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| Titel |
ADDING VALUE TO ASH AND DIGESTATE (AVAnD): PERFORMANCE OF NOVEL SOIL
AMENDENTS ON THE SOIL-PLANT SYSTEM UNDER GLASSHOUSE CONDITIONS |
| VerfasserIn |
Alfonso Lag-Brotons, Rachel Marshall, Ben Herbert, Lois Hurst, Nick Ostle, Ian Dodd, John Quinton, Ben Surridge, Farid Aiouache, Kirk T. Semple |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250153483
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| Publikation (Nr.) |
 EGU/EGU2017-18467.pdf |
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| Zusammenfassung |
| Resource recovery from waste plays a central role in strategies tackling current
worldwide sustainability problems. In this sense, two waste streams derived from
bioenergy production (anaerobic digestion and incineration), digestate [D] and
biomass ash [A], may be especially valuable within agriculture. These materials
offer complementary plant nutrient profiles for alternative fertiliser production (i.e.
nitrogen [N] from D and phosphorus [P] from A). In addition, incorporating these
materials into the soil could impact upon several soil/plant characteristics, and have
positive effects on ecosystem services (eg. nutrient cycling). Therefore, this present
work assessed the effects of A/D blends on the soil-plant system under controlled
conditions (glasshouse). The overarching aim of “Adding Value to Ash and Digestate
[AVAnD]” project is to identify novel nutrient-recycling pathways to maximise
soil quality and crop productivity utilising waste streams derived from bioenergy
production.
Two pot experiments of 6 weeks duration were carried out [Exp. A and Exp. B] using
contrasting agricultural soils (neutral loam and sandy acidic soil) and wheat as the
crop. A factorial randomised block design was selected, with fertilisation treatment
and soil condition (planted/unplanted) as factors. Fertilisation treatments (n=13)
were applied at a rate of 63/60 kg N/P2O5 per ha and comprised: control ([C], no
fertilisation), urea [U], urea+superphosphate [U+P], fly ash [A1], bottom ash [A2], U+A1;
U+A2, anaerobic digestates [D1, D2] and ash/digestate blends [D1A1, D1A2, D2A1,
D2A2]. Each block (n=5) contained 8 planted and 5 unplanted pots (104 planted + 65
unplanted experimental units). At the end of the experiment, all the plants were assessed
for morphometric traits, while for tissue elemental analyses the total number of
replicates per treatment was randomly reduced (n=5/treatment). Soil physico-chemical
properties (i.e. available nitrogen, pH) were assessed in unplanted and selected planted
pots.
Differences in plant growth were primarily dependant on soil type and secondarily on
fertiliser type. In Exp. A, adding digestate-based treatments resulted in comparable biomass
and N levels (concentration and uptake) to that of inorganic fertilisers (U+P). In Exp. B,
growth was mainly related to soil pH, with higher biomass in those treatments containing A1.
In relation to soil properties, the main effects were attributed to pH variation and increase of
available N- / P- and EC. Based on these results, these novel materials and inorganic
fertilisers induced similar effects in the soil-plant system, thus suggesting inorganic fertilisers
could potentially be replaced. However, further research under field conditions, including
other soil types, is required to corroborate the value of these A/D blends as land conditioners. |
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