What technology where? Crop and Environmental Sciences Division International Rice Research Institute Los Baños, Philippines.

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What technology where? Crop and Environmental Sciences Division

Presentation transcript:

What technology where? Crop and Environmental Sciences Division International Rice Research Institute Los Baños, Philippines

Nature of water scarcity (“imposed”, natural, physical, economical) Socio-economic setting (price of rice, price of water, water market, water rights, labor availability, gender issues) Technical infrastructure (water control, irrigation system) Organizational infrastructure (water user groups, irrigation association) Policy (water pricing) Boundary conditions and settings

Yield Low High Water availability Flooded lowland Upland Crack plowing Compaction Good puddling …….. ‘Safe’ AWD Aerobic rice Response options to level of water scarcity Diversification (nonrice crops)

Furrow, Flush, Sprinkler Irrigation SSCSSC Soil Management, Reduced water depth  Y = f (variety, management) Technologies to reduce water input AWDAWD Lowland rice system Aerobic rice system Traditional upland rice system Water availability H ig h LowLow Soil Condition FC S Aerob icc Floode d Yield (t ha -1 )

Cross-over point flooded - aerobic

Scale levelUserObjective FieldFarmerYield, income Small landscapeCompeting farmers Governor, mayor,.. Competing income Votes, regional production Irrigation systemCompeting farmers Managers Hydropower, industry, city Recreation Competing income Equity, production, $$ $$ Region, province, catchment Competing farmers Governor, mayors,.. Hydropower, industry, city Recreation Nature Competing income Votes, production, $$ $$, $$, $$ $$ Various services CountryAll the above, competing Scale considerations

Loss from field is not always loss from system Increasing options for water reuse with increasing scale

Integrated approach Zanghe Irrigation System. 160,000 ha mainly rice Other users: Hydropower, city, industry

Responses Double rice => single rice (same total yield, less water Active promotion AWD Farmer organization in water user groups Volumetric water pricing System modernization (water control, canal lining, water measurement) Thousands of ponds for water reuse

Water re-use through reservoirs and on-farm ponds

More rice using less water!

When water is scarcer than land, maybe maximize water productivity instead of land productivity (= yield) Suppose: Irrigation command area of 10,000 ha Reservoir with m 3 capacity Water shortage: only m 3 available RiceYield (t ha -1 )Water (mm)WP IR Flooded AWD

Conventional (less area) Area (ha) Water used (10 6 m 3 ) Production (10 3 t) Flooded rice8, Fallow2,000-- AWD--- Total10, AlternativeArea (ha) Water used (10 6 m 3 ) Production (10 3 t) Flooded rice5, Fallow--- AWD4, Total10, Two “response options”

Maximized water productivity Higher total production Increased equity among farmers No land abandonment