Nitrous oxide (N2O), is a potent greenhouse gas (GHG) that shares 7% of global warming around the world. Among different sources, agricultural systems account for approx. 60% of global anthropogenic N2O emissions. These N2O emissions are associated with the activity of nitrifiers and denitrifiers that contribute to >4 Tg (teragrams) N2O-N emission per year. Application of nitrogen (N) fertilizers and manures in agricultural fields plays an imperative role in this regard. On the other hand nitrification inhibitors are an effective approach to minimize N2O-N emissions from agricultural fields. Here we examined the effects of applying urea with a nitrification inhibitor (Ni) nitrapyrin and mulch (Mu) on urea transformation, nitrous oxide (N2O) emissions, grain yield and nitrogen (N) uptake efficiency. The treatments include a control (zero N), urea (U) applied at 200 kg N ha-1, U + Ni (Ni applied at 700 g ha-1), U+ Mu (Mu applied at 4 t ha-1) and U + Ni + Mu. The N2O emission factor (EF) was 66% and 75% when U and Mu were applied, respectively. Yield-scaled N2O emissions were lower in U and Mu by 45% and 55%, respectively. The Ni coupled with Mu enhanced urea-15N recovery by 58% and wheat grain yield by 23% and total N uptake by 30% compared with U alone. In conclusion, Ni usage is an effective strategy to mitigate N2O emissions under field conditions.

Department of Geology and Pedology Faculty of Forestry and Wood Technology Mendel University in Brno Czech Republic

Department of Horticulture Northeast Agriculture University Harbin China

Department of Soil and Environmental Science the University of Agriculture Peshawar Pakistan

Department of Soil Science Bahauddin Zakariya University Multan 60800 Punjab Pakistan

Hainan Key Laboratory for Sustainable Utilization of Tropical Bioresource College of Tropical Crops Hainan University Haikou Hainan 570228 China; Department of Agronomy The University of Haripur Haripur Khyber Pakhtunkhwa 22620 Pakistan

Citace poskytuje Crossref.org

Influence of variable biochar concentration on yield-scaled nitrous oxide emissions, Wheat yield and nitrogen use efficiency