Acidification and alkalinization pretreatments of biowastes and their effect on P solubility and dynamics when placed in soil

Sica, Pietro; Kopp, Clara; Müller-Stöver, Dorette Sophie; Magid, Jakob

doi:10.1016/j.jenvman.2023.117447

Cited by 15 publications

(6 citation statements)

References 61 publications

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“…This increase may have been caused by adding C org to C-limited microorganisms in the soil (Traoré et al, 2016;Zheng et al, 2020). Although some authors point out that the fertilizer-soil interface can immobilize N (Moritsuka et al, 2004) and P (Sica et al, 2023) in organic forms, this has not been observed in this study.…”

Section: Organic Matter Effect On Nutrient Organic Immobilization (Hy...contrasting

confidence: 58%

“…These were the nutrient application rates: 150 mg K, 50 mg Ca, 40 mg Mg, 1.2 mg Zn, 0.1 mg Mo, 3 mg Fe, 0.3 mg B, 2 mg Mn, 1.5 mg Cu, and 0.1 mg Co per kg −1 soil to avoid any possible complementary nutrient deficiency. The application rates for macro and micronutrients were determined based on preliminary studies conducted with the soil used in this study, and based on Sica et al (2023). Nitrogen and phosphorus were only provided by the fertilization treatments used in this study.…”

Section: Soilmentioning

confidence: 99%

“…On the other hand, in the case of P, it was observed that the GC, MSWC, and VC OMFs had higher residual P fractions in soil compared to the mineral control and the Peat OMF (Table 2). In the simplified Hedley extraction method, the residual P also accounts for organic P fractions in the soil (Alvarenga et al, 2017;Sica et al, 2023). Differences between the OMFs on the increase of residual P can be linked to the stability of the organic material and its resistance to microbial breakdown (Bernal et al, 1998;Grigatti et al, 2020).…”

Section: Organic Matter Effect On Nutrient Organic Immobilization (Hy...mentioning

confidence: 99%

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Testing biowaste materials as peat replacement in organo-mineral fertilizers

Sitzmann,

Sica,

Grignani

et al. 2024

Front. Sustain. Food Syst.

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Organo-mineral fertilizers (OMFs) can have higher efficiency than mineral fertilizers. In Europe, peat is commonly used as an organic matrix in OMFs, as it is a highly stable organic material. However, peat extraction releases long-term stored organic C. Stabilized biowaste materials could replace peat in OMFs. Thus, this study aimed to understand how the variety of chemical properties in biowastes can influence OMF-soil interactions and nutrient availability to plants. Peat, green compost (GC), municipal solid waste compost (MSWC), and vermicompost (VC) were used as the organic matrix of OMFs with a C-N-P2O5 content of 7.5, 10, and 5%, respectively. OMFs were tested first in a ten-day plant-free incubation to measure Hedley P fractionation, nitrate, ammonium, total N in the soil, and CO2 and NH3 emissions. Further, a 30-day greenhouse trial measured maize yield and N and P use efficiencies. Controls included no fertilization (N0P0) and mineral N and P fertilization (MFNP). No differences were found in the incubation experiment for mineral N fractions in the soil. Fertilization significantly increased CO2 emissions, which were slightly higher in OMFs over MFNP, whereas OMFs significantly increased ammonia volatilization compared to MFNP. Available P had consistent results in the incubation and the greenhouse trials. Peat and MFNP had the highest water-and bicarbonate-P pools in the first experiment and higher yield and P use efficiency by maize. Therefore, OMFs from biowaste materials exhibited limited suitability for short growth cycles due to lower P use efficiency and higher ammonia volatilization.

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Section: Organic Matter Effect On Nutrient Organic Immobilization (Hy...contrasting

confidence: 58%

Section: Soilmentioning

confidence: 99%

Section: Organic Matter Effect On Nutrient Organic Immobilization (Hy...mentioning

confidence: 99%

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Testing biowaste materials as peat replacement in organo-mineral fertilizers

Sitzmann,

Sica,

Grignani

et al. 2024

Front. Sustain. Food Syst.

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“…Considering the low mass of VC added to the soil, the immobilization observed in OMF 15C could have been caused by a localized effect of the mimicked combined fertilizer (fertilizer hotspot). Organic materials increase the microbial activity at the fertilizer–soil interface that could immobilize available N (Moritsuka et al., 2004) and P (Sica et al., 2023). The hypothesis of VC reducing nutrient availability, with a rate effect (15C org > 7.5C org ), could be inferred from the results of the incubation study.…”

Section: Discussionmentioning

confidence: 99%

“…The incubation set‐up and soil sampling was adapted from Sica et al. (2023), and consisted of using plastic cylinders of 18 mm of height and 60 mm of diameter. Each experimental unit had two cylinders placed one above the another and was filled with 148.6 g of soil in total (Figure 1).…”

Section: Methodsmentioning

confidence: 99%

An isotope study on nitrogen and phosphorus use efficiency and movement in soil in a mimicked vermicompost‐based organo‐mineral fertilizer

Sitzmann,

Sica,

Zavattaro

et al. 2024

Agrosystems Geosci & Env

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Vermicompost (VC), a stabilized organic material with high organic and humic carbon, and favorable aggregation properties, was tested as a fraction of organo‐mineral fertilizers (OMFs), where organic and mineral fractions interact in hotspot areas with surrounding soil. Solutions containing 33P radioisotope and 15N‐labeled mineral fertilizers were combined with VC at two ratios of organic carbon (Corg) to mineral nitrogen (N) and phosphorus (P) (OMF7.5C and OMF15C) to simulate OMF granules. Control treatments included unfertilized soil (N0P0), mineral fertilizer (MFNP), and sole VC at two rates (OF7.5C and OF15C). Nitrogen and P uptake by Italian ryegrass (Lolium multiflorum) were measured over in 8 weeks. Furthermore, MFNP, OMF7.5C, and OMF15C treatments were incubated for 10 days without plant to measure atom% 15N excess and 33P radioactivity, as indicators of N and P movement from two soil layers (surrounding fertilizer hotspot and below it). In the pot study, OMF15C caused 24% lower biomass and less nutrient recovery derived from fertilizer (N, 11% and P, 8.5%), compared to MFNP. In the incubation study, OMF15C exhibited +19% atom% 15N excess in the combined two soil layers, relative to MFNP, and +28% 33P radioactivity in the soil surrounding the hotspot, and −89% in the soil below it. We interpreted this as a reduction in nutrient availability of the combined VC + mineral fertilizers, due to lower P mobility in soil. The combination of VC with mineral fertilizers can reduce P movement in soil. A higher Corg:N:P ratio resulted in lower nutrient use efficiency in 2 months.

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Enhancing phosphorus availability in biochar: Comparing sulfuric acid treatment to biological acidification approaches

Kopp,

Regueiro,

Stoumann‐Jensen

et al. 2024

J. Plant Nutr. Soil Sci.

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BackgroundThe use of sulfuric acid (SA) to acidify biochars is known to enhance their phosphorus (P) fertilizer value. Potentially, biological approaches such as lowering the pH of biochar by lactic acid co‐fermentation or applying biochar with a nitrification inhibitor (NI) to reduce rhizosphere pH are an alternative to SA.AimThis study aimed to evaluate the two methods for increasing plant P availability from two biochars and compare them with SA‐treated biochars (as a reference) in a pot experiment.MethodsMeat and bone meal biochar (MB‐C) and digestate solids biochar (DS‐C) were bio‐acidified (BA) by lactic acid fermentation with organic waste. The untreated, SA‐treated, BA biochars, and biochars co‐applied with a NI (3,4‐dimethylpyrazolephosphate) were tested in a pot experiment with maize.ResultsThe fermentation reduced the pH of the organic waste biochar mixtures to <4.3 and increased water‐extractable P (WEP) to 30% of total P. The untreated biochars had a mineral fertilizer replacement value of >50% and SA increased replacement values to ≈100%. The application of NI did not affect rhizosphere pH or P uptake. The BA MB‐C increased soil solution P concentration, but P uptake did not significantly increase. The application of the BA DS‐C raised soil pH and reduced plant P uptake and biomass.ConclusionThe untreated biochars showed considerable P fertilizer effectiveness, suggesting that acidification may not always be necessary. Rhizosphere acidification and the bio‐acidification of biochars were not effective in further increasing P uptake, despite higher levels of WEP.

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Acidification and alkalinization pretreatments of biowastes and their effect on P solubility and dynamics when placed in soil

Cited by 15 publications

References 61 publications

Testing biowaste materials as peat replacement in organo-mineral fertilizers

Testing biowaste materials as peat replacement in organo-mineral fertilizers

An isotope study on nitrogen and phosphorus use efficiency and movement in soil in a mimicked vermicompost‐based organo‐mineral fertilizer

Enhancing phosphorus availability in biochar: Comparing sulfuric acid treatment to biological acidification approaches

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