我们非常荣幸地邀请到了国际食物政策研究所(IFPRI)Senior Scientist游良志博士给我们作学术报告。热诚欢迎广大教师、研究生以及其他有兴趣的人员参加。具体事项通知如下：

报告题目：A Tale of Two Countries: Spatial and Temporal Patterns of Rice Productivity in China and Brazil

大米生产的时空类型：中国与巴西的比较

报 告 人：Dr. Liangzhi You

Senior Scientist of

Environment and Production Technology Division

International Food Policy Research Institute

时 间：2008年1月14日(星期一)

下午 3：30—5：00

地 点：明德主楼9层931会议室

36365线路检测中心

2008年1月10日

Abstract：This paper looks at differences in spatial and temporal variation of rice yields in China and Brazil. We find that rice yields in China have converged over time and that rice production has become more and more homogeneous. In contrast, rice yields in Brazil have diverged overtime, primarily due to variations in upland rice yields. Three hypotheses are put forward to explain the different behaviors of rice yields in Brazil and China: 1) Differences in production systems (i.e. irrigated in China v.s upland in Brazil); 2) Changes in rainfall patterns and 3) Bias in agricultural R&D towards irrigated rice. Our empirical analysis provides support to the first two hypotheses by establishing that upland rice is subjected to much more variation in yields than irrigated and that changing rainfall patterns affect mostly upland rice. We also provide evidence of the bias towards irrigated systems by looking at the patterns of varietal release.

Keywords: rice productivity, spatial convergence, technology spillover, China, Brazil

JEL: O33, O57, Q16, R12