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1 May 2012 Nitrogen and phosphorus effects on water use efficiency of spring wheat grown in a semi-arid region of the Canadian prairies
R. Kröbel, C. A. Campbell, R. P. Zentner, R. Lemke, H. Steppuhn, R. L. Desjardins, R. De Jong
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Abstract

Kröbel, R., Campbell, C. A., Zentner, R. P., Lemke, R., Steppuhn, H., Desjardins, R. L. and De Jong, R. 2012. Nitrogen and phosphorus effects on water use efficiency of spring wheat grown in a semi-arid region of the Canadian prairies. Can. J. Soil Sci. 92: 573-587. Water use efficiency (WUE) has often been analyzed for semiarid environments, but fallow-containing cropping systems were assessed inappropriately. Further, these short-term studies are unlikely to correctly assess weather variability impacts in such environments. We assessed the impact of fertilizer N and P on water use efficiency (WUE) and precipitation use efficiency (PUE) of spring wheat (Triticum aestivum L.) from a 39-yr long-term crop rotation study in semi-arid southwestern Saskatchewan. In the rotation experiment, continuous wheat (Cont W) with N P or P fertilizer only, and fallow-wheat-wheat (F-W-W) with N P, P only, or N only were studied. We calculated WUE using: (i) Yield (Y)/[water use (WU)/potential water use (PET)]; (ii) Y/WU; (iii) Y/WU with a fallow phase element added; and (iv) Y/harvest-to-harvest precipitation (PUE). The WUEs in the rotation experiment were generally greater for treatments with N P fertilizer, and greatest after an increase of N application coupled with favourable soil water conditions in the final decades of this study. In cases (i) and (ii), WUE for F-W-W was greater than for the Cont W-treatment. In case (iii), the WUEs were 5.7, 4.5, 3.9, 3.6, and 3.6 kg ha-1 mm-1 water for Cont W (N P), Cont W (P), F-W-W (N P), F-W-W (P), and F-W-W (N), respectively. For PUE [case (iv)] the values were 4.0, 3.1, 3.4, 3.0, and 2.9, respectively. We concluded that case (ii) was most appropriate for continuous cropping and case (iii) for systems including fallow, while case (iv) was usable in general.

R. Kröbel, C. A. Campbell, R. P. Zentner, R. Lemke, H. Steppuhn, R. L. Desjardins, and R. De Jong "Nitrogen and phosphorus effects on water use efficiency of spring wheat grown in a semi-arid region of the Canadian prairies," Canadian Journal of Soil Science 92(4), 573-587, (1 May 2012). https://doi.org/10.1139/CJSS2011-055
Received: 1 June 2011; Accepted: 1 January 2012; Published: 1 May 2012
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KEYWORDS
Blé de printemps
dfficience de l'utilisation des pré cipitations
Efficience d'utilisation de l'eau
engrais
fertilizer
jachère d'éte
precipitation use efficiency
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