total amount
the recovery ratio of total nitrogen