关键词: 甘薯, 异质性视角, 技术效率, 经营主体, 薯区

Abstract: Based on the research data from the main production areas of the fixed observation point demonstration counties of the national sweet potato industrial technology system in 2019, this study used the SFA model to measure the technical efficiency of sweet potato and dissect the differences in the distribution of technical efficiency among different operating agents and sweet potato areas. The Tobit model was used to explore the factors affecting the efficiency of its sweet potato production technology. The results showed that firstly, the average technical efficiency level of the total sample is 0.84. Judging from the average value between the main bodies, from large to small, they are large farmers, ordinary farmers, and cooperatives. By comparing the three sweet potato areas, the technical efficiency values from high to low are the spring and summer sweet potato areas in the north, the summer sweet potato area in the Yangtze River Basin, and the southern sweet potato area. Secondly, from the perspective of heterogeneous operators, cultivated land topography and sweet potato commodity rate have positive effects on their production technology efficiency. Other factors have influencesin different intensities and directions. Thirdly, from the perspective of heterogeneous regions, household labor scale and sweet potato commodity rate have positive effects on the technical production efficiency of the three potato regions. Other factors have influences in different intensities and directions. Finally, this article puts forward policy recommendations to improve the technical efficiency of sweet potato production.

Key words: sweet potato, heterogeneity perspective, technical efficiency, business entity, potato area