英文文献：Productivity effects of sustainable intensification: The case of Urea deep placement for rice production in Niger State, Nigeria:
英文文献作者：Liverpool-Tasie, Lenis Saweda O.,Adjognon, Serge,Kuku-Shittu, Oluyemisi
英文文献摘要：
This paper uses household data to explore the yield effects of an intensification practice called urea deep placement (UDP) in Nigeria. The propensity score matching and instrumental variables methods provide consistent evidence of a positive and significant effect of UDP on rice yields. The Rosenbaum sensitivity analysis reveals that these results are not likely driven by unobservable factors. The paper also finds that farmers’ yields are further enhanced by adhering to several prescribed practices, confirming the potential for UDP to significantly improve rice yields.