Stability of co‐composted hydrochar and biochar under field conditions in a temperate soil

Busch, Daniela; Glaser, Bruno

doi:10.1111/sum.12180

Cited by 43 publications

(19 citation statements)

References 36 publications

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“…Increase in soil pH in acidic soils with biochar application had been previously observed (Glaser et al, 2002;Novak et al, 2009;Masulili et al, 2010). However, Van Zwieten et al 2010and Busch & Glaser (2015) did not observe a significant increase in soil pH with biochar application in alkaline soils. Treatment effect was significant (P<0.05) for the EC.…”

Section: Soil Ph Electrical Conductivity Organic Matter and Cation mentioning

confidence: 78%

Beneficial management practices on growth and yield parameters of maize (<em>Zea mays</em>) and soil fertility improvement

et al. 2016

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Beneficial management practices can be used to improve the crop productivity of tropical Alfisols. This study evaluated beneficial management practices to overcome the soil physical and chemical limitations for growing maize (Zea mays). The experiment was conducted in the Low Country Dry Zone (DL1b) on Reddish Brown Earth soil (Typic Rhodustalf). Four treatments; un-amended control (C), site specific fertilizer (SSF), biochar applied at 1 t/ha with SFF (BC+SSF) and rock powder applied at 10 t/ha with SSF (RP+SSF) were tested using maize as the test crop initially in the greenhouse and later in the field at DL1b for two growing seasons (2013 Yala and 2013/2014 Maha) for their effects on crop growth and soil fertility. Soil was neutral, non-saline, sandy clay loam in texture with comparatively high clay content (27%) and low in organic matter content (1.5%) and deficient in N, P, S, Ca, Zn, and Cu, initially. In the greenhouse, plant dry weight increased significantly with the addition of amendments i.e., fertilizers alone (SSF), or BC+SSF or RP+SSF. In the field study, no significant differences were observed for soil pH with the addition of amendments but biochar application significantly increased cation exchange capacity, organic matter, potentially mineralizable nitrogen and carbon management index. Rock powder+SSF and BC+SSF significantly increased the grain yield over the control in both seasons. Both labile and recalcitrant C were significantly higher in BC+SSF treatment than the others. Further, application of BC and RP had no significant impact on soil textural fractions and bulk density, yet in both seasons, BC+SSF application increased the aggregate stability greater than other treatments. The results of the field experiment suggest that biochar and rock powder with adequate nutrients effectively improved soil fertility and productivity.

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Section: Soil Ph Electrical Conductivity Organic Matter and Cation mentioning

confidence: 78%

Beneficial management practices on growth and yield parameters of maize (<em>Zea mays</em>) and soil fertility improvement

et al. 2016

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“…Application of biochar resulted in greater soil pH compared with the control treatment at all times of Busch and Glaser (2015) did not observe a significant increase in soil pH with biochar application, because the pH values of soil and Fig. 4.…”

Section: Soil Ph Changes During Incubation In Unamended and Amended Smentioning

confidence: 85%

Woodchip biochar with or without synthetic fertilizers affects soil properties and available phosphorus in two alkaline, chernozemic soils

et al. 2016

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Fertility enhancement with biochar application is well documented for tropical acidic soils; however, benefits of biochar coapplied with synthetic fertilizers (SFs) on soil fertility are not well documented, particularly for alkaline chernozems. We examined the short-term interactive effects of woodchip biochar amendment with fertilizers on selected soil properties, available phosphorus (P), and P fractions of two alkaline Chernozems from Manitoba. Treatments were (1) urea and monoammonium phosphate fertilizers, (2) biochar at 10 g kg−1, (3) biochar at 20 g kg−1, (4) biochar at 10 g kg−1 with fertilizers, (5) biochar at 20 g kg−1 with fertilizers, and (6) a control. Treated soils were analysed for pH, electrical conductivity (EC), and Olsen P concentration biweekly, and for P fractions, cation exchange capacity (CEC), organic carbon (OC), and wet aggregate stability after 70 d of incubation. Biochar amendment without fertilizers significantly increased soil pH and CEC but had no effect on EC, while coapplication with fertilizers significantly increased Olsen P and labile P concentrations. When coapplied with fertilizers, biochar did not significantly increase soil pH relative to the control. Results suggest that biochar improved soil properties and available P in alkaline Chernozems, and the beneficial effects were enhanced when coapplied with SFs.

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“…Genotoxic and phytotoxic risk assessment showed hydrochars to be phytotoxic, inhibiting germination, although this effect could be eliminated with biological post-treatment [38]. Moreover, hydrochar is less suitable for long-term C sequestration in comparison to biochar, due to a lower stability, but it can deliver essential nutrients, having therefore potential for soil amelioration [39].…”

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confidence: 99%

Towards Biochar and Hydrochar Engineering—Influence of Process Conditions on Surface Physical and Chemical Properties, Thermal Stability, Nutrient Availability, Toxicity and Wettability

et al. 2018

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The impact of conversion process parameters in pyrolysis (maximum temperature, inert gas flow rate) and hydrothermal carbonization (maximum temperature, residence time and post-washing) on biochar and hydrochar properties is investigated. Pine wood (PW) and corn digestate (CD), with low and high inorganic species content respectively, are used as feedstock. CD biochars show lower H/C ratios, thermal recalcitrance and total specific surface area than PW biochars, but higher mesoporosity. CD and PW biochars present higher naphthalene and phenanthrene contents, respectively, which may indicate different reaction pathways. High temperatures (>500 • C) lead to lower PAH (polycyclic aromatic hydrocarbons) content (<12 mg/kg) and higher specific surface area. With increasing process severity the biochars carbon content is also enhanced, as well as the thermal stability. High inert gas flow rates increase the microporosity and wettability of biochars. In hydrochars the high inorganic content favor decarboxylation over dehydration reactions. Hydrochars show mainly mesoporosity, with a higher pore volume but generally lower specific surface area than biochars. Biochars present negligible availability of NO − 3 and NH + 4 , irrespective of the nitrogen content of the feedstock. For hydrochars, a potential increase in availability of NO − 3 , NH + 4 , PO 3− 4 , and K + with respect to the feedstock is possible. The results from this work can be applied to "engineer" appropriate biochars with respect to soil demands and certification requirements.

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Stability of co‐composted hydrochar and biochar under field conditions in a temperate soil

Cited by 43 publications

References 36 publications

Beneficial management practices on growth and yield parameters of maize (<em>Zea mays</em>) and soil fertility improvement

Beneficial management practices on growth and yield parameters of maize (<em>Zea mays</em>) and soil fertility improvement

Woodchip biochar with or without synthetic fertilizers affects soil properties and available phosphorus in two alkaline, chernozemic soils

Towards Biochar and Hydrochar Engineering—Influence of Process Conditions on Surface Physical and Chemical Properties, Thermal Stability, Nutrient Availability, Toxicity and Wettability

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