SEPTEMBER 4, 2018 6:06 PM
Researchers from Washington State University and the University of Connecticut are working to improve nitrogen recommendations to fit individual fields. The new model is based on aerial imagery and digital soil maps to determine cornstalk sampling areas which are analyzed with a cornstalk nitrogen test. The study was conducted from 2008-2014 on more than 1600 fields in Ohio, Illinois, Indiana and Michigan. The samples that were collected in yellow or light green areas had a 56 percent deficiency in nitrogen values, compared to 34 percent in green areas. 25 percent of samples in the yellow and light green areas had excessive nitrate values, indicating stressors other than lack of nitrogen. The authors found that there are three significant effects on N sufficiency levels. To find out what the three main effects are, click here!