Agronomic Assessment of a Controlled-Release Polymer-Coated Urea-Based Fertilizer in Maize

Increasing nutrient use efficiency of fertilizers is one of the major challenges to improve crop yields and minimize environmental impacts. This work compared the efficacy of a new ecological polymer-coated urea fertilizer and a slow release urea-based traditional fertilizer. Reductions in the N doses of the polymer-coated fertilizer were tested. A comparative study was first carried out by measuring the different physiological and yield parameters at the micro-scale level, and later-on field experiments were performed. Grain yield in the field was significantly higher (20%) when applying the new controlled-release fertilizer than when using the traditional one at the same dose. A 20% reduction in N content in the new fertilizer gave similar physiological and yield responses compared to the traditional fertilizer. We conclude that this new fertilizer can be used in extensive cropping of maize, guaranteeing at least the same yields than traditional fertilizers, with a reduction on the impact on soil properties and nitrogen losses.

Automated summary

This study compared the efficacy of a new ecological polymer-coated urea fertilizer with a traditional slow-release urea-based fertilizer, finding that the new controlled-release fertilizer significantly increased grain yield in the field compared to the traditional one at the same dose. A reduction in nitrogen content in the new fertilizer also showed similar physiological and yield responses as the traditional fertilizer. This new fertilizer can be used in extensive maize cropping, guaranteeing similar yields while reducing soil properties and nitrogen losses.