gates convening presentation bamako may 2014
TRANSCRIPT
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Creating an EverGreen AgricultureThe Vision & The Evidence
Dennis GarrityDistinguished Board Research Fellow
World Agroforestry Centre
UN Drylands Ambassador
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Perfect Storm of Challengesin the Drylands
• Rainfall is becoming more erratic and extreme. • Temperatures are increasing, intensifying
crop stress. • Soil fertility is declining in many regions.• Inorganic fertilizers are increasingly expensive. • Population growth rates remain very high and farm sizes are rapidly declining. Farming is expanding into more marginal lands.
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What is Evergreen Agriculture?
A form of more intensive farming that integrates trees into crop and livestock production systems.
Evergreen farming systems are systems that feature both perennial and annual species (food crops and trees), maintaining a green cover on the land throughout the year.
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Functional Forms of EverGreen Agriculture in Cropping Systems
1. Directly increasing crop yields and stabilizing yields under drought and heat stress, while…Providing co-benefits of dry season livestock fodder, fuel wood supplies for household use and sales, or
2. Providing products of higher cash value or nutritional value than the same area occupied by food crops (Land Equivalent Ratio).
In both cases also providing additional environmental services: Soil health regeneration, Microclimatic buffering, Carbon accumulation, etc
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Types of Evergreen Agriculture
1. Farmer-Managed Natural Regeneration (FMNR) on cropland
2. Conservation agriculture with trees (CAWT)
3. Conventional agriculture interplanted with trees
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Refining EverGreen Agriculture to the Key Farming Systems of Africa
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A Desertifying Landscape Southern Niger in the 1980s
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Farmer-Managed Natural Regeneration on crop fields: Initial Stages
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A Parkland Renaissance on Niger farmlands
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The albida halo effect
• Microclimate buffering
• Soil fertility improvement
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Microclimatic variation: Temperature
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Effect of F. albida on wheat yield, biomass and dry matter according to different radius away from the tree’s canopy in Central part of Tigray (Girmay, 2013)
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Trees keep Ethiopia’s wheat cool and productive CIMMYT trials
Preliminary results under F. albida in Ethiopia
•Lower temperatures under the trees
•Soil moisture increases greatly under the canopy,
•Higher Stover and grain yield under the canopy
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Aerial view of a parkland dominated by Faidherbia in Niger
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Farmer-managed regreening in Niger
• 5,000,000 hectares re-greened in 20 years -- no outside investment costs
-- no recurrent costs to government
• 200 million new trees established • Additional cereal production/year at least
500,000 tons• At least an additional 2.5 million people
fed; 1.25 million farm households involved• Vast increase in fodder for livestock
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Major agroforestry regions in West Africa and directions of expansion
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Types of Evergreen Agriculture
1. Farmer-Managed Natural Regeneration (FMNR) on cropland
2. Conservation agriculture with trees (CAWT)
3. Conventional agriculture interplanted with trees
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Refining EverGreen Agriculture to the farming systems of Africa
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Evergreen agriculture with Faidherbia albida in Zambia.
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Faidherbia Trial Results in Zambia
Maize yield - zero fertiliser
2008 2009 2010 ----- Tons/ha -------
With Faidherbia 4.1 5.1 5.6
Without Faidherbia 1.3 2.6 2.6________________________________________________________________________________________________________________________________________________________________________________________________
Number of trials 15 40 40
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DroughtDroughtFlood
P addition resumed
Long-term maize yield without fertilizer in a Gliricidia system
P stopped
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Impact of fertilizer trees on maize yield under farmer management
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Plot management Yield (t/ha)
Maize only 1.30
Maize + fertilizer trees 3.05 ____________________________________________________________
2011 Survey of farms in six districts (Mzimba, Lilongwe, Mulanje, Salima, Thyolo and Machinga)
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FaidherbiaGliricidia
Maize stubble
Faidherbia
Gliricidia
Maize
DRY SEASON
WET SEASON
Fertilizer-Fodder-Fuelwood Trees in Food Crop Production Systems
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Malawi National Agroforestry Food Security Programme
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Types of Evergreen Agriculture
1. Farmer-Managed Natural Regeneration (FMNR) on cropland
2. Conservation agriculture with trees (CAWT)
3. Conventional agriculture interplanted with trees
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Refining EverGreen Agriculture to the farming systems of Africa
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Ranawa, Burkina in 2001
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Ghana and Burkina Faso are the biggest growing nations – while Mali, Benin, Nigeria and Ivory Coast also grow the Shea trees. Source: USAID via http://www.confectionerynews.com/Ingredients/Cocoa-butter-equivalent-demand-rising-rapidly-says-Global-Shea-Alliance
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17 Countries are engaged in EverGreen Agriculture
Farmer Managed Natural Regeneration
Conservation Agriculture with trees
Trees interplanted in conventional tilled cropland
Farmer Managed Natural Regeneration +
Trees interplanted in conventional tilled cropland
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African Climate Smart Alliance Vision: “25-25”
25,000,000 CSA Farmers by 2025
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EverGreen Agriculture Partnership
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Conclusions – Way Forward• The approach of EverGreen Agriculture has
taken root in Africa, and is spreading rapidly• Millions of smallholders are adopting effective
land regeneration methods • Many nations are creating the policy and
institutional environments to favor adoption • The Gates Foundation could be an
instrumental partner in expanding the scope for EverGreen Agriculture in Africa
• The African CSA Alliance provides a great platform to reach 25 million farmers with EverGreen Agriculture during the coming decade