What new types of organic fertiliser are today available for Mediterranean soils? What are the benefits, limitations and perspectives for new developments? - Maria Pilar Bernal - CEBAS-CSIC, Murcia, Spain
Presentation at the 1st Summit of the Organic Fertiliser Industry in Europe (SOFIE), 5 - 6 June 2019, organized by the European Sustainable Phosphorus Platform (ESPP, www.phosphorusplatform.eu).
All outcomes of the conference can be found at http://www.phosphorusplatform.eu/SOFIE2019
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What new types of organic fertiliser are today available for Mediterranean soils? What are the benefits, limitations and perspectives for new developments? - Maria Pilar Bernal - CEBAS-CSIC, Murcia, Spain
1. What new types of organic
fertilisers are available for
Mediterranean soils?
What are the benefits, limitations and
perspectives for new developments?
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Dr. Maria Pilar BERNAL
Research Professor
CEBAS-CSIC. Murcia, Spain.
2. Soil Organic Matter
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Hiederer R. 2013. Mapping Soil Properties for Europe. Spatial
Representation of Soil Database Attributes. European Commission,
Joint Research Centre.
3. Organic fertilisers – 1G
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Animal manures
Slurry
Crop residues
Municipal solid wastes
Biowastes
Sewage sludge
Biosolids
Agro-food residues
Soil application
• Nutrients and OM used for crop
production.
• Soil fertility maintained.
• Minimum environmental impact.
• Nutrient balance: production/need
Traditional farming
4. Livestock – arable farming split
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Intensive & specialised farming systems
Economic efficiency.
Mechanised management.
Precision agriculture.
Change: manure to slurry.
Manure accumulation.
Excess of nutrients & OM.
Environmental impact.
Input of fertilisers &
pesticides.
Soil fertility in risk (loss
of OM).
Environmental impact.
Nutrient input Nutrient input
Scarce water sources.
Highly valuable crops.
Intensive production.
5. Organic fertilisers – 2G
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Animal manures
Slurry
Crop residues
Municipal solid wastes
Biowastes
Sewage sludge
Biosolids
Agro-food residues
Wastes
• Excess: not enough agricultural land.
• Pollutants: HM, pathogens.
• Environmental impact.
• Nutrient loss.
• Food safety.
6. Compost
Dry solids
Organic fertilisers – 2G
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Animal manures
Slurry
Crop residues
Municipal solid wastes
Biowastes
Sewage sludge
Biosolids
Agro-food residues
Separation
Solid
Liquid Depuration
7. Organic fertilisers – 3G
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Animal manures
Slurry
Crop residues
Municipal solid wastes
Biowastes
Sewage sludge
Biosolids
Agro-food residues
• Nutrient cycling.
• Energy recovery.
• C-conservation.
• Environment.
Resources
9. Organic fertilisers in a Circular Economy
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Solid manure
Slurry
Digestate
(Co)-digestion
Separation
SOLID
FRACTION
LIQUID
FRACTION
Liming Composting
Incineration Drying
Pelleting
P-ashes
Organic
fertiliser
Organic
fertiliser
Effuent =
Irrigation
K-fertiliser
(NH4)2SO4
solution
Ammonia
stripping
Biological
treatment
Liming
Evaporation
Filtration
Constructed
wetlands
CompostOrg. Ca-
fertiliser
Treated waterMineral
concentrates
Processing
Processing
Mg/K
struvite
Bio-based fertilisers
Adapted from: EIP-AGRI Focus Group. How to improve the agronomic use of recycled nutrients (N and P) from livestock manure and other organic sources?
Pyrolysis
Biochar
10. Organic fertilisers
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Microbial stability
Reduced moisture
Pathogen and weed destruction
Nutrient concentration
Stable OM
Easy to transport/use
Quality standards
Recognised fertiliser/amendment
× Gaseous emissions
× Investment and running costs
× OM mineralisation & N-loss
× Organic / HM contaminants
Compost Dry solids
Physical stability
Very low moisture
Pathogen and weed destruction
Nutrient concentration
Easy to transport/use
High OM
× Microbial instability
× Gaseous emissions
× Investment and running costs
× High energy requirement
× N-loss
× HM contaminants
Nutrient availability?
11. Organic fertilisers
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Microbial stability
Very low moisture
Pathogen and weed destruction
High-C conservation
Recognised amendment
Production of energy
Reduction of GHG from soil
× High investment and running costs
× High N-loss
× Organic contaminants (PAHs)
× Quality criteria not established
Biochar Ash
Physical stability
Very low moisture
Pathogen and weed destruction
Nutrient concentration
Easy to transport/use
Rich in P and K
× Gaseous emissions
× High energy requirement
× Low in N and C
× HM contaminants
Nutrient availability?
12. Organic-C in compost vs. biochar
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Manures
Biowastes
Biosolids
Food ind.
Biochar
TOC (%)
0
20
40
60
80
100
Compost
TOC > 15%
Solid organic fertiliser
EU fertilising
products
TOC > 7.5%
Soil improver
Biochar
Adapted from: Alvarenga et al.,
2019. in: Climate Change and Soil
Interactions,, M.N.V. Prasad (Ed.)
Chapter 5. Elsevier.
13. Nutrients in Compost vs. Biochar
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Manures
Biowastes
Biosolids
Food ind.
Biochar
TN (%)
0
1
2
3
4
5
6
Manures
Biowastes
Biosolids
Food ind.
Biochar
P2O5 (%)
0
1
2
3
4
5
6
7
8
Compost Compost
Solid organic fertiliserEU fertilising products:
TN > 2.5%
P2O5 > 2%
Total > 4%
Struvite, biochar and ash-based products are not included in categories of component materials, but will be further considered.
Adapted from: Alvarenga et al.,
2019. in: Climate Change and Soil
Interactions,, M.N.V. Prasad (Ed.)
Chapter 5. Elsevier.
14. Digestate
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Drymatter,TOC(%)
0
5
10
15
20
TN,P2O5(%)
0
1
2
3
DM TOC TN P
Liquid organic fertiliserEU fertilising products:
TOC > 5%
TN > 2%
P2O5 > 1%
∑ > 3%
Adapted from: Alvarenga et al.,
2019. in: Climate Change and Soil
Interactions,, M.N.V. Prasad (Ed.)
Chapter 5. Elsevier.
15. Organic fertilisers – 4G
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Source materials:
Organic wastes
Products from waste treatment;
Plant / seaweed extracts.
Why?:
Improve nutrient availability;
Reduce GHGs;
Water use efficiency;
Prevent soil degradation.
Climate Smart Agriculture
16. Recovery of nutrients
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
• P: by precipitation or
struvite formation
• NH3: by stripping
Liquids from
digestate, slurry
• NH3: using gas-
permeable membranes
Animal buildings,
slurry storge tanks,
or composting piles
• P: from manures /
sludges
• K: from plant material
Ash from
combustion
Technology
under
development
Limited
solubility
Quality & P avail.
Concentration
17. Organic fertilisers – 4G
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
• Nutrient enrichment
• Environmental impact
Reduced
emissions
N, P
availability
OM quality
Food safety
• Mineral fertiliser
replacement value
• C-conservation
• Liquid org. fertiliser
Microbial
activation
• Biostimulants
• Nutrient availability
• Limit HM in input
• POPs
• Anti-microbial
resistance
18. Plant Biostimulants
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Improve plant characteristics
Improve soil rhizosphere
• Nutrient use eficiency
• Tolerance to abiotic stress
• Quality traits
• Availability of confined nutrients
in the soil or rhizosphere
Microbial Plant Biostimulants
Azobacter spp.
Mycorrizal fungi
Rhizobium spp.
Azospirillum spp.
Non-Microbial Plant Biostimulants
19. 1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
Source materials
Process developed
Characteristics
evaluated
Quality parameters
Pollutants: HM,
organics
Soil: OM, microbial
activity, etc.
Environmental
implication
Regulation by
legislation
Nutrient efficiency
Biorefinery: Recovery of
nutrients and compounds.
Food safety
Prevention of pollution:
Emerging contaminants
Enhance soil health and
functions
Mitigation of GHGs:
test, evaluation and
implementation.
Cost-benefit
User acceptance
Market development
ChallengesAchievements
20. Future?
1st Summit of the Organic and Organo-Mineral Fertiliser Industry in Europe
pbernal@cebas.csic.es