Irrigated and rainfed farming: protective, productive, dryland and wetland

Detail

1. The basic split: where does the crop get its water?

• Farming in India is classified by its main source of moisture (the water that reaches the crop's roots).
• Irrigated farming: people bring water to the field through canals, wells, tubewells or tanks.

• Rainfed farming (barani): the crop depends only on rain. Barani is the local word for rain-dependent land in north-west India.

• Each type is split again:

• Irrigated farming is split by purpose: protective or productive.
• Rainfed farming is split by how much moisture the soil holds: dryland or wetland.

Main type	Sub-type	Basis of the split	Key idea
Irrigated	Protective	Purpose of irrigation	Save the crop from drought
Irrigated	Productive	Purpose of irrigation	Get the highest yield
Rainfed	Dryland	Soil moisture (under 75 cm rain)	Grow hardy crops and save every drop
Rainfed	Wetland	Soil moisture (rain is more than crops need)	Grow water-hungry crops and manage floods

2. Irrigated farming: protective vs productive

• Irrigated farming: farming where crops get water from canals, wells, tubewells or tanks, on top of any rain.
• The sources of irrigation and where each one is used across India are covered in the water-resources note.

Protective irrigation

• Definition: irrigation that adds to rainfall so the crop does not die from a moisture deficiency (too little water in the soil).
• Logic: there is little water, so it is spread thinly over the largest possible area. Many farmers get a little water rather than a few farmers getting a lot.
• Where it is used: dry, drought-prone areas.
• Examples:
• Stage I of the Indira Gandhi Canal (Rajasthan) was planned as protective irrigation for the Thar desert area.

• The PMKSY slogan "Har Khet Ko Pani" ("water to every field") follows the same idea.

• PMKSY (Pradhan Mantri Krishi Sinchayee Yojana): an umbrella scheme with two major components:

• AIBP (Accelerated Irrigation Benefit Programme)
• Har Khet Ko Pani (HKKP), which has four sub-components [6]:
  • Command Area Development & Water Management (CAD&WM)
  • Surface Minor Irrigation
  • Repair, Renovation and Restoration (RRR) of water bodies
  • Ground Water Development

Productive irrigation

• Definition: irrigation that gives enough water through the whole cropping season to get high productivity (high yield per hectare).
• Logic: it uses more water per unit area than protective irrigation.
• Example: Green Revolution Punjab (from the late 1960s). Its HYV (high-yielding variety) wheat and rice need regular, assured water, which canals and tubewells supplied.
• Chain of effects:
• Assured water → farmers can use HYV seeds and fertiliser → yields rise sharply.
• Heavy water use → groundwater is pumped faster than rain refills it → water tables fall in Punjab and Haryana.

Feature	Protective irrigation	Productive irrigation
Aim	Prevent crop failure	Maximise yield
Water per hectare	Low	High
Area covered	As wide as possible	Smaller, intensively watered
Typical region	Arid and semi-arid (e.g. western Rajasthan)	Fertile plains (e.g. Punjab, Haryana)
Example	Indira Gandhi Canal Stage I; "Har Khet Ko Pani"	Green Revolution Punjab

3. Rainfed farming: dryland vs wetland

• Rainfed farming: farming that depends only on rain, with no planned irrigation.

Dryland farming

• Definition: rainfed farming mainly in areas with less than 75 cm of annual rainfall.
• Where: western Rajasthan, Gujarat (Kachchh and Saurashtra), the rain-shadow interior of Maharashtra and Karnataka (east of the Western Ghats), and Telangana and Andhra Pradesh (Rayalaseema).
• Crops: hardy, drought-resistant crops such as ragi, bajra, moong, gram and guar (grown for fodder).
• Methods:
• Soil-moisture conservation, such as mulching (covering the soil to slow drying), bunding (low earth walls around fields) and deep ploughing.

• Rainwater harvesting, which means catching rain and storing it in ponds, tanks or the soil.

• Exam trap: sugarcane is NOT a dryland crop. It needs a great deal of water.

Wetland farming

• Definition: rainfed farming where the rainy-season rain is more than the crops need.
• Where: high-rainfall areas such as Assam, West Bengal, coastal Odisha, the west coast (Konkan, Kerala) and the north-eastern states.
• Crops: water-intensive rice, jute and sugarcane, plus freshwater aquaculture (fish farming in ponds and tanks).
• Hazards: floods and soil erosion (topsoil washed away by heavy rain and runoff).

Feature	Dryland farming	Wetland farming
Rainfall	Under 75 cm a year	More than the crop needs in the rainy season
Main problem	Too little water and drought	Too much water, floods and erosion
Crops	Ragi, bajra, moong, gram, guar	Rice, jute, sugarcane, freshwater fish
Key practice	Moisture conservation and rainwater harvesting	Drainage and flood management

4. How large and important is rainfed farming?

• Share of land:
• Rainfed agriculture covers nearly 60% of net sown area and gives about 40% of total food production [2].
• Land-use data for 2018-19 show net un-irrigated area at about 48.65% of net sown area. So about 51% was irrigated [3].

• The two figures differ because they use different measures. In both, roughly half or more of India's farmland is rain-dependent.

• Crops: rainfed land grows most of India's pulses, millets, oilseeds and cotton.

• Policy body: the National Rainfed Area Authority (NRAA).
• It was set up by an order of 3 November 2006 and began work with its first Governing Board meeting on 12 February 2007 in New Delhi [4].
• It is an expert body that gives knowledge inputs for upgrading and managing dryland and rainfed agriculture [4].

• It has two tiers [4]:

  • a Governing Board, chaired by the Union Agriculture Minister and co-chaired by the Union Rural Development Minister;
  • an Executive Committee of technical experts and ministry representatives.

• Watershed programmes support this work. A watershed is the whole area that drains into one stream. Treating it as one unit means using check dams, contour bunds and tree planting to hold rainwater in the soil.

5. Old roots: India's irrigation heritage

• Rain-fed farmers have long coped with droughts and erratic monsoons (rain that comes late, stops early or falls unevenly). They do this through drought-resistant crops and traditional water harvesting.
• Irrigation in India is very old. Each region has its own words for its water structures:

• kul, kund, ahar, pokhar, khadin, arakere, kolam, surangam, tadagam, eri

• Named examples:

Structure	What it is	Where	When / who
Phad	Community-run canals that divert river water to fields	Maharashtra	Traditional
Bamboo drip irrigation	Bamboo pipes carry stream water downhill, drop by drop	North-east India	Traditional
Kallanai (Grand Anicut)	Stone dam across the river	Kaveri river, Tamil Nadu	Built by Karikala (Chola king), about 1,800 years ago
Munsar lake	Large man-made water lake	Viramgam, Gujarat	11th century

6. Modern trends: water saving and wider coverage

• Why micro-irrigation is needed:
• Groundwater use is rising → water tables are falling → water must be used more carefully.
• Drip irrigation delivers water drop by drop at the plant's roots.
• Sprinkler irrigation sprays water like rain.

• Both waste much less water than flooding the whole field.

• Per Drop More Crop (PDMC), the micro-irrigation part of PMKSY, covered 61.72 lakh hectares from 2016 to 2022 [5].

• Irrigation coverage today:
• Irrigated area rose from 49.3% to 55% of gross cropped area between FY16 and FY21 (Economic Survey 2024-25) [7].
• Net irrigated area was about 51% of net sown area in 2018-19 [3].
• (NCERT: irrigation covers about 33% of the cultivated area.)

Prelims Hooks

• Dryland farming is mainly found where annual rainfall is below 75 cm.
• Sugarcane is not a dryland crop. It belongs to wetland farming with rice and jute. Ragi, bajra, moong, gram and guar are dryland crops.
• Protective irrigation spreads limited water over the largest area. Productive irrigation gives more water per hectare for high yield.
• Indira Gandhi Canal Stage I is an example of protective irrigation. Green Revolution Punjab is an example of productive irrigation.
• Kallanai (Grand Anicut): on the Kaveri, built by Karikala (Chola), about 1,800 years ago.
• Munsar lake: Viramgam, Gujarat, from the 11th century. Phad: Maharashtra. Bamboo drip: north-east India.
• NRAA: set up by an order of 3 November 2006 and chaired by the Union Agriculture Minister [4].
• Har Khet Ko Pani is a component of PMKSY, alongside AIBP [6].
• Rainfed agriculture covers nearly 60% of net sown area and gives about 40% of food production [2].
• Irrigation coverage rose from 49.3% to 55% of gross cropped area (FY16 to FY21) [7]. (NCERT: about 33%.)

Mains Points

• Rainfed areas are the key to food and nutrition security (GS-III):
• They cover nearly 60% of net sown area [2] and grow most of India's pulses, millets, oilseeds and cotton.
• So imports of edible oil and pulses depend on how well rainfed farms do.

• Policy answers include the NRAA (2006) [4], watershed development and PMKSY's "Har Khet Ko Pani" [6].

• Productive vs protective irrigation is a choice between more yield and fairer sharing of water:

• Productive irrigation (Punjab model) → high yields but falling water tables, waterlogging and salinity.
• Protective irrigation → water spread to more farmers and lower drought risk in arid areas.

• The argument: India should move from flood irrigation to micro-irrigation (PDMC: 61.72 lakh ha, 2016-22 [5]).

• Two hazard profiles need different region-specific strategies (GS-I/III):

• Dryland areas (under 75 cm rain) face drought and need moisture conservation, rainwater harvesting and drought-hardy crops.

• Wetland areas (Assam, West Bengal, coastal Odisha) face floods and soil erosion and need drainage, embankments and flood-tolerant rice varieties.

• Traditional systems are a living model for climate adaptation:

• Kallanai (about 1,800 years old), phad, khadin, ahar-pyne and eri tanks show community-managed, low-cost water harvesting.
• Reviving them through RRR of water bodies under HKKP [6] links heritage to water security.