Effects of fertilizer type on nitrous oxide emission and ammonia volatilization in wheat and maize crops

Abstract

Abstract About half of the applied nitrogen (N) is not consumed by crops, causing environmental and economic costs. This N can be lost as ammonia (NH 3 ) volatilization, nitrous oxide (N 2 O) emission or leaching, among others. This work aimed to compare the amount of gaseous N losses using three different fertilizers on two consecutive experiments: one summer crop (maize) and one winter crop (wheat) in the Rolling Pampa, Argentina. The fertilizers used were urea ammonium nitrate (UAN), calcium ammonium nitrate (CAN) and AN+DMPP (ammonium nitrate‐based NPK fertilizer with DMPP nitrification inhibitor). NH 3 emissions were estimated using a semi open‐static absorption system during the first month after fertilization for each experiment. N 2 O emissions were estimated using vented static chambers during the growing season of each crop. Results show that CAN or AN+DMPP fertilizers used instead of UAN helped to reduce NH 3 volatilization by 45–50% and 62–63% on maize and wheat experiments respectively, but failed to reduce N 2 O emissions. In addition, contrary to the expected, AN+DMPP increased N 2 O emissions during the maize experiment. The majority of the gaseous N losses occurred at specific moments of the crop cycle (after N fertilization and around leaf senescence). Losses as NH 3 volatilization were higher than N 2 O emissions in the maize experiment, as expected because of the warmer temperature during this summer crop. However, N 2 O emissions were higher during the wheat crop, emphasizing the importance of factors such as meteorological conditions, previous land‐use, residual soil nitrate and stubble quality on the soil.