Nitrogen and phosphorus effects on water use efficiency of spring wheat grown in a semi-arid region of the Canadian prairies.

The article presents a study which evaluates the effects of fertilizer nitrogen (N) and phosphorus (P) on water use efficiency (WUE) and precipitation use efficiency (PUE) of spring wheat (Triticum aestivum L.) grown in semi-arid southwestern Saskatchewan. The study uses a crop rotation experiment with continuous wheat (Cont W) and fallow-wheat-wheat (F-W-W). Results show that WUE calculation using yield (Y)/water use (WU)/potential water use (PET) was the most suitable for continuous cropping.