Maximizing Productivity from Wastewater: Irrigation, Soil, and Crop Management Strategies Fifth Regional Workshop ‘Safe and Productive Use of Wastewater.

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Presentation transcript:

Maximizing Productivity from Wastewater: Irrigation, Soil, and Crop Management Strategies Fifth Regional Workshop ‘Safe and Productive Use of Wastewater in Agriculture’, March 2013, Bali, Indonesia Manzoor Qadir (UNU-INWEH) Javier Mateo-Sagasta (FAO)

Wastewater: Opportunities for Crop Production  Stable source of water with reliable availability of irrigation water amid water scarcity  Savings on fertilizer use (wastewater contains nutrients), i.e. cheap source of nutrients with no or little amount of fertilizer needed

Wastewater: Risks for Crop Production  Salinity/sodicity  Specific ion toxicity  Suspend solids Boron toxicity Clogged drippers Salinity/sodicity

How can we maximize agricultural productivity and benefits from wastewater while minimizing risks? Some on-farm strategies

Irrigation, soil, and crop management strategies for wastewater use in agriculture Crop selection Soil managementIrrigation management Qadir, Drechsel, Raschid-Sally (2008) Wastewater use in agriculture: Agronomic considerations. Encyclopedia of Water Science: FAO (2003) Users manual for irrigation with treated wastewater. FAO Regional Office for the Near East, Cairo, Egypt.

Crop Selection based on  Market value/demand  Crop irrigation requirement inline with water availability  Crop diversification/restriction where untreated wastewater is used for irrigation  Stress tolerance for salts, heavy metals, boron, etc.

Crop Selection based on Stress Tolerance

Irrigation Management  Water quality: blending with freshwater or cyclic application with good-quality water  Irrigation method: flood irrigation (low cost and low WUE), manual irrigation with watering cans, furrow irrigation, sprinkler irrigation, and drip irrigation (high cost and high WUE)

Irrigation Management  Irrigation scheduling/frequency/rate e00.htm ftp://ftp.fao.org/agl/aglw/fwm/Manual9.pdf  Leaching and drainage

Soil Management based on  Soil characteristics (sandy soils, clay soils…)  Soil amendment needs (e.g. use of gypsum in case of highly sodic wastewater)  Soil nutrient availability (fertilizer management)

Some other selected publications

Conclusions  Recovery of water and nutrients from wastewater offers multiple opportunities for crop production.  These opportunities can translate into increased productivity and income for farmers if appropriate irrigation, crop, and soil management strategies are implemented.