Chemical fertilizer and herbicide are widely used in agricultural production.These chemical substances not only significantly increase crop yields but also result in serious water pollution.This study was conducted to evaluate the effects of three practices(no-tillage,grass hedges,no-tillage and grass hedges) on the loss of nitrogen,phosphorus and atrazine with runoff.The results showed that no-tillage and grass hedges significantly reduced agricultural non-point source pollution.As compared to the control,...