De Neve, Stefaan

Meers, Erik

Michels, Evi

Sigurnjak, Ivona

English

Ghent University Academic Bibliography

1 NITROGEN MINERALIZATION POTENTIAL OF BIO-BASED FERTILIZERS Ivona Sigurnjak, E. Michels, S. De Neve, E. Meers 11th International Conference on Renewable Resources & Biorefineries 3 – 4 – 5 2015, York, UK OUTLINE  2 NUTRIENT PARADOX  3 Sutton et al.  Our Nutrient World: Global overview on nutrient management (2013) NUTRIENT PARADOX  4 Sutton et al.  Our Nutrient World: Global overview on nutrient management (2013) NUTRIENT PARADOX  5 NUTRIENT SURPLUS NUTRIENT IMPORT NITROGEN AVAILABILITY  6 time MAY                       JUNE                     JULY                   AUGUST                    SEPTEMBER                  OCTOBER N crop demand Crop requirement Nutrient release from manure NITROGEN AVAILABILITY  7 time MAY                       JUNE                     JULY                   AUGUST                    SEPTEMBER                  OCTOBER N crop demand Mineral fertilizer requirement NITROGEN AVAILABILITY  8 time MAY                       JUNE                     JULY                   AUGUST                    SEPTEMBER                  OCTOBER N crop demand Emission losses from slow release LEGAL ASPECTS  9 Manure application in NVZ limited up to maximum of 170 kg N ha-1 (Nitrates Directive 91/676/EC) Synthetic N fertilizer Animal manure Synthetic N fertilizer Animal manure Theory Practice 250 170 Crop N requirements (kg N ha-1) Phosphorus impact OBJECTIVE  10 Manure application in NVZ limited up to maximum of 170 kg N ha-1 (Nitrates Directive 91/676/EC) Synthetic N fertilizer Animal manure Theory 250 170 Crop N requirements (kg N ha-1) Objective Animal manure Bio-based N fertilizer Nutrient  recovery Sustainable agriculture MATERIAL AND METHODS  11 Solid fraction of digestate (P-rich) Liquid fraction of digestate (NK-rich) Separation Mineral concentrate (NK-rich) MATERIAL AND METHODS  12  Parameters Animal manure Digestate LF digestate Mineral Concentrate AM DIG LFDnon-animal LFDanimal MCA MCH DM (%) 8.5 7 6.3 2.3 4.9 3.5 OM (%) 5.8 4.83 3.5 1.3 3.1 1.7 C/N 5.7 6.2 2.9 1.5 4.3 1.3 Ntot (g kg-1 FW) 5.6 4.3 6.6 4.7 4.0 7.3 NH4-N (g kg-1 FW) 3.3 2.2 4.1 3.6 3.8 5.9 P2O5 (g kg-1 FW) 4.8 2.4 2.7 0.064 0.049 0.71 K20 (g kg-1 FW) 4.0 2.6 5.3 3.6 4.1 8.8 NH4-N/N 0.59 0.51 0.62 0.76 0.95 0.80 N-K fertilizer with lower P   MATERIAL AND METHODS  13 • Fertilization advice for maize cultivation on sand - loam soil: • N effective = 150 kg ha-1 • P2O5 = 80 kg ha-1 According to effective N MCA MCH Animal manure Digestate LFD animal LFD non-animal Synthetic N ton/ha of product 37,50 20,55 44,64 58,14 31,91 22,73 0,56 P2O5 added in kg/ha 1,84 14,59 214,29 139,53 2,04 61, 36 0,00 Corrections for P2O5 MCA MCH Animal manure Digestate LFD animal LFD non-animal Synthetic N ton/ha of product 37,50 20,55 16,66 33,33 31,91 22,73 0,56 P2O5 added in kg/ha 1,84 14,59 79,97 79,99 2,04 61, 36 0,00 MATERIAL AND METHODS  14 MATERIAL AND METHODS  15  Experiment duration: 120 days  8 treatments (n=4): in total 192 tubes  every 20 days sampling took place  Aim: evolution of N mineralization rate (%)    RESULTS  16 01234560,05,010,015,020,025,030,035,040,045,00 20 40 60 80 100 120N mineralization rate (%) Mineral N concentrations (mg kg-1 soil) Days Mineral N concentrations in unamended soil  NH4-N (mg kg-1 soil) N03-N (mg kg-1 soil) N mineralization rate (%)RESULTS  17 0204060801001201400 20 40 60 80 100 120N mineralization (%) Days MCH (C:N 1.3)SFMCA (C:N 4.3)Synthetic fertilizer vs. Mineral Concentrate RESULTS  18 0204060801001201400 20 40 60 80 100 120N mineralization (%) Days LFD non-animal(C:N 2.9)LFD animal (C:N1.5)SFSynthetic fertilizer vs. Liquid fraction of digestate RESULTS  19 0204060801001201400 20 40 60 80 100 120N mineralization (%) Days DIG (C:N 6.2)SFAM (C:N 5.7)Synthetic fertilizer vs. Digestate and Animal manure RESULTS  20 0204060801001201400 20 40 60 80 100 120N mineralization (%) Days LFD non-animal (C:N2.9)MCH (C:N 1.3)LFD animal (C:N 1.5)DIG (C:N 6.2)SFMCA (C:N 4.3)AM (C:N 5.7)Synthetic fertilizer vs. Bio-based fertilizer RESULTS  21 Incubation day 120 020406080100120140SF MCH MCA LFD animal LFD non-animalDIG AMN mineralization rate (%) Fertilizers > > > > > CONCLUSION  22  The use of mineral concentrate and LF of digestate exhibited similar mineralization patterns and could therefore be considered as worthy substitues for mineral nitrogen originating from synthetic fertilizers   Characteristics of bio-based fertilizers (eg. LF of digestate) can vary greatly depending on the raw materials used for co-digestion   Recommendations on the bio-based fertilizer use should be type specific and reflect the C/N, N/P and NH4-N/N ratios  FUTURE PERSPECTIVES  23 FUTURE PERSPECTIVES  24 0204060801001201400 20 40 60 80 100 120N mineralization (%) Days   25 Department of Applied Analytical and Physical Chemistry Laboratory of Analytical Chemistry and Applied Ecochemistry   Coupure Links 653 B – 9000 Ghent, Belgium Prof. Dr. ir. Erik Meers Erik.Meers@ugent.be  Dr. ir. Evi Michels Evi.Michels@ugent.be  M.Sc. Ivona Sigurnjak Ivona.Sigurnjak@ugent.be  

Nitrogen mineralization potential of bio-based fertilizers

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Nitrogen mineralization potential of bio-based fertilizers

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Ghent University Academic Bibliography