Phosphates recycled from semi-liquid manure and digestate are suitable alternative fertilizers for ornamentals

Ehmann, Andrea; Bach, Inga-Mareike; Bilbao, Jennifer; Lewandowski, Iris; Müller, Torsten

doi:10.1016/j.scienta.2018.08.052

Cited by 21 publications

(12 citation statements)

References 33 publications

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“…The high plant availability of struvites has already been widely reported in trials using mineral soils (Kratz et al, 2019;Römer, 2013). Furthermore, our results for two of the struvites, namely STR-GALV and STR-SLURRY, are consistent with Ehmann et al (2019) in similar pot trials with various ornamental plants. However, the P content and P uptake for one of the four struvites, STR-AIRPREX, were significantly reduced.…”

Section: F I G U R Esupporting

confidence: 85%

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Availability of phosphorus recovered from waste streams to plants cultivated in soilless growing media

Hauck

Lohr

Meinken

et al. 2021

J. Plant Nutr. Soil Sci.

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BackgroundUsing secondary phosphorus (P) sources recovered from waste streams for base fertilization of soilless growing media may help conserve the global phosphate resources. However, little is known regarding the plant availability of P from secondary sources for soilless plant production.AimThe objective of this study was to investigate the plant availability of P from secondary sources using a peat‐based growing medium and standard extraction methods.MethodsSeventeen secondary P sources differing in terms of feedstock and processing were tested, and their fertilization efficacy was compared with that of water‐soluble monocalcium phosphate (MCP‐P) in a pot experiment using marigolds. The correlation of plant P uptake with calcium chloride + diethylenetriaminepentaacetate (CAT) and/or calcium–acetate–lactate (CAL) extractable P amount in the growing medium (PCAT and PCAL, respectively) was examined.ResultsOnly three of the 17 tested secondary P sources (all struvite forms) exhibited comparable fertilization efficacy to MCP‐P. The remaining sources showed P uptake varying between 4% and 91% of MCP‐P. For precipitates from liquid waste streams and untreated organic waste, except for sewage sludge and compost, the P uptake ranged from 71% to 100%. The highest variability (4%–86%) was observed for thermally and thermochemically treated secondary P sources. Plant P uptake was closely correlated with PCAT (R2 = 0.76) and PCAL (R2 = 0.78), and this correlation became even stronger when PCAT and PCAL were combined (R2 = 0.89).ConclusionsMost struvite forms meet the requirements of base P fertilization for soilless plant production and can substitute water‐soluble fertilizers obtained from primary P sources. The combination of PCAT and PCAL may be a promising approach to characterize the plant availability of P from secondary sources in soilless growing media and warrants further consideration.

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Section: F I G U R Esupporting

confidence: 85%

“…Thus, the applicability of the current knowledge gained from work in soil-based systems to soilless production remains questionable, and only a few experiments using soilless growing media have been performed (Ehmann et al, 2019;Grunert et al, 2019;Hauck et al, 2021).…”

Section: Introductionmentioning

confidence: 99%

Availability of phosphorus recovered from waste streams to plants cultivated in soilless growing media

Hauck

Lohr

Meinken

et al. 2021

J. Plant Nutr. Soil Sci.

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“…5A). Similar results concerning total P (shoot + flowers) quantity was observed for pot experiment carried out with sunflower and marigold treated with steam-dried solid digestate and TSP as control [15]. In addition, no significant differences were reported in P uptake when plants of amaranth, maize and sorghum were fertilized with two solid digestates and inorganic NPK fertilizer [13].…”

Section: First Growth Cyclesupporting

confidence: 80%

“…The application of agricultural digestate has been tested on the soil with the aim to increase the interaction of the soil-plant systems favoring the growth of the foliar area and weight of the vegetal and the distribution of photo assimilates between the different organs of the plants [10,11]. The liquid and solid fractions of digestates contains macronutrients contain N and P compounds, respectively [12] and it was reported to be an alternative source of inorganic P fertilizers in several plant species such as amaranth and sorghum [13,14], maize [13], plant ornamental species [15], ryegrass [16,17], barley [18] and tomato [12]. But the direct digestate application on the soil has some drawbacks: bad odors, the presence of no stabilized compounds, of pathogens and, in some case, of heavy metals [19].…”

Section: Introductionmentioning

confidence: 99%

Valorisation of Agricultural Digestate for the Ammonium Sulfate Recovery and Soil Improvers Production

Battısta

Masala

Zamboni

et al. 2021

Waste Biomass Valor

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This work investigates an innovative process to valorise agricultural digestate by the exploitation of solar energy. Digestate has been located in a lab-scale greenhouse to evaporate the liquid phase. Digestate vapours, rich in ammonia, are sent in a Drechsler trap, filled with 38% w/w sulfuric acid solution, through three solar air fans. A concentration of about 2 M of ammonium sulphate solution was recovered. The remaining dried solid phase, rich in phosphorous compounds, was evaluated as alternative to the commercial fertilizers (46% P2O5) in the growth of maize plants. Equal amount of P was applied to each pot (25 mg/kg soil). The plants were evaluated along the 8 weeks in a greenhouse monitoring the growth parameters and leaf SPAD index, micro-, macronutrients and non-essential heavy metals. The results evidenced that the dried solid phase of digestate can be used as an alternative source of P. Graphic Abstract

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“…Compared to the other investigated substrates (P-salts, steam-dried digestate), air-dried digestate was not suitable to meet the plants' needs. However, when air-dried digestate and P-salt were combined, there was a synergetic effect on the biomass yield of the plants investigated [40].…”

Section: Introductionmentioning

confidence: 91%

Short-Term Nitrogen Uptake of Barley from Differently Processed Biogas Digestate in Pot Experiments

2019

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The use of biogas digestate as fertilizer is limited by the farm nutrient balance. Mechanical separation and drying of digestate increases its transport worthiness as well as the economic feasibility of nutrient export. This study compares the fertilizer effect of four treatments of digestate originating from two biogas plants: untreated digestate, liquid and solid fraction of separated digestate and dried solid fraction of separated digestate. Pot experiments with barley were performed with two fertilization levels for different digestate variants. Above-ground biomass yield, nitrogen (N) and phosphorus (P) content in biomass and plant uptake efficiency were highlighted. The results showed that all variants have higher above-ground biomass yield than the control. Due to the reduced amount of easily available N, short-term N uptake of barley from solid fractions of digestate was low. The treatments with the dried solid fraction at low fertilization level showed up to 59% lower N removal from soil and, at high fertilization level, up to 83% lower N removal compared to the respective fresh solid fraction (100%). Depending on the feedstock of biogas plants and processing of digestate, N availability varied and influenced the short-term N uptake. It is recommended that digestate processing should be combined with ammonia recovery to prevent N losses to the environment.

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Phosphates recycled from semi-liquid manure and digestate are suitable alternative fertilizers for ornamentals

Cited by 21 publications

References 33 publications

Availability of phosphorus recovered from waste streams to plants cultivated in soilless growing media

Availability of phosphorus recovered from waste streams to plants cultivated in soilless growing media

Valorisation of Agricultural Digestate for the Ammonium Sulfate Recovery and Soil Improvers Production

Short-Term Nitrogen Uptake of Barley from Differently Processed Biogas Digestate in Pot Experiments

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