中文摘要：

与美国相比，我国纳米技术在农业中的应用存在着技术水平、应用范围上的差距，两国共同面临着不确定性风险、健康和环境风险、风险评估认知缺乏等挑战。美国纳米技术在农业领域快速发展，得益于其雄厚的技术基础、巨额的资金投入和长期稳定的政府促进政策，通过中关两国政策分析比较，归纳出我国促进纳米技术应用于农业的政策启示。最后展望了纳米技术在未来农业中的应用与发展前景。

英文摘要：

By comparing China with America, this paper explains the big gap between the two countries in the aspect of nanotechnology level and the application of nanotechnology in agricultural fields, as well as the common challenges for China and America. Study finds that the rapid development of nanoteehnology in American agriculture lays in strong technical foundation, significant capital investments and government＇s promotion policies. Subsequently, it summarizes some policy inspiration for China, and proposes future prospects in the end.