Campbell, C. A., Zentner, R. P., Janzen, H. H. and Bowren, K. E. (1990) Crop rotation studies on the Cana- dian Prairies. Canadian Gov = t Publ. Centre, Supply & Services Canada, Hull, QC. Publ #184/E, 133 pp.
 Campbell, C. A., Selles, F., Zentner, R. P, McConkey, B. G., Brandt, S. A. and McKenzie, R. C. (1997) Regression model for predicting yield of hard red spring wheat grown on stubble in the semiarid prairie. Canadian Jour- nal of Plant Science, 77, 43-52.
 Campbell, C. A., Zentner, R. P., Gameda, S., Blomert, B. and Wall, D. D. (2002) Production of annual crops on the Canadian prairies: Trends during 1976-1998. Canadian Journal of Soil Science, 82, 45-57.
 De Jong, R., Campbell, C. A., Zentner, R. P., Basnyat, P., Cutforth, H. and Desjardins, R. (2008) Quantifying soil water conservation in the semiarid region of Saskatch- wan, Canada, effect of fallow frequency and N fertilizer. Canadian Journal of Soil Science, 88, 461-475.
 Bauer, A. (1980) Responses of tall and semidwarf hard red spring wheats to fertilizer nitrogen rates and water supply in North Dakota 1969-1974. North Dakota Ag. Exp. Station, Bulletin 510, 112 pp.
 Tanaka, D. L. (1990) Topsoil removal influences on spring wheat water use efficiency and nutrient concentra- tion and content. Transactions of the American Society of Agricultural Engineers, 33, 1518-1524.
 Campbell, C. A., Zentner, R. P., Selles, F., Biederbeck, V. O. and Leyshon, A. J. (1992) Comparative effects of grain lentil-wheat and monoculture wheat on crop pro- duction, N economy and N fertility in a Brown Cher- nozemic soil. Canadian Journal of Plant Science, 72, 1091-1107.
 Deibert, E. J., French, E. and Hoag, B. (1986) Water storage and use by spring wheat under conventional till- age and no-till in continuous and alternate crop-fallow systems in the northern Great Plains. Journal of Soil and Water Conservation, 41, 53-58.
 Campbell, C. A., VandenBygaart, A. J., Grant, B., Zent- ner, R. P., McConkey, B. G., Smith, W., Lemke, R. and Gregorich, E.G. (2007) Quantifying carbon sequestration in a conventionally tilled crop rotation study in south- western Saskatchewan. Canadian Journal of Soil Science, 87, 23-38.
 Lenssen, A. W., Johnson, G. D. and Carlson, G. R. (2007) Cropping sequence and tillage system influences annual crop production and water use in semiarid Montana, USA. Field Crops Research, 100, 32-43.
 De Jong, E. and Cameron, D. R. (1980) Efficiency of water use by agriculture for dryland crop production. Prairie Production Symposium, Soils and Land Re- sources, Advisory Comm. to Can. Wheat Board. Univ. of Saskatchewan, Saskatoon. Oct. 29 - 31, 1980.
 Kersebaum, K. C., Lorenz, K., Reuter, H. I., Wendroth, O., Giebel, A. and Schwarz, J. (2003) Site specific nitro- gen fertilisation recommendations based on simulation. Precision Agriculture. In: Stafford, J., Werner, A. (Eds.), Proc. of the 4th European Conference on Precision Agri- culture.Wageningen Academic Publishers, Wageningen, pp. 309-314.
 Heineman, A. B., Hoogenboom, G. and De Faria, R. T. (2002) Determination of spatial water requirements at county and regional levels using crop models and GIS. An example for the state Parana, Brazil. Agricultural Water Management. 52, 177-196.
 Kiniry, J. R., Arnold, J. G. and Xie,Y. (2002) Applications of models with different spatial scales. In: Ahuja, L. R., Ma, L., Howell, T. A. (Eds.), Agricultural System Models in Field Research and Technology Transfer. Lewis Pub- lishers, Boca Raton, pp. 207-227.
 Kersebaum, K. C., Steidl, J., Bauer, O. and Piorr, H. P. (2003) Modelling scenarios to assess the effects of dif- ferent agricultural management and land use options to reduce diffuse nitrogen pollution into the river Elbe. Physics and Chemistry of the Earth, 28, 537-545.
 Campbell, C. A., Zentner, R. P. and Steppuhn, H. (1987) Effect of crop rotations and fertilizers on moisture con- served and by moisture use by spring wheat in south- western Saskatchewan. Canadian Journal of Soil Science, 67, 457-472.
 Campbell, C. A., Zentner, R. P. and Johnson, P. J. (1988) Effect of crop rotation and fertilization on the quantita- tive relationship between spring wheat yield and mois- ture use in southwestern Saskatchewan. Canadian Journal of Soil Science, 68, 1-16.
 Ayers, K. W., Acton, D. F. and Ellis, J. G. (1985) The soils of the Swift Current Map Area 72J Saskatchewan. Sask. Inst. Pedol. Publ. 86. Extension Division, Univer- sity of Saskatchewan, Extension publ. 481.
 Canada Soil Survey Committee, Subcommittee on Soil Classification (1978) The Canadian system of soil classi- fication. Canada Department of Agriculture, Supply & Services Canada, Ottawa. Ont. Publ. 1646. 164 pp.
 Pelton, W. L., Campbell, C. A. and Nicholaichuk, W. (1967) The influence of freezing and thawing on soil moisture. In: Proceedings Hydrol. Symp. No. 6, Soil Moisture. National Research Council of Canada, Ottawa, ON, pp. 241-263.
 Campbell, C. A., Read, D. W. L., Biederbeck, V. O. and Winkleman, G. E. (1983) The first 12 years of a long- term crop rotation study in southwestern Saskatchewan - Nitrate-N distribution in a soil and N uptake by the plant. Canadian Journal of Soil Science, 63, 563-578.
 Campbell, C. A., Read, D. W. L., Zentner, R. P., Leyshon, A.J. and Ferguson, W.S. (1983) First 12 years of a long term crop rotation study in southwestern Saskatchewan – yield and quality of grain. Canadian Journal of Plant Science, 63, 91-108.
 Campbell, C. A., Zentner, R. P., Selles, F., Biederbeck, V. O., McConkey, B. G., Lemke, R. and Gan, Y.T. (2004) Cropping frequency effect on yields of grain, straw, plant N, N balance and annual production of spring wheat in the semiarid prairie. Canadian Journal of Plant Science, 84, 487-501.
 Campbell, C. A., Zentner, R. P., Selles, F., Jefferson, P. G., McConkey, B. G. Lemke, R. and Blomert, B. J. (2005) Long-term effect of cropping systems and nitrogen and phosphorus fertilizer on production and nitrogen econ- omy of grain crops in a Brown Chernozem. Canadian Journal of Plant Science, 85, 81-93.
 Campbell, C. A. and Zentner, R. P. (1996) Disposition of nitrogen in the soil-plant system for flax and spring wheat-containing rotations in the Brown soil zone. Cana- dian Journal of Plant Science, 76, 407-412.
 Campbell, C. A., De Jong, R. and Zentner, R. P. (1984) Effect of cropping, summerfallow and fertilizer nitrogen on nitrate-nitrogen lost by leaching on a Brown Cher- nozemic loam. Canadian Journal of Soil Science, 64, 61- 74.
 Akinremi, O. O., Jame, Y. W., Campbell, C. A., Zentner, R. P., Chang, C. and De Jong, R. (2005) Evaluation of LEACHMN under dryland conditions. I. Simulation of water and solute transport. Canadian Journal of Soil Sci- ence, 85, 223-232.
 Kersebaum, K. C., Wurbs, A., De Jong, R., Campbell, C. A., Yang, J. and Zentner, R. P. (2008) Long-term simula- tion of soil-crop interactions in semiarid southwestern Saskatchewan, Canada. European Journal of Agronomy, 28, 1-12.
 Ritchie, J. T. (1983) Efficient water use in crop produc- tion: discussion on the generality of relations between biomass production and evapotranspiration. In: Howard M. Taylor et al., (Eds.) Limitations to efficient water use in crop production. American Society of Agronomy, Madison, WI, USA, pp. 29-44.
 Power, J. F., Grunes, D. L. and Reichmann, G. A. (1961) The influence of phosphorus fertilization and moisture on growth and nutrient absorption by spring wheat: I. Plant growth, N uptake and moisture use. Soil Science Society of America Proceedings, 25, 207-210.
 Henry, J. L., Bole, J. B. and McKenzie, R. C. (1986) Effect of nitrogen water interactions on yield and quality of wheat in Western Canada. In: Slinkard, A. E., D. B. Fowler, D. B. (Eds.), Wheat production in Canada - a re- view. Proceedings Canadian Wheat Production Sympo- sium. 3-5 March 1986, Saskatoon, SK, pp. 165-191.
 De Jong Van Lier, Q., Van Dam, J. C., Metselaar, K., De Jong, R. and Duijnisveld, W.H.M. (2008) Macroscopic root water uptake distribution using a matric flux poten- tial approach. Vadose Zone Journal, 7, 1065-1078.
 Campbell, C. A., Selles, F., Zentner, R. P, De Jong, R., Lemke, R. and Hamel, C. (2006) Nitrate leaching in the semiarid prairie, effect of cropping frequency, crop type, and fertilizer after 37 years. Canadian Journal of Soil Science, 86, 701-710.
 Campbell, C. A., Zentner, R. P., Basnyat, P., De Jong, R., Lemke, R., Desjardins, R. and Reiter, M. (2008) Nitrogen mineralization under summer fallow and continuous wheat in the semiarid Canadian prairie. Canadian Journal of Soil Science, 88, 681-696.
 Campbell, C. A., Read, D. W., Winkleman, G. E. and McAndrew, D. W. (1984) First 12 years of a long-term crop rotation in southwestern Saskatchewan - P distribu- tion in soil and P uptake by the plant. Canadian Journal of Soil Science, 64, 125-137.
 Zentner, R. P., Campbell, C. A. and Selles, F. (1993) Build-up in soil available P and yield response of spring wheat to seed-placed P in a 24-year study in the Brown Soil zone. Canadian Journal of Soil Science, 73, 173- 181.
 Campbell, C. A., Zentner, R. P., Basnyat, P., Wang, H., Selles, F., McConkey, B. G., Gan, Y. T. and Cutforth, H. W. (2007) Water use efficiency and water and nitrate dis- tribution in soil in the semiarid prairie, effect of crop type over 21 years. Canadian Journal of Plant Science, 87, 815-827.
 Zentner, R. P. and Campbell, C. A. (1988) First 18 years of a long term crop rotation in southwestern Saskatch- wan - yields, grain protein, and economic performance. Canadian Journal of Plant Science, 68, 1-21.
 Roloff, G., De Jong, R., Campbell, C. A., Zentner, R. P. and Benson, V. M. (1998) EPIC estimates of soil water, nitrogen and carbon under semiarid temperate conditions. Canadian Journal of Soil Science, 78, 551-562.
 Campbell, C. A., Zentner, R. P., Selles, F., Liang, B. C. and Blomert, B. (2001) Evaluation of a simple model to describe carbon accumulation in a Brown Chernozem under varying fallow frequency. Canadian Journal of Soil Science, 81, 383-394.
 Hu, T. and Desai, J. P. (2004) Soft-tissue material proper- ties under large deformation: Strain rate effect. Proceed- ings of the 26th Annual International Conference of the IEEE EMBS, San Francisco, 1-5 September 2004, 2758- 2761.
 Ortega, R., Loria, A. and Kelly, R. (1995) A semiglobally stable output feedback PI2D regulator for robot mani- pulators. IEEE Transactions on Automatic Control, 40, 1432-1436. doi:10.1109/9.402235
 Prasad, A. S. (1982) Clinical and biochemical spectrum of zinc deficiency in human subjects. In: Prasad, A. S. Ed., Clinical, Biochemical and Nutritional Aspects of Trace Elements, Alan R. Liss, Inc, New York, 5-15.