Relationship between water use and nitrogen use efficiency discerned by 13C discrimination and 15N isotope ratio in bread wheat grown under no-till

Tillage practices affect soil water and nitrogen supply to bread wheat grown under rainfed conditions. It may, therefore, affect grain yields and 13C/12C ratio or δ13C, expressed as Δ13C discrimination in photosynthesis and δ15N natural abundance by the wheat crop. To assess whether Δ13C and δ15N natural abundance can be used to evaluate the tillage and N use effects on wheat crop yield, N uptake, and nitrogen use efficiency (NUE), we examined...