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• W3045896194 abstract "Abstract Inappropriate nitrogen (N) fertilization rate could cause yield and economic losses and negative environmental impacts. This study was conducted to explore optimum N rate for a promising biofuel crop ‐ bioenergy sorghum [ Sorghum bicolor (L.) Moench]. The biogeochemical model, DAYCENT, was verified with an eight‐year field trial and then used to simulate the long‐term (35 years) effects of N fertilization on aboveground biomass carbon (C), soil organic C (SOC), carbon dioxide (CO 2 ), and nitrous oxide (N 2 O) emissions. Associated with the simulated metrics, N use efficiency (NUE), net greenhouse gas (GHG) emissions, and net economic return to N (RTN) were calculated to determine the optimum N rate. The model was capable of reproducing the field measurements with r 2 of 0.57, 0.47, 0.55, and 0.34 for aboveground biomass C, SOC, CO 2 , and N 2 O, respectively. Projection with 0–350 kg N ha −1 fertilization in increments of 70 kg N ha −1 indicated positive responses of aboveground biomass C and SOC to increasing N but with little increase above 140 kg N ha −1 . Declining NUE and increasing net GHG emission at field scale were predicted as N rate increased. When considering GHG mitigation from fossil fuel replacement, net GHG emission decreased first and leveled off at a N rate of 70–140 kg N ha −1 before increasing. Net economic RTN increased first and peaked when N rate was around 140 kg N ha −1 before decreasing. Fertilization at 140 kg N ha −1 was found to be optimal when using both GHG mitigation and economic criteria." @default.
• W3045896194 created "2020-08-03" @default.
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• W3045896194 date "2020-09-21" @default.
• W3045896194 modified "2023-10-05" @default.
• W3045896194 title "Simulating impacts of nitrogen fertilization using DAYCENT to optimize economic returns and environmental services from bioenergy sorghum production" @default.
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• W3045896194 doi "https://doi.org/10.1002/agj2.20390" @default.
• W3045896194 hasPublicationYear "2020" @default.
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