02853naa a2200349 a 450000100080000000500110000800800410001902200140006002400570007410000160013124501400014726000090028752018500029665000120214665000120215865000210217065000120219165000180220365000120222165000170223365000160225065300150226665300170228165300250229865300110232365300170233470000200235170000200237170000220239170000220241377300680243521157722021-04-12       2019    bl uuuu     u00u1 u    #d  a0048-96977 ahttps://doi.org/10.1016/j.scitotenv.2019.1353752DOI1 aPUGA, A. P.  aBiochar-based nitrogen fertilizersbgreenhouse gas emissions, use efficiency, and maize yield in tropical soils.h[electronic resource]  c2019  aAbstract: The sustainable development of agriculture depends on increasing N use efficiency (NUE) and volatilization, NO3 - leaching, and N2O emissions. While the chemical and physical properties of biochar (BC) in fertilizers have been evaluated to increase NUE, a lack of information exists regarding the effects of BC amendments in tropical soils. We performed a one-year field experiment with tropical soil to evaluate the effects of BCbased N fertilizers (BN) on maize yield and on greenhouse gas (GHG) emissions. The treatments consisted of five fertilizers: ammonium nitrate (AN), urea (U), BN51/10 (51% BC, 10% N), BN40/17 (40% BC, 17% N), BN29/20 (29% BC, 20% N), and a control (without N fertilizer). The N fertilizers (80 kg N ha-1) were broadcast 20 days after sowing. Yield, grain N uptake, NUE, ammonia volatilization, and GHG emissions were measured. The results demonstrated the potential of BNs to enhance the efficiency of the fertilizers. BN51/10 and BN40/17 had an average maize yield that was 26% higher than that of U, and BN51/10 resulted in a NUE that was 12% higher than what was observed for U. Both the effects on yield and NUE were attributed to lower N release rates of the BN-amended fertilizers compared to that of the conventional soluble N sources. The BC-based fertilizers presented better environmental performance, and BN51/10 showed the lowest emission intensity when C sequestration by BC was not considered, with a value that was 14% lower than that of the U treatment. When considering C sequestration by BC, the emission intensity of the C equivalents demonstrated that all BNs presented C sequestration that differed from that of the mineral N sources. BC-based nitrogen fertilizers may have promising applications for sustainable agricultural development by mitigating N losses and increasing C stocks.  aAmmonia  aBiochar  aGreenhouse gases  aMethane  aNitrous oxide  aAmônia  aFertilizante  aNitrogênio  aBiocarvão  aCH4 emission  aIncreased efficiency  aN loss  aN2O emission1 aGRUTZMACHER, P.1 aCERRI, C. E. P.1 aRIBEIRINHO, V. S.1 aANDRADE, C. A. de  tScience of The Total Environmentgv. 704, article 135375, 2019.