K、Na流失量
the amount of K and Na losses
单位产量总氮流失量
TN loss per unit crop yield
氮磷流失量
N and P loss
excretion of nitrogen and phosphorus
流失量监测
Monitoring annual soil loss
农田氮素流失量
amounts of runoff losses of nitrogen
区域土壤允许流失量
regional soil loss tolerance
水土流失量
Amount of soil erosion
quantity of soil and water loss
soil erosion
washed-away volume of water and soil
土壤年流失量
Monitoring annual soil losses
forecasting