Drip irrigation delivers water directly to the root zone through a network of pipes and emitters, rather than flooding the field. The water saving compared with flood irrigation is substantial, and for many crops the yield improvement is larger than the saving.
It is also the farm investment most likely to be abandoned within two years — not because the technology fails, but because of maintenance decisions made at installation. This guide covers both sides honestly.
Which Crops Justify It
Drip pays back fastest on widely spaced, high-value crops:
- Excellent fit — sugarcane, cotton, banana, grapes, pomegranate, vegetables, papaya, tomato, chilli
- Workable — maize, groundnut, pulses on wide rows
- Poor fit — closely spaced broadcast cereals, transplanted paddy in most situations
The rule of thumb is spacing. The wider the plant spacing and the higher the crop value, the stronger the case.
What It Costs
Cost per acre varies widely with crop spacing, water source, land shape and the quality of components chosen. A wide-spaced orchard needs far less lateral pipe than a close-spaced vegetable crop, so quotes for the same acre can differ by a factor of two.
The system has three cost blocks:
- Head unit — pump connection, filters, valves, fertigation assembly. Fixed cost, does not scale much with area.
- Mainline and submain — buried PVC pipe carrying water across the field.
- Laterals and emitters — the pipes along each crop row. This scales directly with spacing.
Because the head unit is largely fixed, cost per acre falls as area increases. Very small plots carry a disproportionate share of that fixed cost.
Subsidies
Micro-irrigation is subsidised under central and state schemes, with a higher rate typically available to small and marginal farmers and to scheduled category farmers. Rates, ceilings and application procedures differ substantially between states, and the same scheme can be implemented differently in two neighbouring states.
Applications generally go through the state horticulture or agriculture department, often via an empanelled supplier. Two practical points: apply and get approval before installing, because retrospective claims are usually rejected, and use an empanelled supplier, because non-empanelled installations often do not qualify.
Check current rates with your district horticulture officer. Do not rely on figures quoted by a salesperson.
The Filter Is Not Optional
Emitters have very small openings. Anything in the water that can block them will block them. This is the single largest cause of abandoned drip systems.
- Sand or gravel filter — for pond, canal or open well water carrying organic matter
- Screen or disc filter — for borewell water carrying fine sediment
- Both in series — for dirty surface water
Farmers cutting the initial quote often remove the filter first because it looks like an accessory. It is the component the rest of the system depends on.
Maintenance That Actually Matters
Weekly
Clean the filter. Walk one or two laterals and look for wet patches or dry patches, which indicate leaks and blockages respectively.
Monthly
Open the far end of each lateral and flush it for a minute or two. Sediment accumulates at the ends first.
Each season
Acid treatment to clear mineral scale, and chlorination to clear biological slime, are standard practice where water quality demands it. Your supplier should specify concentrations and procedure for your water. Doing this at the wrong concentration damages the pipes, so get it in writing.
Common Mistakes
- Running the system too long. Drip is meant for frequent short applications. Running it like flood irrigation waterlogs the root zone and wastes the entire advantage.
- Ignoring pressure. Emitters are designed for a specific operating pressure. Too low and distant plants get nothing; too high and joints fail. Fit a pressure gauge and use it.
- Buying on price alone. Thin-walled laterals from unbranded suppliers save money at installation and fail within two seasons. Check that components carry ISI marking.
- Skipping the layout design. A sloping field needs pressure-compensating emitters. Installing standard emitters on a slope means the lower end floods while the upper end stays dry.
Fertigation
Once drip is installed, soluble fertiliser can be delivered through the same lines. This is where much of the yield gain comes from, because nutrients arrive at the root zone in small regular doses rather than in two or three large applications. It also cuts fertiliser quantity. Discuss a schedule with your KVK for your specific crop.
Before You Commit
Get three written quotes with an itemised component list, not a lump sum. Ask each supplier for the names of two farmers in your area running their system for more than three years, and go and see those fields. A system still working after three seasons tells you more than any brochure.
Subsidy rates and eligibility change and vary by state. Confirm current terms with your district horticulture or agriculture office before purchasing.