Alternate wetting and drying method

Alternate wetting and drying method of Irrigation for rice to enhance the productivity and water use efficiency 

Technology Profile 

Irrigated rice occupies 50% area and contributes nearly 70% to total rice production of the country with an average yield of 3.1 t/ha.   India’s food security largely depends on irrigated rice which consumes nearly 50- 60% of our finite fresh water resources. Flooded rice requires 900-2250 mm of water (average 1500 mm) depending on the water management, soil and climatic factors.

  • Rice requires about 3000-4000 lts for producing 1 kg of grain 
  • AWD is also called ‘intermittent irrigation’ or ‘controlled irrigation’ 
  • Alternate flooding Compared with the traditional continuous flooding system, AWD using lowland rice cultivars can reduce water input by 15-30% without any yield loss
  • It can be practiced with Bouman’s tube .

Context 

Need – Water saving is must in rice as it consumes > 50% of irrigation water of crops 

Existing practices- Flooding the field and inundation of 5-10 cm in the feild requires more than 1500mm ha 

Potential losses: Water loss, Nutrient losses, soilpollution, reduced productivity 

Areas: In all rice growing areas in Telangana and Andhrapradesh especially borewell irrigated area where controlled irrigation is practiced 

Empirical Evidences 

Demonstration yields and incomes 

  • AWD is also called ‘intermittent irrigation’ or ‘controlled irrigation’ 
  • Alternate flooding Compared with the traditional continuous flooding system, AWD using lowland rice cultivars can reduce water input by 15-30% without yield loss

Practical utility/Scalability 

  • Saving in 30% of water input 
  • Enhancing the water productivity 
  • Reduced incidence of pests and diseases 
  • Increase in productivity
  • Very easy to scale up
  • More than 500 farmers adopted it and found promising

 


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