Rule-of-Thumb Instructions to Improve Fertilizer Management: Experimental Evidence from Bangladesh

Mahnaz Islam and Sabrin Beg

Economic Development and Cultural Change, 2021, vol. 70, issue 1, 237 - 281

Abstract: Heavy government subsidies have led to inefficient application and overuse of fertilizer in Bangladesh. This results in above-optimal costs to farmers as well as to the environment and the public. In a randomized controlled trial, we provide farmers with a simple tool (a leaf color chart) and basic, rule-of-thumb instructions to guide the timing and quantity of urea (nitrogen) application. Treatment farmers reduce urea use by 8% without compromising yield, suggesting significant scope for improving urea management. The results are mainly driven by farmers delaying urea application as returns to urea are low early on in the season and urea applied is likely to be wasted. Cost-effectiveness estimates suggest that each dollar spent on this intervention produces a return of US$2.8 due to reduction of urea use over three seasons, as well as significant environmental benefits. We also find suggestive evidence that optimizing the timing of urea application affects farmers’ yields, plausibly as the intervention allows farmers to reallocate urea application to times when returns to urea are highest.

Date: 2021
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Working Paper: ‘Rule-of-Thumb’ Instructions to Improve Fertilizer Management: Experimental Evidence from Bangladesh (2020)
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