Evenness of Nitrogen Application
Uneven application of nitrogen fertilizer is a longstanding problem that is getting worse. The main causes of uneven N application are:
1) Anhydrous ammonia manifolds that distribute N unevenly to knives.
2) ‘Dusty’ dry N fertilizer (urea or ammonium nitrate) spread with spinner spreaders. This problem is getting worse due to increasing imports of dry N fertilizer, leading to more handling (augering) and breakdown of prills or granules into smaller pieces. The smaller pieces can’t be spread as far as larger ones, and N rate is higher in and near the applicator path.
Uneven Nitrogen Application Articles