The F-statistic of the first-stage regression (shown in the supplementary material) was highly significant (F-statistic = 22.90; Prob > F = 0.0000) 7 The instrument, cotton cooperative membership, was strongly correlated with the potentially endogenous variable, nitrogen application rate (coefficient = 10.62 with a p value = 0.000).
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Economic incentives to use fertilizer on maize under differing agro-ecological conditions in Burkina Faso.
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