Nitrogen balance in the system plant - soil after urea fertilization combined with urease inhibitors

The distribution of 15 N labelled urea in the system plant - soil under the influence of two urease inhibitors (samples of the group of phosphoric acid triamides) was investigated in a pot trial with oat. The yield and N-utilization of oat were increased by both inhibitors and the losses of fertilizer-N out of the system where reduced.