Phosphorus Availability from German Sewage Sludge Ashes to Plants Cultivated in Soilless Growing Media of Contrasting pH

Hauck, Daniel; Lohr, D.; Meinken, E.; Schmidhalter, Urs

doi:10.3390/agronomy12112610

Cited by 3 publications

(1 citation statement)

References 45 publications

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“…Another technique for fast screening is based on single extraction methods to assess either nutrient availability or the total nutrient contents in growing media ( Handreck, 1995 ; Hauck et al., 2022 ). Several sensor-based techniques are available for assessing and managing the N status of the crop based on optical properties ( Muñoz-Huerta et al., 2013 ).…”

Section: Introductionmentioning

confidence: 99%

Fast screening of total nutrient contents in strawberry leaves and spent growing media using NIRS

Vandecasteele,

Van Waes

2023

Front. Plant Sci.

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IntroductionIn closed-loop soilless cultivation, the main nutrient sinks are nutrients retained either by the crop or in spent growing media. Measurement of nutrients in spent growing media and in the aboveground vegetative plant biomass at crop termination can be a tool for assessing and optimizing nutrient efficiency. The first aim of this study was to test the potential of near-infrared reflectance spectroscopy (NIRS) to forecast the various nutrient contents in strawberry leaves, which would then allow for assessment of crop nutrient status and total nutrient uptake by strawberry plants. The second aim was to test NIRS as a high throughput technique for assessing the N, K, Ca, Mg and organic matter (OM) content and the pH, EC and C:N and C:P ratios for a dataset of composts, plant fibers and spent growing media. The NIRS prediction model for fast screening of the total nutrient contents in spent growing media was compared with a single extraction method.MethodsA database with 369 dried and ground strawberry leaf samples with known contents of N, P, K, Ca, and Mg were scanned using NIRS. The database covered a range of leaf contents of 6-35 g N/kg dry matter (DM), 0.7-6.3 g P/kg DM and 2-29 g K/kg DM. A dataset of 458 samples of different types of materials used in growing media was validated with a dataset of 109 samples.ResultsValidation for the strawberry leaves indicated potential for this application, with R2 values of 0.90 or higher for N, K and Ca, and R2 values higher than 0.85 for P and Mg. Validation for the dataset of composts, plant fibers and spent growing media also indicated the potential for this application, with R2 values of 0.90 or higher for organic matter, and with R2 values of 0.85 or higher for total Ca, pH and C:N. A first test indicated potential for the calibration based on fresh samples of compost, plant fiber as well as spent growing media or dried (not ground) samples.DiscussionUse of NIRS on fresh samples would eliminate the need for drying and grinding the samples and would reduce screening time. The ammonium acetate extraction is a reliable alternative to NIRS for fast screening of the total P, K, Ca, and Mg contents in composts, plant fibers and spent growing media.

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Section: Introductionmentioning

confidence: 99%

Fast screening of total nutrient contents in strawberry leaves and spent growing media using NIRS

Vandecasteele,

Van Waes

2023

Front. Plant Sci.

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P-recovery versus current sewage sludge treatment policy in the Czech Republic and Japan

Hušek,

Homma,

Moško

et al. 2023

Clean Techn Environ Policy

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Phosphorus is an important element for agriculture and industry, but its deposits are not uniformly distributed. Countries that do not have primary sources are dependent on imports or regeneration from secondary materials. A widely available secondary source is sewage sludge. Used environmental standards govern sludge treatment, but its inclusion in the raw material policy is often missing. We focus on the Czech Republic (a European Union member) and Japan, countries without phosphorus deposits. Based on our analysis of sewage sludge flows, legislation, and technologies used, we aimed to evaluate approaches towards sustainable phosphorus policy. We figured out that in the Czech Republic, sludge application to soil continues due to legislation deregulation and thus, various pollutants enter the soil along with the sludge. In Japan, thermal treatment predominates, but ash is not processed, and phosphorus is irreversibly lost in landfills or construction. By not implementing a functional P-recovery policy, both countries lose more than 13 % replacement of phosphorus fertilisers from their sources. Graphical Abstract

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Plant and Soil Effects of Alternative Sources of Phosphorus over Three Years of Application

Karpinska,

Kakouli-Duarte,

Ashekuzzaman

et al. 2024

Agronomy

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Plant growth and food security depend heavily on phosphorous (P). Recovering and recycling P from animal, municipal, and food waste streams can significantly reduce dependency on traditional mineral P. This is particularly pertinent in the EU regions with limited native P supplies. The agronomic performance of including P-based recycling-derived fertilisers (two struvite and two ashes) or cattle slurry was compared to a conventional mineral P fertilisation programme along with no P and no fertiliser controls over three years. A field-scale experiment was set up to evaluate the perennial ryegrass dry matter yield (DMY), P uptake, and soil test P effects. Struvite, ash, and cattle slurry proved effective in replacing P mineral fertiliser and produced yields similar to those of the mineral fertiliser programme. Differences were observed in plant P recovery, with struvite-based programmes achieving a significantly higher P recovery than ash-based programmes, which had the lowest plant P recovery. Differences in Morgan’s soil test P were also noted, with potato waste struvite (PWS) and poultry litter ash (PLA) showing significantly higher soil test P values. The findings strongly indicate that a range of recycled bio-based fertilisers from the bioeconomy can be used to reduce reliance on conventional imported mineral P fertiliser, with some programmes based on recycled fertilisers even surpassing the performance of conventional linear economy mineral fertilisers.

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Phosphorus Availability from German Sewage Sludge Ashes to Plants Cultivated in Soilless Growing Media of Contrasting pH

Cited by 3 publications

References 45 publications

Fast screening of total nutrient contents in strawberry leaves and spent growing media using NIRS

Fast screening of total nutrient contents in strawberry leaves and spent growing media using NIRS

P-recovery versus current sewage sludge treatment policy in the Czech Republic and Japan

Plant and Soil Effects of Alternative Sources of Phosphorus over Three Years of Application

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