Agricultural development is an activity with many ethical problems. Nowhere are these problems more evident than in tropical forest regions, like the Amazon. This paper examines ethical issues associated with a particularly controversial activity in the region: pastures research. The paper discusses three general critiques of Amazonian agricultural development: ecological, social equity and cultural survival. A particular pastures research project is then examined. The paper concludes that pastures research can be an ethically sound activity when carried out in a manner (...) that is sensitive to the social, cultural, and ecological context. The paper concludes that ethical decisions regarding agricultural research are context sensitive. A better appreciation of potential ethical dilemmas can be obtained by seeking participation by a variety of social actors in designing and carrying out agricultural research. (shrink)