Nitrate Absorption and Desorption by Biochar

He, Zijian; Wang, Chao; Cao, Hongxia; Liang, Jiaping; Pei, Shuyao; Li, Zhijun

doi:10.3390/agronomy13092440

Cited by 7 publications

(2 citation statements)

References 109 publications

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“…In order to optimize the use of adsorbents, previous studies have suggested modeling interactions between biochar and N during the adsorption process (He et al, 2023) Langmuir equation:…”

Section: Data Analysis and Statisticsmentioning

confidence: 99%

Reduction of nitrogen loss in runoff from sloping farmland by a ridged biochar permeable reactive barrier with vegetated filter strips

Zhang,

Gao,

et al. 2024

Front. Environ. Sci.

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IntroductionEutrophication due to nitrogen (N) loss from sloping farmland has a high risk in the Three Gorges Reservoir. Biochar and vegetated filter strips (VFS) are used to control nutrient runoff and increase soil water-holding capacity, soil nutrient retention, and crop yield. However, surface biochar application has limited ability to control N loss, especially from sloping farmland.MethodsIn this study, different widths of ridged biochar permeable reactive barrier (RB-PRB) with VFS were employed to intercept N loss in runoff from sloping farmland. Adsorption characteristics of biochar for nitrate and ammonium N were evaluated using isothermal and kinetic adsorption models before field experiments. N index values for ammonium (NH4+), nitrate (NO3−), dissolved N (DTN), particulate N (PN), and total N (TN) lost through runoff were monitored from April 2019 to January 2020.ResultsNO3− and NH4+ sorption on biochar was predominantly physical adsorption with a maximum capacity of 4.51 and 4.12 mg g-1, respectively. During the research period, the dominant transportation pathway of N loss involved dissolved total N movement through subsurface flow, which accounted for 65.55% of the total loss. TN loss for CK was 1954 g·hm-2, while RB-PRB and VFS decreased N loss from sloping farmland by 36.7%. The interception efficiency of RB-PRB was highest at 0.3 m width. VFS successfully intercepted particulate N and reduced it by 32.75%. In terms of soil nutrients, the RB-PRB and VFS interventions led to a substantial 41.69% increase in the TN content of the soil at a 0.4 m width.DiscussionThe findings suggest that biochar has a favorable adsorption effect on NH4+ and NO3−, an appropriate width of RB-PRB with VFS could effectively reduce nitrogen loss from sloping farmland. Simultaneously, it enhances the water and fertilizer retention capacity of sloping cropland soil; however, the long-term implications necessitate further validation.

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“…In order to optimize the use of adsorbents, previous studies have suggested modeling interactions between biochar and N during the adsorption process (He et al, 2023) Langmuir equation:…”

Section: Data Analysis and Statisticsmentioning

confidence: 99%

Reduction of nitrogen loss in runoff from sloping farmland by a ridged biochar permeable reactive barrier with vegetated filter strips

Zhang,

Gao,

et al. 2024

Front. Environ. Sci.

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“…The physical adsorption of nitrate N in the pores of biochar cannot be ruled out, and the physical adsorption of nitrate in carbonized matrices could be a mechanism to prevent nitrate losses through leaching in soils treated with biochar [11]. Thus, the adsorption of nitrate in biochars could be a suitable strategy to reduce N losses in the soil-plant system [12]. The use of biochar-N composites increased the nutrient use efficiency by corn in 44% over N from urea [11].…”

Section: Introductionmentioning

confidence: 99%

Biochar–Nitrogen Composites: Synthesis, Properties, and Use as Fertilizer for Maize

Mota,

Silva

2024

AppliedChem

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Nitrogen (N) is highly reactive and prone to being easily lost into the air and soil water. Biochar–N composites have proven effective in nourishing and improving maize growth. The aim of this study was to synthesize and assess the properties of composites made from biochars (pyrolyzed at 300 °C) derived from chicken manure (N = 3.5%) and leguminous cake (N = 9%) and enriched with ammonium sulfate (AS), urea, and diammonium phosphate (DAP). The biochar pH was adjusted to approximately 6 using sulfuric and phosphoric acids prior to formulating the six tested composites. Maize was cultivated for 50 days under greenhouse conditions, with evaluations of the maize dry matter (DM) and N in the plant shoot. The biochar and composite properties underwent scrutiny for chemical and physicochemical attributes, as well as for soluble N in water and in an HCl solution. Throughout maize cultivation, the release of N as ammonium and nitrate from the composites and pure biochars in the Oxisol solution was successively assessed. Composites formulated with DAP and supplied at a dose of 270 mg kg−1 N yielded the same maize dry matter as composites in which 400 mg kg−1 N was supplied to plants. Regardless of the N source, at the end of maize cultivation, the residual N in the Oxisol was reduced and inadequate for a new cultivation, even in soils treated with urea. Notably, the biochar–N composites, particularly those formulated with DAP, were as effective as urea in nourishing and promoting robust maize growth. In contrast, the maize biomass was lower for plants fertilized with pure biochars, indicating that the N from the carbonized matrices was insufficient for optimal biomass production.

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