Preparation and characterization of slow-release fertilizer encapsulated by biochar-based waterborne copolymers

Chen, Songling; Han, Yachun; Ba, Chuang; Yu, Shuai; Jiang, Yifei; Zou, Hongtao; Zhang, Yulong

doi:10.1016/j.scitotenv.2017.09.209

Cited by 153 publications

(72 citation statements)

References 26 publications

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“…However, when biochar and soil have similar cation exchange properties, then addition of biochar may have little or no effect on retaining ammonium ions. In general, biochar increases the cation exchange capacity of the soil (Chen et al, 2018). The strong adsorption of ammonium by the negatively charged biochar particles during mineralization can reduce formation of nitrates and thus nitrate leaching.…”

Section: Nitrate and Ammonium Leachingmentioning

confidence: 99%

“…Indeed, some researchers have used biochar as fertilizer coating material to slow the release of fertilizers, matching the crop needs for nutrients and reducing losses of excess nutrients through erosion or leaching (Hagemann et al, 2017). For example, Chen et al (2018) reported that rice biochar-based polymers used to coat fertilizer granules in slow-release fertilizer can increase the effectiveness of fertilizer use.…”

Section: Nitrate and Ammonium Leachingmentioning

confidence: 99%

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Biochar and Water Quality

Blanco‐Canqui¹

2019

J of Env Quality

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Biochar application is considered to be an emerging strategy to improve soil ecosystem services. However, implications of such application on water quality parameters have not been widely discussed. This paper synthesizes the state‐of‐the‐art research on biochar effects on water erosion, nitrate leaching, and other sources of water pollution. Literature indicates that in general, biochar application reduces runoff by 5 to 50% and soil loss by 11 to 78%, suggesting that it can be effective at reducing water erosion, but the magnitude of erosion reduction is highly variable. Co‐application of biochar with other organic amendments (i.e., animal manure, compost) appears to be more effective at reducing water erosion than biochar alone. A main mechanism by which biochar can reduce water erosion is by improving soil properties (i.e., organic C, hydraulic conductivity, aggregate stability), which affect soil erodibility. This review also indicates that biochar reduces nitrate leaching, in most cases by 2 to 88%, but has mixed effect on phosphate and dissolved C leaching. Additionally, biochar effectively filters urban runoff, adsorbs pollutants, and reduces pesticides losses. Biochar feedstock, pyrolysis temperature, application amount, time after application, and co‐application with other amendments affect biochar impacts on water quality. Biochar erosion and potential reduction in nutrient and pesticide use efficiency due to the strong adsorption are concerns that deserve consideration. Overall, biochar application has the potential to reduce water erosion, nitrate leaching, pesticide losses, and other pollutant losses, but more field‐scale data are needed to better discern the extent to which biochar can improve water quality. Core Ideas Biochar can reduce water erosion, but the magnitude of reduction is variable. Biochar combined with other organic amendments can reduce water erosion more than biochar alone. Biochar can reduce nitrate leaching but has mixed effects on phosphate and dissolved C leaching. Biochar filters urban runoff, adsorbs organic pollutants, and reduces pesticide losses. More field data on the effectiveness of biochar for improving water quality are needed.

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Section: Nitrate and Ammonium Leachingmentioning

confidence: 99%

Section: Nitrate and Ammonium Leachingmentioning

confidence: 99%

Biochar and Water Quality

Blanco‐Canqui¹

2019

J of Env Quality

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“…3 Therefore, these reports evidence the need to prospect fertilizer technologies which release K in a controlled process according to plant demands aiming to improve fertilizer efficiency, including the reduction of both on K loss and the need of split application. 4,5 In fact, several studies have been performed into using different materials as slow-release K-fertilizer, such as rice husk ash for the synthesis of silicon and potassium, 6 K-feldspar (KAlSi 3 O 8 ) 7 and chrysotile/K 2 HPO 4 . 8 Serpentinite, a metamorphic rock with general approximate formula [Mg 3 Si 2 O 5 (OH) 4 ], is found in different places on the surface of the world with global reserves estimated in hundreds of millions kg.…”

Section: Introductionmentioning

confidence: 99%

Potential Slow Release Fertilizers Based on K2MgSiO4 Obtained from Serpentinite

Ballotin

Santos

Mattiello

et al. 2020

J. Braz. Chem. Soc.

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In this work, a potassium magnesium silicate mineral based on phase K 2 MgSiO 4 was prepared from serpentinite rock and studied as a potential K and Mg slow-release fertilizer. The material was prepared by impregnation of serpentinite/KOH and calcination at 700 °C to produce K 2 MgSiO 4 phase, olivine and forsterite. The release patterns of K and Mg in the stirred-flow trial and leaching through the soil columns showed that K 2 MgSiO 4-based materials released K on lower rates than KCl and MgSO 4 .7H 2 O, however, there was no evidence of Mg release. The extraction with 1 mol L-1 NH 4 OAc showed a considerable content of Mg and K for K 2 MgSiO 4-based materials, due to exchange of NH 4 + and Mg 2+. X-ray diffraction (XRD) analysis of materials impregnated with K and calcined showed peaks relative to K 2 MgSiO 4. After leaching, the peaks intensity diminished, supporting that part of K leached. Therefore, the samples showed great potential as slow-release K-fertilizers when compared with KCl source.

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“…Despite the environmental problems, conventional NPK fertilizers are still preferred fertilizers in agriculture as nutrients resources to the crops . But due to unreliable water flowing, the NPK fertilizers tend to fast release their nutrients to the soil environment . The excessive usage of NPK fertilizers would damage crop growth and also cause soil pollution due to leaching.…”

Section: Introductionmentioning

confidence: 99%

Carbonaceous microsphere‐based superabsorbent polymer as filler for coating of NPK fertilizer: Fabrication, properties, swelling, and nitrogen release characteristics

Khan

Zakaria

Kim

et al. 2019

J of Applied Polymer Sci

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Recently, the use of controlled release fertilizers in agriculture has resulted in huge benefits in plant growth and cultivation. Superabsorbent polymer (SAP)‐coated fertilizers have the added advantage in retaining water in soil after irrigation and also reduce the nutrient release rate from soil in a controlled manner. This study aimed to produce a nitrogen–phosphorus–potassium (NPK) fertilizer coated with superabsorbent carbonaceous microspheres polymer (SPC) by inverse suspension polymerization method with water‐retention and controlled release properties. Two sets of experiments were conducted: (1) three different weight percentages and (2) different materials. NPK coated with SPC showed increasing water‐retention ability with respect to carbon microsphere percentages and retains >80% water at the 30th day of experiment compared with pure NPK and NPK coated with SAP. The slow release behavior of all samples was investigated by induced coupled plasma mass spectrometry spectrometry and results showed that NPK coated with SAP and SPC has a low release rate with <50% nutrient release compared with uncoated NPK at the 30th day. The release mechanism kinetics of NPK coated with SAP and SPC were studied based on the Kosmeyer–Peppas model. The mechanisms approached Fickian diffusion‐controlled release as the n value for both samples was less than 0.5. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2020, 137, 48396.

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Preparation and characterization of slow-release fertilizer encapsulated by biochar-based waterborne copolymers

Cited by 153 publications

References 26 publications

Biochar and Water Quality

Biochar and Water Quality

Potential Slow Release Fertilizers Based on K2MgSiO4 Obtained from Serpentinite

Carbonaceous microsphere‐based superabsorbent polymer as filler for coating of NPK fertilizer: Fabrication, properties, swelling, and nitrogen release characteristics

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