Empirical Analyses of Impacts of R&D and Environmental Factors on Agricultural Productivity in Japan, Korea, and Taiwan

我打算在2000-2002年期间的最后三年研究日本、韩国和台湾的研发和推广(简称R&E)和环境因素对农业生产力的影响。然而，研究发现，为日本建立和更新农业生产数据库是必要的。正因为如此，韩国和台湾农业的基础数据库仍在完善中，以便与日本案例相对应地进行实证分析。因此，我不得不决定推迟对后两个国家的实证分析。相反，由于我现在有一个很好的日本农业数据库，我专注于对日本的实证分析。首先，我们从产出空间和投入空间两个方面分析了R&E对日本农业生产率和技术偏差的影响。其次，我们将分析扩展到R&E和预留计划对农业生产率的影响--第三，我们还基于时间序列分析分析了日本农业资本投资与生产率之间的因果关系。使用模型中的环境因素，我仍然无法获得统计上合理的结果。我需要更多的时间才能在这样的分析中获得成功的结果。对于韩国和台湾来说，建立良好的农业研究与开发数据库一直非常困难。无论如何，由于定量研究环境因素对农业生产力的影响是非常具有挑战性的，我将在未来继续这方面的研究。

I intended to study for the last three years of the 2000-2002 period the impacts of R&D and extension (R&E in short) and environmental factors on agricultural productivity in Japan, Korea, and Taiwan. However, it was found that constructing and updating the database for agricultural production for Japan. Because of this, it is still on the way to complete the basic databases for Korean and Taiwanese agriculture for empirical analyzes corresponding to Japanese case. Thus, I had to decide to postpone the empirical analyzes for the latter two countries. Instead, since I have now a good database for Japanese agriculture, I have concentrated on empirical analyzes for Japan.The research have been done in three directions. First, we analyzed the impacts of R&E on Japanese agricultural productivity and technological biases both in the output and input spaces. Second, we extended the analysis to investigate the impacts of R&E and set-aside programs on agricultural productivity- Third, we also analyzed the causality between capital investment and productivity in Japanese agriculture based on time series analysis.Unfortunately, I could not incorporate environmental factors into the analyzes in a successful fashion. I still could not obtain statistically reasonable results using environmental factors in the models. I will need more time for a successful result in such an analysis. For Korea and Taiwan, it has been very difficult to construct good databases of R&E in agriculture. In any case, since it is very much challenging to study quantitatively the effects of environmental factors on agricultural productivity, I will continue this research in the future too.