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Fig. 1. Effect of soil extractable Cl^– content (0.0- to 0.2-m layer) on relative grain yield of wheat in 10 sites from the sandy Pampas region fertilized with Cl^–. Each point is the average of two Cl^– fertilizer sources (KCl and NH₄Cl) and two foliar fungicide treatments. The solid line shows the quadratic fitted relationship between variables for the Cl^– unfertilized treatments.