This study proposes an approach similar to that of Lichtenberg and Zilberman to model the impact of control agents (pesticides, herbicides) on potato production. We estimate simultaneously a marketable output equation as well as three damage abatement functions. Empirical results show that fertilising elements (nitrogen, phosphorus,;potassium and magnesium) do not have statistically significant impacts on the potential output of potatoes. Significant effects are obtained in the damage abatement functions but only for phosphorus and potassium. These latter variables show opposite effects in altering damages caused by the small size of the tuber. Hence phosphorus;increases them while potassium reduces them. Several variables reflecting alternative management practices have also been included in the model but only few of them are statistically significant.


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