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*Manuscript Click here to download Manuscript: Manuscript.doc Click here to view linked References Effect of non-uniform sprinkler irrigation and plant density on simulated maize yield 1 2 ABSTRACT 3 4 Commercial field conditions under sprinkler irrigation include low irrigation uniformity and non 5 uniform plant density, which can affect the crop yield and the environmental impact of irrigation. 6 The effect of sprinkler irrigation and plant density uniformity on maize grain yield variability 7 under semiarid conditions was evaluated and the relevance of spatial variability of these two 8 variables on the simulation of maize grain yield with the DSSAT-Ceres-Maize model was tested. 9 Experimental field data from three maize growing seasons (2006, 2009 and 2010) with 10 nighttime or daytime sprinkler irrigation was used to test the model performance. Yield, irrigation 11 depths and plant density distribution were measured in 18 x 18 m plots divided in 25 subplots. 12 Regression analysis showed that variability of plant density and seasonal irrigation depth (due 1