These use the word 'nutrition' rathe than agriculture, but the methods used here could be applied to governance of agricultural policies and practice, and they anyway include respondents from the ag sector. Hope these are useful to you:
1. Namirembe G, Shrestha R, Webb P, Houser R, Davis D Baral K, Mezzano J and Ghosh S. 2020. Measuring Governance: Developing a Novel Metric for Assessing How Relevant Officials Translate Nutrition Policies into Practice in Nepal. Int. Jou. Health Policy and Management. http://www.doi.org/10.34172/ijhpm.2020.135.
2. Webb P, Pomeroy-Stevens A and Lamstein S (Editors). 2016. Strengthening Policy Actions and Governance for Nutrition. Food & Nutr. Bull. (Supplement), 37 (S4). http://journals.sagepub.com/toc/fnba/37/4_suppl.
3-e concept (economy, efficiency, effectiveness), but, according to me, this 3-e concept has to be enriched by another three e-s (equity, equality, ethics) and become 6-e concept (economy, efficiency, effectiveness, equity, equality, ethics) - only in this case it sounds good socially, and not purely economically.