American Society of Agronomy

Physiology and Determination of Crop Yield

By K. J. Boote, J.M. Bennett, T.R. Sinclair, K. J Boote, G.M. Paulsen

Methods of Soil Analysis

By A. Page

Sulfur in Agriculture

By M A Tabatabai

Impacts of El Nino and Climate Variability on Agriculture: Proceedings of a Symposium Sponsored by Division A-3 of the American Society of Agronomy in Beltsville, MD, 21 Oct., 1998

By Jeffery J Volenec, Jerry L Hatfield