Dr. Sjoerd Duiker

Professor of Soil Management and Applied Soil Physics
Penn State University
408 ASI Builidng
University Park, PA 16802
United States
(w) (814) 863-7637


GNE18-186 Symbiotic Nitrogen Fixation in Non-legumes: N-supply, Yield and Quality Effects in Tomato and Pepper
ONE16-287c Promoting cover crops on grain and vegetable farms in Pennsylvania