Biochar phosphorus fertilizer effects on soil phosphorus availability

Li, Haixiao; Li, Yuxin; Xu, Yan; Lu, Xueqiang

doi:10.1016/j.chemosphere.2019.125471

Cited by 121 publications

(56 citation statements)

References 28 publications

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“…They also found that available P (i.e., Olsen-P) in biochar increased from 280 to 676 mg kg −1 when the pyrolytic temperature increased from 300 °C to 600 °C. Li et al (2020) found that Olsen-P increased in both pristine and P-laden biochar by 43 and 15%, respectively, when the pyrolytic temperature increased from 350 °C to 600 °C. The authors also observed that the amount of Olsen-P increased in KH 2 PO 4 -treated biochar with increase in temperature.…”

Section: Phosphorusmentioning

confidence: 94%

Biochar and its importance on nutrient dynamics in soil and plant

Hossain

Bahar

Sarkar

et al. 2020

Biochar

379

125

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Biochar, an environmentally friendly soil conditioner, is produced using several thermochemical processes. It has unique characteristics like high surface area, porosity, and surface charges. This paper reviews the fertilizer value of biochar, and its effects on soil properties, and nutrient use efficiency of crops. Biochar serves as an important source of plant nutrients, especially nitrogen in biochar produced from manures and wastes at low temperature (≤ 400 °C). The phosphorus, potassium, and other nutrient contents are higher in manure/waste biochars than those in crop residues and woody biochars. The nutrient contents and pH of biochar are positively correlated with pyrolysis temperature, except for nitrogen content. Biochar improves the nutrient retention capacity of soil, which depends on porosity and surface charge of biochar. Biochar increases nitrogen retention in soil by reducing leaching and gaseous loss, and also increases phosphorus availability by decreasing the leaching process in soil. However, for potassium and other nutrients, biochar shows inconsistent (positive and negative) impacts on soil. After addition of biochar, porosity, aggregate stability, and amount of water held in soil increase and bulk density decreases. Mostly, biochar increases soil pH and, thus, influences nutrient availability for plants. Biochar also alters soil biological properties by increasing microbial populations, enzyme activity, soil respiration, and microbial biomass. Finally, nutrient use efficiency and nutrient uptake improve with the application of biochar to soil. Thus, biochar can be a potential nutrient reservoir for plants and a good amendment to improve soil properties.

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Section: Phosphorusmentioning

confidence: 94%

Biochar and its importance on nutrient dynamics in soil and plant

Hossain

Bahar

Sarkar

et al. 2020

Biochar

379

125

View full text Add to dashboard Cite

show abstract

“…This effect, as well as the effects of crop P-use efficiency, has been described in many studies [17,18]. Other studies have suggested that these effects can be mediated by the high adsorption capacity of biochar [15,28].…”

Section: Discussionmentioning

confidence: 72%

“…Moving to conventional conditions of biochar amendments in soil, the Pi reactivity with biochar has been previously cited [15][16][17][18][19][20], but as shown by the isotherm experiments, some other elements could be involved in this biochar reactivity in soil. This fact might explain the disparity between the results reported by different studies.…”

Section: Discussionmentioning

confidence: 96%

“…Thus, in acidic soils, Pi is adsorbed in Al/Fe oxides, and in alkaline soils, Pi is precipitated through Ca bond. Different authors have described the effects of biochar on P bioavailability [15,16], the soil P fraction related to P plant availability [17], the efficiency of P use by plants [18], mycorrhizal colonization [19], and indeed, changes in phosphate crystalline structures [20]. Moreover, this effect could be increased by a large number of carboxylic groups and high surface adsorption area that different biochars normally show.…”

Section: Introductionmentioning

confidence: 99%

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Biochar-Ca and Biochar-Al/-Fe-Mediated Phosphate Exchange Capacity are Main Drivers of the Different Biochar Effects on Plants in Acidic and Alkaline Soils

et al. 2020

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Because of the low consistency of the results obtained in the field, the use of biochar as a soil amendment is controversial. Thus, in general, in acidic soils, results are positive, while in alkaline soils, they are non-significant or even negative. The results regarding biochar action in acidic soils have been related to a lime-like effect due to its alkaline pH and the high doses normally used. However, the causes of biochar effects in alkaline soils remain unknown. Our objective was to explore the chemical mechanism of biochar interaction in acidic and alkaline soils. We used well-characterized biochar as a component of two complex N and PK granulated fertilizers at two different doses (1% and 5%). These fertilizers were applied to wheat cultivated in pots containing an alkaline soil and grown for 60 days. No effect was shown for the N-biochar fertilizer application. However, the PK-biochar fertilizer application caused a decrease in crop yield. In addition, the adsorption isotherms of Al, Fe, Mo, Mn, and Phosphate (Pi) in biochar were also studied. The results showed that Fe and Al were rapidly adsorbed in biochar, while Pi was only adsorbed on the Fe-, Al-biochar complex. Desorption experiments showed that P and Fe/Al were not desorbed from the P-Fe/Al-biochar complex by water or the Olsen reagent, while partial desorption was observed when HCl 0.1 M was used. This blockage of Fe/Al and P through Fe/Al bridges in biochar could partially explain the negative effects in alkaline soils. After these studies, soil solution sorption experiments were carried out in both acidic and alkaline soils and were complemented with a greenhouse trial using tomato plants. The results showed that biochar enhanced foliar Ca and N content, as well as growth in acidic soil only, and the possible mechanism of the failure in alkaline soils.

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“…pharmaceuticals and complex chemicals), which cannot be handled by conventional systems (Benstoem et al, 2018;Freihardt et al, 2017). The increase in the number of reports on the positive effect of applying carbonaceous materials in agriculture with respect to crop production and soil health gains increasing interest (Li et al, 2020). This opens up possibilities for use of ACs or biochar produced from bio-resources in agriculture, as a sustainable fertilizer and soil enhancer.…”

Section: Introductionmentioning

confidence: 99%