Tap drip irrigation to save water (The Hindu)

Mains Paper 3: Environment
Prelims level: Drip method of irrigation
Mains level: Significance and benefits of the Drip irrigation system

Context

• Water scarcity has now reached a new level in India.
• While severe drinking water scarcity is noticed commonly everywhere, farmers are facing a lot of difficulties in cultivating crops with reduced water availability in different regions.
• What is worrying is that water scarcity is expected to aggravate further in the near future.

Key observations made by IWMI

• Projections made by the International Water Management Institute (IWMI) indicate that one-third of the world population would face absolute water scarcity by the year 2025.
• NITI Aayog’s report (2018) on ‘composite water management index’ also underlined the depressing state of water stress.
• Though India has the largest irrigated area in the world, about 85 per cent of total irrigation potential (139.90 million hectares) has already been created, leaving limited potential for future use.
• An estimate of the Ministry of Water Resources (2008) shows the total demand for water will overshoot the supply by 2050.
• There’s much scope for easing water scarcity in agriculture. The agricultural sector (irrigation) currently consumes about 80 per cent of water in India.
• Data on water use efficiency indicates that India uses 2-3 times more water than major agricultural countries like China, Brazil and the US to produce one unit of food crop.

Benefits of drip irrigation

• Drip method of irrigation (DMI) has been found to increase water-use efficiency by saving a substantial amount of water.
• Unlike FMI, the drip method supplies water directly to the root zone of a crop through a network of pipes and emitters.
• Since it supplies water directly to the crop, rather than the land around, water losses occurring through evaporation and distribution are significantly reduced.
• The on-farm efficiency of the drip irrigation system is estimated to be over 90 per cent; it is only 35-40 per cent for FMI.

Introduce DMI in India

• DMI was introduced in India during the mid-1980s primarily to save water. But it generates a lot of other benefits as well.
• That there is water saving of 30-70 per cent for different crops under DMI when compared to FMI has been well established.
• While reducing the cost of cultivation substantially, especially in irrigation, weeding and inter-culture, DMI also helps increase the productivity of different crops by 30-90 per cent.
• Reduced water consumption also curtails the use of electricity for operating pumpsets.
• With better productivity and quality of crops cultivated under DMI, farmers are able to realise substantially higher income.
• A nationwide study conducted to find out the impact of National Mission on Micro Irrigation (NMMI) during 2014 covering 13 States reveals that DMI has benefited farmers significantly.
• While increasing productivity by 42-53 per cent in fruit and vegetable crops, DMI helps reduce irrigation cost by 20-50 per cent, electricity consumption by around 30 per cent and fertiliser consumption by about 28 per cent.
• Maharashtra is probably the first State to have taken a number of initiatives subsidy programme being one such to popularise DMI even during the mid-1980s.

Steps needed to avoid water scarcity problem

• To achieve the objective of ‘per drop more crop’, the Central government is taking a series of efforts to increase its adoption.
• While Centrally-sponsored schemes have been in vogue since the early 1990s, the National Mission on Micro-Irrigation (NMMI) introduced during 2010-11 and the Pradhan Mantri Krishi Sinchayee Yojana (PMKSY) launched in 2015 have significantly increased DMI adoption.
• As a result, the area under DMI has risen from a mere 1,500 ha in 1985-86 and 70,859 ha in 1991-92 to 4.24 million hectares as on March 2017.
• India has enormous potential for DMI, which should be harnessed to reduce water scarcity. The Indian National Committee on Irrigation and Drainage, in its report on Drip Irrigation in India, indicates that about 80 crops can be grown viably under DMI.
• Although DMI is considered to be highly suitable for wide spaced and high-value commercial crops, it is also being used for cultivating oilseeds, pulses, cotton and even paddy and wheat.
• The area under DMI has risen sharply in recent years but it is still far lower than the potential.

The agenda ahead

• The Task Force on Micro-Irrigation in India (2004) estimated India’s total drip irrigation potential at 27 million hectares as.
• In spite of having many advantages, the area under drip-irrigation accounts for a mere 4 per cent of gross irrigated area and about 15 per cent of its total potential as of 2016-17.
• The adoption of DMI is also concentrated only in a few States.
• With the current pace of adoption, it may take a long time to achieve full potential.
• Given the looming water scarcity and variations in rainfall pattern due to climate change, more efforts are needed to increase the pace of DMI coverage.
• First of all, the capital cost required for DMI should be brought down substantially.
• A special subsidy programme may be introduced for water-intensive crops like sugarcane, banana and vegetables.
• A differential subsidy scheme for water-scarce and water-abundant areas should be introduced.
• Subsidy is provided to a maximum of five hectares per beneficiary under NMMI, which should be done away with.
• All the areas of sugarcane cultivated using groundwater should be brought under DMI within the next 10-15 years.

Conclusion

• For encouraging the adoption of drip irrigation, a special scheme may be introduced linking bank loan facility for digging wells with electricity connection for pumpsets to those farmers who are ready to adopt drip irrigation.
• Currently, water from surface sources (dams, reservoirs, etc) is not used for DMI.
• At least 10 per cent of water from each irrigation project should be allocated only for DMI.
• Appropriate pricing of canal water and electricity will also help in increasing the area under DMI.

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Prelims Questions:

Q.1) Which of the following statements is/are correct with respect to the Green Good Deeds Movement/ Campaign?
1. It has been launched by the NITI Aayog to sensitise people and students, in particular about
climate change and global warming.
2. The BRICS Ministerial on Environment has agreed to include ―Green Good Deeds‖ in its official agenda.

Select the correct answer using the code given below:
(a) 1 only
(b) 2 only
(c) Both 1 and 2
(d) Neither 1 nor 2

Answer: B
Mains Questions:
Q.1) With this alarming scenario made by the International Water Management Institute, how are we going to solve the ever increasing water scarcity problem?