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Micro-Irrigation | UPSC GS-3 Notes

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Micro-Irrigation | UPSC GS-3 Notes

Micro-Irrigation

Micro-irrigation refers to the application of water to crops in a controlled and efficient manner, usually in small quantities and close to the root zone. It mainly includes drip irrigation and sprinkler irrigation. In India, where agriculture consumes a major share of freshwater and many regions face groundwater stress, micro-irrigation is important for achieving the goal of “Per Drop More Crop”.

Features of microirrigation system

Water is applied via pressurised piping system. Microirrigation requires pumps for developing the required pressure for delivering water through pipelines, regardless of whether the source of water is surface or underground.
Water is applied drop-by-drop for a long period in the case of drip irrigation systems.
Water is applied at a low rate to maintain the optimum air–water balance within the root zone
Water is applied at frequent intervals as per the requirement of plants.
Water is supplied directly to the plants and not to the other areas of the field, thus, reducing wastage.
Soil moisture content is always maintained at ‘field capacity’ of the soil. Hence, crops grow at a faster rate, consistently and uniformly.

Classification of microirrigation system

Microirrigation system can be broadly classified into two categories:
- Drip irrigation system
- Sprinkler irrigation system
Drip irrigation system
- Drip irrigation system, also known as ‘trickle irrigation system’, is a method of applying the required amount of water directly to the root zones of plants through drippers or emitters at frequent intervals.
- In this system, water is applied drop-by-drop or by a micro jet on the soil surface or sub-surface at a rate lower than the infiltration rate of the soil.
Sprinkler irrigation system
- Sprinkler irrigation is a method of applying water in a manner similar to rain.
- It is suited for most row, field and tree crops.
- Water can be sprayed over or under the crop canopy.
- If a site is known to be windy most of the time, sprinkler irrigation will not be suitable.

Advantages of microirrigation system

Helps in saving water
- Water requirement in drip or sprinkler irrigation is much less as compared to any other conventional method of irrigation. This is because of irrigation of a smaller portion of land, decreased evaporation from the soil surface and reduction or elimination of run-offs.
- Waterlogging, which occurs under flat surface flood irrigation, is rare in case of microirrigation.
- Since the microirrigation system allows a high level of water control application, water can be applied only when needed and losses due to deep percolation can be minimised or avoided.
- Microirrigation can reduce water usage by 25–40 per cent as compared to overhead systems and 45–60 per cent as compared to surface irrigation.
Uniform water application
- Microirrigation systems ensure uniform water application. Therefore, all plants in a field receive equal amounts of water.
- Higher uniformity results in efficient irrigation, thereby, causing less wastage of water, power and fertilisers.
- Consistent water application results in better and uniform crop yields as each plant is given the required amount of water and nutrients for optimum growth. Crop yield is the measurement of the amount of agricultural production harvested per unit area.
Helps in saving electricity
- Microirrigation systems require less electricity as compared to other systems. Usually, delivery pipes in microirrigation systems operate at low pressure (2–4 bar). Therefore, these require less energy for pumping.
Improves chemical/fertilizer application
- Microirrigation systems can apply chemicals to plants through fertigation units.
  - ‘Fertigation’ is the application of fertilisers used for making soil amendments in order to improve plant growth.
- Since the fertilisers are applied directly to the root zones of the plants, a reduction in the total amount of fertiliser applied is possible, which saves an average of 25–50 per cent of the total cost.
- Microirrigation systems apply the right fertiliser to the plants at a given time.
- Herbicides, insecticides and fungicides can also be applied through microirrigation systems, and thereby, help improve the crop yield.
Reduces weeds and diseases
- Weeds are the unwanted plants that grow in lawns, gardens and agricultural fields. They compete with the crops for nutrients, moisture and sunlight, which can reduce the crop quality and the yield. These also serve as a habitat for diseases and insect-pests, which attack the main crop.
- Weed growth is inhibited in areas irrigated by drip irrigation as only a limited area gets irrigated. Hence, the threat of weeds and diseases is reduced.
Improves tolerance of crops to soil salinity
- Microirrigation reduces the sensitivity of most crops to saline water or soil–water conditions due to high moisture content in the root zones of plants. Microirrigation (especially, drip irrigation) keeps the soil moisture continuously at a high level near the root zone, and thus, maintains a low level of salt concentration. Therefore, crops under microirrigation system are more tolerant to saline water.
Suitable to various topography and soil type
- Microirrigation systems can function efficiently on any topography, if appropriately designed and managed. Low water application rate with microirrigation systems is ideal for clayey soil as water can be applied slowly enough for the soil to absorb without any surface run-off.
Regulates water through automation
- Microirrigation systems can be semi or fully automatic. It uses automatic controller, which can be simple mechanical clocks or timers that open or close the valve on a pre-set time schedule. These can be programmed to run at night when evaporation is low. A microirrigation system can be easily automated using electrical solenoid valves and a controller. This allows the system to operate at any time of the day and for any duration.
Reduces labour costs
- One of the major advantages of the microirrigation system is that it reduces labour costs. Labour requirement is reduced as it is an automated system and does not require labourers to irrigate an area. A large area of land can be irrigated at once with a microirrigation system.
Improves quality and yield
- Crop quality and yield is improved under the microirrigation system because of slow, regular and uniform application of water and nutrients.
- Besides, damages and losses due to the contact of water with fruits or foliages are practically eliminated.
Environmental Benefits
- Micro-irrigation reduces over-extraction of groundwater, minimises waterlogging, reduces fertiliser leaching and promotes sustainable water use.
Supports Climate-Resilient Agriculture
- Climate change is increasing rainfall uncertainty, droughts and heat stress. Micro-irrigation helps farmers adapt by using limited water more efficiently.
Reduces Soil Erosion and Runoff
- Unlike flood irrigation, micro-irrigation does not allow large volumes of water to flow across the field. This reduces runoff and soil erosion.
Helps in Water-Scarce and Drought-Prone Areas
- Micro-irrigation is highly useful in dryland, semi-arid and drought-prone regions. It allows limited water to be used more efficiently and supports agriculture even under water stress.
Reduces Input Cost
- Micro-irrigation can reduce expenditure on water, electricity, labour and fertilisers. In drip irrigation, fertigation allows fertilisers to be used more precisely, reducing wastage.
Supports “Per Drop More Crop”
- The central idea of micro-irrigation is to produce more agricultural output with less water. This directly supports the goal of “Per Drop More Crop”.

Challenges in Adoption of Micro-Irrigation

High Initial Cost
- Drip and sprinkler systems require pipes, pumps, filters, emitters, laterals and installation support. The initial cost can be high for small and marginal farmers.
- Even if subsidies are available, farmers may face difficulty in arranging upfront investment.
Small and Fragmented Landholdings
- Many Indian farmers have small and scattered plots. Installing and maintaining micro-irrigation systems becomes more difficult on fragmented land.
Lack of Awareness
- Many farmers are not fully aware of the benefits, operation and maintenance of micro-irrigation. Some may continue using traditional flood irrigation due to habit and familiarity.
Technical Maintenance Problems
- Drip emitters and sprinkler nozzles may get clogged due to sediments, salts or poor-quality water. Regular cleaning and maintenance are required.
- If after-sales service is weak, farmers may stop using the system.
Poor Quality Equipment
- Use of low-quality pipes, filters or emitters can reduce efficiency and durability. This creates mistrust among farmers.
Energy Dependence
- Sprinkler and drip systems often require pressure, pumps and reliable energy supply. Poor electricity supply may affect their use.
Limited Suitability for Some Crops
- Drip irrigation is highly suitable for horticulture, sugarcane, cotton and row crops, but it may not be equally suitable for all crops, especially where standing water is required.
Weak Integration with Crop Planning
- Micro-irrigation gives best results when combined with suitable crops, fertigation, soil testing and scientific irrigation scheduling. Without this integration, farmers may not get full benefits.

Way Forward

Make Micro-Irrigation Affordable
- Subsidies, easy credit and low-cost systems should be expanded for small and marginal farmers. Upfront cost should be reduced through DBT, credit linkage and community models.
Use FPO and Cooperative-Based Models
- FPOs, cooperatives and water user groups can help small farmers adopt micro-irrigation collectively. They can also support maintenance, training and purchase of quality equipment.
Strengthen Awareness and Training
- Farmers need practical training on installation, irrigation scheduling, fertigation, filter cleaning and maintenance of drip and sprinkler systems.
Ensure Quality and After-Sales Service
- Certified equipment, local repair centres and reliable after-sales support are necessary to build farmer confidence.
Link Micro-Irrigation with Crop Diversification
- Micro-irrigation should be promoted along with horticulture, pulses, oilseeds, vegetables and other less water-intensive crops.
Integrate with Watershed Development
- Micro-irrigation should be combined with rainwater harvesting, farm ponds, check dams, groundwater recharge and soil moisture conservation.
Promote Digital and Smart Irrigation
- Soil moisture sensors, automated drip systems, mobile advisories and weather-based irrigation scheduling can improve water-use efficiency further.
Focus on Water-Stressed Regions
- Priority should be given to areas facing groundwater depletion, drought-proneness and water scarcity.
Support Tenant and Women Farmers
- Micro-irrigation benefits should be accessible not only to landowners but also to tenant farmers, women farmers and smallholders through suitable institutional mechanisms.
Encourage Fertigation
- Farmers should be trained to use fertigation properly so that fertiliser-use efficiency improves and input costs decline.

Conclusion

Micro-irrigation is essential for making Indian agriculture water-efficient and sustainable. However, its success depends on affordability, farmer training, quality equipment, after-sales support, crop suitability and integration with watershed development. Wider adoption of drip and sprinkler irrigation can help India achieve the goal of “Per Drop More Crop” and build a more resilient agricultural system.

Sample UPSC Mains Questions

Q1. Micro-irrigation is essential for achieving the goal of “Per Drop More Crop” in Indian agriculture. Discuss.
(150 words, 10 marks)

Q2. Explain the advantages of drip and sprinkler irrigation in improving water-use efficiency and crop productivity.
(150 words, 10 marks)

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