C L Kou

Nitrogen balance and groundwater nitrate contamination: comparison among three intensive cropping systems on the North China Plain.

Fusuo Zhang, X. Ju, P. Christie, 2006, Environmental pollution.

Changes in the soil environment from excessive application of fertilizers and manures to two contrasting intensive cropping systems on the North China Plain.

X. Ju, P. Christie, F. Zhang, 2007, Environmental pollution.