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• W4308154985 endingPage "116236" @default.
• W4308154985 startingPage "116236" @default.
• W4308154985 abstract "Improving fertilizer-N retention and use efficiency (NUE) is imperative to mitigate the loss of reactive N into the environment. To reach additional improvements in N retention and NUE, we formulated MgO- and sepiolite-biochar nanocomposites with optimized N-retention capacity. The field-scale application of the modified biochars along with 15N-labeled urea (applied at 150 kg ha−1) was used to evaluate growth-stage-related N-partitioning, NUE, and N-recovery in a soil-maize (Zea mays L.) system. The effect of these biochars on growth-stage shifts in soil N-cycling enzymes, bacteria, and gene copies was reported for the first time. Results showed that during the 12-leaf stage, the MgO-biochar (MgOBF), sepiolite-biochar (SBF), and raw biochar (BF) amendments increased 15N-urea retention by 83.7 %, 26.7 %, and 33.0 %, respectively, than the sole fertilizer treatment (F). The improved 15N retention was attributed to the potential formation of an Mg-N complex, increased surface area, and cation exchange capacity (CEC) of the modified biochars particularly, in MgOBF, across maize growth stages compared to the raw biochar and SBF. Moreover, there was a simultaneous increase in the uptake of soil N across the plant growth stages in MgOBF and SBF compared to F and BF. At the physiological maturity (PM) stage, the total 15N uptake by maize was 17.1 % and 10.5 % higher in MgOBF and BF, respectively, compared to F. Moreover, the slow-release of the retained 15N and its increased uptake across maize growth stages increased NUE, biomass, and grain yield in MgOBF compared to other treatments. Hence, a total N recovery (soil + plant) of 90.8 % was recorded in MgOBF compared to 81.7 %, 67.9 %, and 67.8 % in the BF, SBF, and F treatments, respectively. A higher relative abundance of key N-cycling bacteria and their gene copies was associated with an increase in N-cycling enzymes in MgOBF and SBF at the PM stage, hence, promoting the slow-release of the retained N for plants' use. Our findings provide new insights into the applicability of modified biochars, especially, the MgO-modified biochar for improving fertilizer-N retention, NUE, and its recovery in the soil-plant system, while improving soil chemical properties." @default.
• W4308154985 created "2022-11-08" @default.
• W4308154985 creator A5020923760 @default.
• W4308154985 creator A5022652618 @default.
• W4308154985 creator A5040806210 @default.
• W4308154985 creator A5045338115 @default.
• W4308154985 creator A5050577040 @default.
• W4308154985 creator A5058149649 @default.
• W4308154985 creator A5058515402 @default.
• W4308154985 creator A5069437520 @default.
• W4308154985 creator A5080733479 @default.
• W4308154985 date "2023-01-01" @default.
• W4308154985 modified "2023-10-01" @default.
• W4308154985 title "Impacts of MgO- and sepiolite-biochar composites on N-partitioning and dynamics of N-cycling bacteria in a soil-maize system: A field-based 15N-urea tracer study" @default.
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