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• W4306164670 abstract "Optimized fertilization is an effective strategy for improving nitrogen (N) use efficiency and maintaining high crop yield, but its long-term impacts on soil organic carbon (C) and inorganic N dynamics remain unclear. The objectives of this study were to 1) explore the economic optimum N rate and evaluate the DSSAT CERES-Maize model using the measurements from three 3-year maize (Zea mays L.) field experiments, in Gongzhuling and Yushu County, Northeast China, and 2) assess the long-term impacts of farmers' N rate (N250), optimum N rate (N180) and organic-inorganic combined N rate (MN180) on maize yields, soil N and C changes from 1985 to 2020. Results showed that similar maize yields of 8000–11,000 kg ha−1 were achieved under the average economic optimum N rate of 170 kg N ha−1 relative to N250 in both counties. Good agreements were observed between the simulated and measured maize yield, above-ground biomass, N uptake and soil nitrate (NO3−-N). Long-term simulation confirmed that N180 and MN180 can achieve the same yield as N250 in both counties. The lowest annual soil inorganic N balance, NO3−-N leaching, and nitrous oxide (N2O) and ammonia (NH3) emissions were achieved under MN180, followed by N180 in both sites. Higher NO3−-N leaching was found in sandy clay loam soil than silt clay loam and clay loam soils. Average soil organic C (SOC, 0–0.2 m) increased from 1.3 to 2.4% in Gongzhuling and from 2.2 to 2.4% in Yushu under MN180 during the 35-year period, but it showed declining trends under N180 and N250. We concluded that the economic optimum N rate could be an option to replace current farmers’ N rate for the continuous maize. Substitution of inorganic fertilizer by 20–30% manure under the optimum N rate showed advantage on maintaining high yield, reducing soil inorganic N losses as well as increasing SOC stock for sustainable agriculture." @default.
• W4306164670 created "2022-10-14" @default.
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• W4306164670 date "2023-01-01" @default.
• W4306164670 modified "2023-10-02" @default.
• W4306164670 title "Modelling maize yield, soil nitrogen balance and organic carbon changes under long-term fertilization in Northeast China" @default.
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• W4306164670 doi "https://doi.org/10.1016/j.jenvman.2022.116454" @default.
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