First published in 1995. Based on a detailed adjustment for the quality of inputs and outputs, this study develops state-level measures for total factor productivity growth in US agriculture which are used to determine (i) the presence and determinants of convergence across states; (ii) the contribution of individual factors of production to productivity growth; (iii) the importance of spillovers across states; (iv) the economic effects of, returns to, and factor biases of research and extension. This title will be of great interest to students of economics and agriculture.