Biochar application as a soil potassium management strategy: A review

Bilias, Fotis; Kalderis, Dimitrios; Richardson, Clive; Barbayiannis, Nikolaos; Gasparatos, Dionisios

doi:10.1016/j.scitotenv.2022.159782

Cited by 43 publications

(14 citation statements)

References 118 publications

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“…For example, Zhang, Riaz, et al (2020) found that the available K content in peanut shell biochar is as high as 5.14 g kg −1 and can be directly applied as a K fertilizer. Additionally, although the K content is limited in biochar prepared from low-K biomass, biochar was still able to improve soil K availability through the following mechanisms: (1) biochar is usually characterized by abundant surface functional groups and high CEC, which can increase the number of K retention exchange sites and thereby decrease K leaching to the subsurface layer (Bilias et al, 2023. Laghari et al, 2015;…”

Section: Introductionmentioning

confidence: 99%

“…Although the results mentioned above described the possible influence of biochar on soil K, comprehensive studies are still insufficient. A review from Bilias et al (2023) found that only 145 relevant studies based on the keyword "biochar" and "potassium availability" could be retrieved during 2016-2022, while studies on biochar effects on K availability and crop K assimilation are rarely reported and are mainly based on short-term indoor experiments. The long-term role of biochar in driving soil K transformation is still largely unknown (Wang et al, 2018).…”

Section: Introductionmentioning

confidence: 99%

“…(2020) found that the available K content in peanut shell biochar is as high as 5.14 g kg −1 and can be directly applied as a K fertilizer. Additionally, although the K content is limited in biochar prepared from low‐K biomass, biochar was still able to improve soil K availability through the following mechanisms: (1) biochar is usually characterized by abundant surface functional groups and high CEC, which can increase the number of K retention exchange sites and thereby decrease K leaching to the subsurface layer (Bilias et al., 2023. Laghari et al., 2015); (2) biochar soil application is conducive to enhancing soil pH and increasing soil water content, which in turn increases soil K availability (El‐Naggar et al., 2019; Zörb et al., 2014); (3) biochar can promote macroaggregates (Han et al., 2021) and increase aggregate stability, where soil aggregate stability is closely related to soil nutrient storage (Chai et al., 2014), among the soil aggregates size, macroaggregates contribute most to soil K storage (Liu, Han, et al., 2019).…”

Section: Introductionmentioning

confidence: 99%

“…More importantly, even though some laboratory studies concluded that biochar could improve soil K availability, under field conditions, soil K is strongly affected by a variety of factors, such as weather and soil management practices, so most of the results obtained from short‐term laboratory incubation are of limited applicability to field production (Bilias et al., 2023). Therefore, it is of great significance to study the effect of biochar on the transformation and availability of soil K concentration under field conditions, which helps understand the mechanisms regarding how biochar affects soil K and crop K uptake.…”

Section: Introductionmentioning

confidence: 99%

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Long‐term biochar application promoted soil aggregate‐associated potassium availability and maize potassium uptake

Bao,

Dai,

et al. 2024

GCB Bioenergy

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Biochar is an effective ameliorator for soil quality improvement and nutrient reuse from biomass; however, the effect of biochar application on soil potassium (K) availability, plant K uptake, and the underlying mechanisms have not been well‐elucidated. To address this, the variation in the soil K forms, soil aggregate stability, and aggregate‐associated K concentration, as well as maize K uptake, were investigated in a field experiment after 9 years of biochar amendment. The treatments included no biochar and NPK fertilizer (CK); NPK fertilizer treatment (F); biochar applied annually at the rate of 2.625 t ha−1 (C1), and biochar applied annually at rate of 2.625 t ha−1 with NPK fertilizers (C1F); one‐time biochar applied with NPK fertilizers, with biochar rate of 31.5 (C2F) and 47.25 t ha−1 (C3F). The results showed that after 9 years of field application, biochar inhibited the downward K migration to the deeper layer, thus increasing water‐soluble potassium (WSK), exchangeable potassium (EK), non‐exchangeable potassium (NEK), and total potassium (TK) in 0–20 cm soil, with C1F exhibiting better performance than C2F and C3F. Biochar also increased aggregate‐associated EK, NEK, and TK pools, mainly due to an increase in the macroaggregate proportion (>0.25 mm). Biochar amendment promoted maize K uptake by an average of 35.69%, the path analysis indicated that the positive effect was an outcome of the synergetic effect of the increase in surface soil WSK content and promoted macroaggregate EK pools, which was primarily attributed to biochar improved soil properties, including soil organic carbon, pH, total nitrogen, total phosphorus, and cation exchange capacity. These factors explained 76% of the variance in maize K uptake. In conclusion, biochar is an effective ameliorator for improving soil K content and availability.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Long‐term biochar application promoted soil aggregate‐associated potassium availability and maize potassium uptake

Bao,

Dai,

et al. 2024

GCB Bioenergy

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“…It is insoluble, stable, and highly aromatic. Due to its structural characteristics and physical and chemical properties, biochar can improve soil structure, enhance soil water retention and fertilizer and microbial activity, and acts as a good soil modifier [ 10 ]; [ 42 ]; [ 5 , 11 , 12 ]. Prayogo et al.…”

Section: Introductionmentioning

confidence: 99%

Effects of applying peanut shell and its biochar on the microbial activity and community structure of dryland red soil

Zhou¹,

Hong²,

Feng³

et al. 2023

Heliyon

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Soil properties following borrow pit reclamation with insufficient topsoil amended with peat and biochar

Nawu,

Zvomuya,

Adesanya

et al. 2023

Land Degrad Dev

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Disturbed sites, such as borrow pits and oil and natural gas well sites, require reclamation to restore and sustain levels of productivity similar to those prior to the disturbance. However, salvaged topsoil at many sites is often insufficient to meet the 80% topsoil replacement depth (TRD80) required for successful reclamation in western Canada. This 5‐year study evaluated soil responses to 50% topsoil replacement depth without organic amendment (TRD50) or amended with either peat (PTRD50) or biochar (BTRD50), relative to the TRD80 treatment (Control), following borrow pit reclamation at a disturbed boreal site near Cold Lake, Alberta, Canada. Amendments were applied once at rates calculated to raise the soil organic carbon (SOC) content in the TRD50 soil to a level equal to that in the TRD80 treatment. Results showed a 143%, 87%, and 116% increase in total Kjeldahl nitrogen concentration in the PTRD50 relative to the TRD80, TRD50, and BTRD50 treatments, respectively, while soil potassium (K) concentration was significantly greater for BTRD50 than PTRD50. Peat and biochar significantly increased SOC concentrations by 83% and 88%, respectively, relative to the mean of TRD80 and TRD50 treatments. Our results show that peat and biochar can improve soil properties of disturbed boreal sites reclaimed with insufficient salvaged topsoil to a level suitable for successful reclamation. This has important implications on the reclamation of a multitude of disturbed sites, in Canada and globally, that have insufficient volumes of salvaged topsoil needed for successful reclamation.

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Biochar application as a soil potassium management strategy: A review

Cited by 43 publications

References 118 publications

Long‐term biochar application promoted soil aggregate‐associated potassium availability and maize potassium uptake

Long‐term biochar application promoted soil aggregate‐associated potassium availability and maize potassium uptake

Effects of applying peanut shell and its biochar on the microbial activity and community structure of dryland red soil

Soil properties following borrow pit reclamation with insufficient topsoil amended with peat and biochar

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