02423naa a2200361 a 450000100080000000500110000800800410001902200140006002400550007410000160012924501060014526000090025150001020026052012930036265000120165565000120166765000240167965000190170365000120172265000170173465000160175165300290176765300250179665300110182165300270183270000250185970000190188470000200190370000200192370000210194370000220196477300750198621150422022-06-10       2020    bl uuuu     u00u1 u    #d  a0365-03407 ahttps://doi.org/10.1080/03650340.2019.16509162DOI1 aPUGA, A. P.  aNitrogen availability and ammonia volatilization in biochar-based fertilizers.h[electronic resource]  c2020  aArquivo com texto completo contém a versão publicada online, sem dados de volume e paginação.  aAbstract: Increasing N use efficiency is an important strategy to intensify sustainable agriculture, optimize nutrient use, and reduce N loss to the environment via different routes. Owing to its physicochemical properties, biochar can be used as an additive to produce biochar-based fertilizers (BFs) with increased efficiency. We investigated N availability and ammonia loss from 17 BFs (3%?38% N). N availability and release from BFs were evaluated by water extraction experiments and soil column leaching. BFs (5%?10% N) had an average of 64% solubilized N after five extractions, whereas urea had 98% solubilized N. However, BFs produced with urea released N more slowly in soil, with the release rate 60% less than that of urea. Ammonia volatilization was evaluated using a 22-d experiment, where N was applied to soil surface (pH = 4.4). We compared urea, BF granulated with urea, and BF produced by coating urea granules with acidified or unacidified biochar. Compared to urea, biochar-based fertilizers granulated with urea and urea granules coated with acidified biochar significantly reduced (t-test at 5%) ammonia volatilization by 14%. The results demonstrated the potential of BFs as enhanced efficiency fertilizers. Therefore, BFs might be a good option to mitigate N loss.  aAmmonia  aBiochar  aMineral fertilizers  aVolatilization  aAmônia  aFertilizante  aNitrogênio  aBiochar-based fertilizer  aIncrease defficiency  aN loss  aSlowrelease fertilizer1 aQUEIROZ, M. C. de A.1 aLIGO, M. A. V.1 aCARVALHO, C. S.1 aPIRES, A. M. M.1 aSANTOS, J. de O.1 aANDRADE, C. A. de  tArchives of Agronomy and Soil Sciencegv. 66, n. 7, p. 992-1004, 2020.