E-PhD Seminar Series: Yield Difference between Aman and Boro Rice in Bangladesh
National Economics University
E-PhD Program Seminar Series
Yield Difference between Aman and Boro Rice in Bangladesh
by
Tadashi Sonoda
Professor, Graduate School of Economics
Nagoya University, Japan
Time and Venue
Time: 3.00PM – 4.00PM
Date: Tuesday, August 29th, 2023
Venue: Room 15.01, Level 15, Building A1, National Economics University
207 Giai Phong Road, Hanoi, Vietnam
Abstract
In recent Bangladesh, yield difference between aman rice (produced in rainy season) and boro rice (produced in dry season) has been getting larger. In 2015, boro rice has 42% higher yield than aman rice for high yielding variety. It is well known that production of aman rice is traditionally characterized by moderate adoption rate of local varieties and high dependence on rainfall for a main water source. On the other hand, production of boro rice is characterized by recent introduction of hybrid variety and high dependence on ground water irrigation for a main water source. Consequently, some researchers emphasize importance of different rice varieties or water sources in explaining the yield difference.
This paper uses panel data on 2450 plots in Bangladesh for aman rice and boro rice in 2013/2014 and estimates a stochastic production frontier model. The estimation result is used to evaluate deterministic production frontiers (DPFs) for aman rice and boro rice, to decompose the ratio of mean yields of aman rice and boro rice, and to examine factors explaining the yield difference.
Assuming a true random effects model for the inefficiency and disturbance terms, the ratio of mean yields of aman rice and boro rice is decomposed into a constant representing different intercepts of the DPFs (the first component) and the ratio of mean DPFs representing different use of inputs and shift factors (including water sources and rice varieties) (the second component).
Our empirical results show that ratio of mean DPF for boro rice to mean DPF for aman rice is 1.51 (mean DPF is 51% higher for boro rice) and that the first and second components above are evaluated at 1.35 and 1.12. Furthermore, when the second component is decomposed into indexes of input use, water source, and rice variety, they are respectively evaluated at 1.09, 0.99, and 1.04, implying that input use is more important than water source or rice variety in explaining the DPF difference.
Keywords: Yield difference, aman rice, boro rice, stochastic production frontier, Bangladesh
About presenter
Tadashi Sonoda is a Professor in the Graduate School of Economics at Nagoya University in Japan. His research field includes empirical analysis of agricultural household models and productivity analysis of farm households and manufacturing firms in Asian countries.
About series
This seminar series is part of the E-PhD Program at National Economics University. It targets PhD students, early-career researchers, and senior faculty who find interested in doing research in the areas of economics, business, management, and other inter-disciplinary fields of social science. The series is a platform for the wider research community to exchange ideas, networks and collaborations.
Contact details
Bach Ngoc Thang
Seminar series coordinator
Room 15.04, Building A1
Institute for Sustainable Development
National Economics University
207 Giai Phong Road, Hanoi, Vietnam
M: +84 35 443 1750
E: bnthang@gmail.com, or thangbn@neu.edu.vn
