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BRINGING CSAPRACTICES TO SCALE:
ASSESSING THEIR CONTRIBUTIONSTO NARROW
NUTRIENTAND YIELD GAPS
(CROPNUTRIENTGAP PROJECT)
In...
Objectives (impact-oriented)
• To enable the local and regional governance levels and
the private sector in SSA (Ethiopia,...
West and East Africa aggregated
Van Ittersum et al., 2016. PNAS
If a successful intensification is not achieved ...
The consequences in terms of:
• cereal self-sufficiency and/or
• area ...
Food – climate - profit
6
Soil - Crop
Nutrient
management
Climate
Profit
Food
output
Activities and Outputs
7
From yield gaps to nutrient gaps
www.yieldgap.org
Yield gap: Yw – Ya: t/ha Nutrient input gap for 50%Yw-Ya
4 ’Rights’
source
rate
time
place
Nutrient management options
Good
agronomy
(synergy
between
inputs)
Using
legumes in
rota...
Nutrient input gaps
Country Station Yw Pessimistic (no nutrient cycling) Country Station Yw Optimistic (full nutrient cycl...
11
Trade-off curves
Cf. Bos et al., 2017. Ag. Systems
TEDs with biophysical and socio-economic attributes
Small Rel Yg Medium Rel Yg Large Rel Yg
High Risk
High feasibility Hig...
Input Actions Output Outcome Impact
Nutrient
Packages (4Rs)
at local level &
outscale potential
GYGA TED
Zonation
TAMASA,
...
Key users
• Global-international:
• International Fertilizer Association
• Yara
• IPNI
• CCAFS
• IPCC
• Ethiopia (with TAM...
Further fostering outcomes
• New project (NWO): Scaling Nutrient Management tools in
Africa
• In collaboration with TAMASA...
© http://www.riennijboer.nl/
Thank you for your attention!
Future harvest
IP: Nutrient Gaps at regional level
Input
Action
Output
Outcome
Impact
18
Current GYGA Atlas
Add the modelled Nutrient Gap...
The challenge: tunnelling through
Zhang et al., Nature, 2015
Bringing CSA Practices to Scale: Assessing their contributions to narrow nutrient and yield gaps
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Bringing CSA Practices to Scale: Assessing their contributions to narrow nutrient and yield gaps

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Crop Nutrient Gap Project

Update presented on September 15, 2017 to CCAFS at Wageningen University and Research Centre.

In association with IFA, University of Nebraska, YARA, and Global Yield Gap Atlas.

Published in: Science
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Bringing CSA Practices to Scale: Assessing their contributions to narrow nutrient and yield gaps

  1. 1. BRINGING CSAPRACTICES TO SCALE: ASSESSING THEIR CONTRIBUTIONSTO NARROW NUTRIENTAND YIELD GAPS (CROPNUTRIENTGAP PROJECT) Introduction meeting with CCAFS leadership Wageningen – September 15, 2017 1
  2. 2. Objectives (impact-oriented) • To enable the local and regional governance levels and the private sector in SSA (Ethiopia, Kenya, Tanzania) with sustainable intensification packages in terms of nutrient use that are simultaneously sensible from a climate change and food security perspective. • Focus on maize-legume systems in Ethiopia, Kenya, Tanzania
  3. 3. West and East Africa aggregated Van Ittersum et al., 2016. PNAS
  4. 4. If a successful intensification is not achieved ... The consequences in terms of: • cereal self-sufficiency and/or • area expansion (GHG, biodiversity!) will be huge!
  5. 5. Food – climate - profit 6 Soil - Crop Nutrient management Climate Profit Food output
  6. 6. Activities and Outputs 7
  7. 7. From yield gaps to nutrient gaps www.yieldgap.org Yield gap: Yw – Ya: t/ha Nutrient input gap for 50%Yw-Ya
  8. 8. 4 ’Rights’ source rate time place Nutrient management options Good agronomy (synergy between inputs) Using legumes in rotations
  9. 9. Nutrient input gaps Country Station Yw Pessimistic (no nutrient cycling) Country Station Yw Optimistic (full nutrient cycling) ETH Debre Markos 9700 ETH Debre Markos 9700 N upt. req. N upt. gap N removal N upt. gap (kg N/ha) (kg N/ha) (kg N/ha) (kg N/ha) Ya 2100 48 - - - - Ya 2100 31 - - - - Yw * 30% 2910 63 13 43 26 19 Yw * 30% 2910 40 8 28 17 12 Yw * 50% 4850 105 55 183 110 79 Yw * 50% 4850 67 35 117 70 50 Yw * 80% 7760 187 137 457 274 196 Yw * 80% 7760 119 87 291 175 125 Country Station Yw Pessimistic (no nutrient cycling) Country Station Yw Optimistic (full nutrient cycling) TANZ Shinyanga 3600 Pessimistic (no nutrient cycling) TANZ Shinyanga 3600 Optimistic (full nutrient cycling) N upt. req. N upt. gap N removal N upt. gap (kg N/ha) (kg N/ha) (kg N/ha) (kg N/ha) Ya 800 17 - - - - Ya 800 11 - - - - Yw * 30% 1080 23 6 20 12 9 Yw * 30% 1080 15 4 13 8 5 Yw * 50% 1800 39 22 73 44 31 Yw * 50% 1800 25 14 47 28 20 Yw * 80% 2880 69 52 173 104 74 Yw * 80% 2880 44 33 111 66 47 Ytarg kg/ha N input gap, 30% rec N input gap, 50% rec N input gap, 70% rec Ytarg kg/ha N input gap, 30% rec N input gap, 50% rec N input gap, 70% rec Ytarg kg/ha N input gap, 30% rec N input gap, 50% rec N input gap, 70% rec Ytarg kg/ha N input gap, 30% rec N input gap, 50% rec N input gap, 70% rec
  10. 10. 11
  11. 11. Trade-off curves Cf. Bos et al., 2017. Ag. Systems
  12. 12. TEDs with biophysical and socio-economic attributes Small Rel Yg Medium Rel Yg Large Rel Yg High Risk High feasibility High feasibility High feasibility Low feasibility Low feasibility Low feasibility Low Risk High feasibility High feasibility High feasibility Low feasibility Low feasibility Low feasibility Ethiopia Kenya Tanzania
  13. 13. Input Actions Output Outcome Impact Nutrient Packages (4Rs) at local level & outscale potential GYGA TED Zonation TAMASA, Geodatics, CSV, related initiatives (sites, data, practices) Current Nutrient Packages Enrich zonation with farming systems Show cases (farm trials) Informed decision makers on regional trade- offs Agri-sector using more efficient nutrient strategies Quantified trade- offs: productivity vs. environment and policy recommendations Low GHG emission per unit yield Higher yields, higher farm income Involve local agri- sector and governmentGYGA Atlas Outlook on fertilizer market, targeted distribution Run experiments / demos Model nutrient gaps, production, emissions, define packages and do farm level trade- off analysis Nutrient Gaps at regional level Support policy on fertlizers and farm nutrient strategy
  14. 14. Key users • Global-international: • International Fertilizer Association • Yara • IPNI • CCAFS • IPCC • Ethiopia (with TAMASA, IMAGINE) • EIAR • ATA • Kenya • Agrics (social enterprise, cf. One-acre fund) • Geodatics • Toyota Tsusho Fertilizer Africa limited • KALRO • Tanzania • Agrics • Geodatics • Yara • Sokoine Agricultural University 15
  15. 15. Further fostering outcomes • New project (NWO): Scaling Nutrient Management tools in Africa • In collaboration with TAMASA • Ethiopia and Tanzania • Wageningen UR (Cees Leeuwis, Martin van Ittersum), CIMMYT (Jens Anderson, Peter Craufurd), EIAR (Gebreyes) and ARI (Arnold Angelo) 16
  16. 16. © http://www.riennijboer.nl/ Thank you for your attention! Future harvest
  17. 17. IP: Nutrient Gaps at regional level Input Action Output Outcome Impact 18 Current GYGA Atlas Add the modelled Nutrient Gaps to the Atlas to explore the need for fertilizer Nutrient Gaps at regional level Analysis of potential fertilizer markets and ways to improve the distribution of fertilizer across the regions Leading to increased productivity (spatial scale: at least 10.000 farmers but probably more via out scaling using TED zonation)
  18. 18. The challenge: tunnelling through Zhang et al., Nature, 2015

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