Effects of biochar addition and deficit irrigation with brackish water on yield-scaled N2O emissions under drip irrigation with mulching

• DOI: 10.1016/j.agwat.2022.108129
• Publication Date: 2023-01-02T16:35:23Z
• Authors: Yang Chen; Lu Wang; Ling Tong; Xinmei Hao; Xuanyi Wu; Risheng Ding; Shaozhong Kang; Sien Li
• Keywords: Water Use Efficiency

Biochar has been proven to have great potential for mitigating greenhouse gas emissions and improving crop growth. However, the effects of biochar addition on yield-scaled N2O in a mulched drip-irrigated maize field using different irrigation water qualities quantities remain unclear. A two-year experiment was conducted examine addition, level salinity soil emissions, yield grain N uptake Northwest China. Eight treatments total included combination two rates 0 t/ha (B0) 60 (B1), levels full (W1) deficit (W2, W2 = 1/2 W1) freshwater (S0, 0.71 g/L) brackish (S1, 4 g/L). The properties, emission fluxes, uptake, along with abundances N-cycle functional marker genes were measured during growing seasons. Soil water-filled pore space (WFPS), NH4+-N NO3--N contents accounted majority variation dynamic changes fluxes. Deficit had lower compared irrigation, which more pronounced second year. Relative increased under W1, but similar both years. effectively mitigated by 29.4–31.0% 17.9–29.2% 2020 2021, respectively. continuous drought induced weakened effectiveness reducing emissions. differences could not reflect cumulative among treatments. Under all excluding W2S1, improved over period 4.06–10.74% 5.57–8.63%, Brackish whereas reduced them. Overall, these findings suggest that can reduce increase drip mulching system, thus adding help achieving sustainability agricultural production areas limited resources.