Nitrogen fertilization for young established hybrid hazelnuts in the Upper Midwest of the United States of America.

The article focuses on a study which assessed nitrogen (N) responses to variable rates of N applications to young established hybrid hazelnuts in the Upper Midwest of the U.S. trials were done in seed-propagated hybrid hazelnut plantings in Minnesota from 2003 through 2005. Results indicate variations in management system and soil conditions among the four field sites considered for the study. It was revealed that nitrate and ammonium were correlated with N application rates.