“Modern” Farming and Rural Poverty - Pros and Cons of SRI - Presentation Transcript
“ Modern” Farming and Rural Poverty Pros and Cons of SRI Willem A. Stoop 23 January 2009 IFAD, Rome
Personal Background
Soils and agronomy (Wageningen and UH)
Rubber agronomist Liberia
Postdoc CIMMYT (Maize agron.) Mexico
Agronomist ICRISAT / Burkina Faso
Tropical Rainfed Cereal Systems - KIT/RTI
ISNAR - The Hague : NARS organisation
KIT/RTI : Systems research
Independent consultant / WARDA
IFAD website
1,05 billion poor women, men and children in developing countries
Poor populations mostly in rural areas
Depend mostly on agriculture and related activities for livelihoods
Do the “rural poor” require specific agricultural techniques? and if so How might these techniques differ from the conventional ones that are readily available? or What type of agronomy would be most relevant to the poor?
System of Rice Intensification (SRI) developed in Madagascar during 1980s in response to the conditions, needs and means of resource-poor smallholders
Madagascar: (rice) field micro diversity and smallholder adaptation
Major contrasts between “modern” and “smallholder” rice farming
Modern Farming :
Large / intermediate scale
Commercial
Mechanised
External inputs (seeds, ag.chemicals)
Capital intensive
Smallholder farming :
Small – variable scale
Self sufficiency – surplus
Mainly manual
Local inputs (seeds, manure, compost, etc.)
Labour intensive
Madagascar: SRI local variety
Major elements of SRI as compared with conventional practices
SRI:
very low seed rates
very young transplants:
8 to 15 days old
single transplants/hill
wide spacing:
25x25 to 50x50 cm
no flooding, moist soil
compost
3 to 4 rounds rotary hoe
Conventional irrigated:
high seed rates
young transplants:
about 21days old
3-5 transplants/hill
narrow spacing:
10x10 to 20x20 cm
continuous flooding
min. fertilizer + N topdressing
2 rounds rotary hoe / herbicide
Bouake 189 : SRI-responsive improved variety
Varietal responses to conventional irrigated (left) and to SRI (right)
Crucial plant features in obtaining high yields with SRI
Profuse tillering
Profuse root systems
“ What will be the optimum bio-physical growth conditions that cause these features to translate into high grain yields?”
Pros and cons of SRI
Pros
Substantial savings :
*Seed (suitability of local varieties)
*Seed rates: 1/5 to 1/10
*Irr. Water: approx. 30-50%
*No or limited agric. chem’s
*Tolerance to drought and lodging
Incr. resource use efficiency
No envirm. pollution
Cons
Labour requirements ??
*Delicate timing of operations
*Increased (early) weeding
(Precise land levelling)
(Reliable water source/supply)
Risks??
*Delicate, small transplants
*Early floods
*Local socio-institutional: avail. irrig. water / land tenure issues.
SRI is NOT a “free lunch” or “blue-print”
It requires farming skills: timely management of operations and efficient use of internal resources.
With experience SRI can produce attractive grain yields without or with minimal use of costly external inputs through very simple agronomic adjustments.
SRI must be viewed as part of a (integrated) farming system.
Location/farmer-specific adaptations are crucial.
Most initial constraints/risks are of a farm management nature.
Possible barriers to SRI dissemination
For past decades farmers have been bombarded with recipes for “green revolution” technologies including new seeds and agric. chemicals (mineral fertilisers, herbicides and pesticides).
By comparison SRI advises something like an “opposite” combination of practises.
Certainly in Africa, foreign aid and public extension services have lost much of their credibility with small farmers.
Implications for dissemination of SRI
“ Learning” exercise for farmers, extension and scientists:
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