This study analyzes monthly price data for urea, phosphate rock, diammonium phosphate (DAP), triple superphosphate (TSP), and potassium chloride from the World Bank, covering the period from January 1967 to September 2024. The objective is to investigate interdependencies among major fertilizer...

This paper leverages Sri Lanka's 2021 chemical fertilizer import ban to quantify the costs of restricted fertilizer access for agriculture, trade, and welfare. Leveraging trade and production data, satellite-based yield estimates, and event studies, we document sharp declines in fertilizer...