Additionality and the Adoption of Farm Conservation Practices
使用倾向得分匹配法，基于俄亥俄州农民调查数据，评估联邦成本分摊项目对六种保护性实践的额外性，发现不同实践的额外性差异很大，如干草种植的额外性高达93.3%，而保护性耕作仅为19.3%。
We use propensity score matching to estimate additionality from enrollment in federal costshare programs for six practices. We analyze farmer adoption decisions based on farmer survey data in Ohio. We develop a new methodological approach to decompose the average treatment effect on the treated according to relative contributions of voluntary adopters and new adopters. Our results indicate that cost-share programs achieve positive levels of additionality for each practice. But percent additionality varies dramatically between practices. Specifically, percent additionality is highest for hayfield establishment (93.3%), cover crops (90.6%), and filter strips (88.9%), while it is lowest for conservation tillage (19.3%). <i></i>