南湖新闻网讯 （通讯员 郑宏运）近日，我校农业产业与技术经济团队发表了关于有机土壤改良剂（Organic Soil Amendments）采纳对农业生产绩效影响的研究成果。该研究利用558个小麦种植户调研数据，分析了有机肥和农家肥等有机土壤改良剂采纳的影响因素及其采纳对作物产量和净收益的影响。研究成果以“Adoption of Organic Soil Amendments and its Impact on Farm Performance: Evidence from Wheat Farmers in China”为题在Australian Journal of Agricultural and Resource Economics发表。

近年来，土壤退化对自然环境、可持续农业发展和粮食安全造成了严重威胁。通过鼓励小农户采纳土壤修复技术来改善土壤质量对提高农业绩效至关重要。该研究主要目标是分析有机肥和农家肥等有机土壤改良剂采纳的影响因素，探讨有机土壤改良剂采纳对作物产量和净收益等生产绩效的影响。

该研究利用内生转换回归模型控制由可观测性因素和不可观测性因素造成的选择偏误问题。研究发现，家庭规模、抚养比、机械拥有情况和无偿劳动力可得性等是影响有机土壤改良剂采纳的重要因素，有机土壤改良剂采纳对小麦产量和净收益存在显著的正向影响。有机土壤改良剂采纳可以增加约22%的小麦产量和24%的净收益。此外，针对生产规模的异质性分析表明，与小规模种植户相比，大规模种植户采纳有机土壤改良剂可以获得更高的小麦产量和净收益。

该研究相关结论对如何促进农户采纳有机土壤改良剂提供了针对性政策建议，并为提高小农户生产绩效提供决策依据。

经济管理学院博士研究生郑宏运为论文第一作者，李谷成教授为通讯作者。新西兰林肯大学的研究人员共同参与了研究工作。该研究得到了国家社科基金重大项目（18ZDA072）的资助。

审核人：李谷成

【英文摘要】

This study examines the determinants of adoption of organic soil amendments (OSAs) such as organic fertiliser and farmyard manure and its impact on crop yields and net returns, using household survey data of 558 wheat farmers in China. We employ an endogenous switching regression model to account for selection bias stemming from both observable and unobservable factors. The empirical results show that household size, dependency ratio, machine ownership and non-paid labour are main factors that determine farmers’ decision to adopt OSA, and the OSA adoption has a positive and statistically significant impact on wheat yields and net returns. In particular, the treatment effects of OSA adoption are to increase wheat yields and net returns by appropriately 22 and 24 per cent, respectively. Moreover, disaggregated analysis by farm size reveals that large-scale households tend to obtain higher wheat yields and net returns than their small-scale counterparts.

论文链接：https://onlinelibrary.wiley.com/doi/10.1111/1467-8489.12406