COLLEGE OF AGRICULTURE
ASSAM AGRICULTURAL UNIVERSITY,JORHAT
DEPARTMENT OF HORTICULTURE
Drip irrigation is a micro irrigation method in which
the rate of water application is very low and without
any pressure. i.e., drop by drop
Drip irrigation is based on the basic concept of
irrigation only the roots zone of crop , rather than the
entire land surface on which the crop is grown.
Water flows from the emission
points through the soil by
capillarity and gravity.
The soil moisture content of the
crop root zone is maintain at near
optimum level to facilate optimum
crop growth and production.
DRIP IRRIGATION IS USEFUL FOR FRUIT
Banana, Grapes, Citrus, Pomegranate,
Papaya, Pineapple, Watermelon, Sweet lime,
Mango, Kinnow, Mosambi.
ADVANTAGES OF DRIP IRRIGATION IN
Increased fertilizer use efficiency by crop
Marginal land & undulated land can be irrigated
Use of saline water is possible for irrigation
Reduced weed growth
Less problem of disease and pest
Easy intercultural operations
DISADVANTAGES OF DRIP IRRIGATION
High cost :
drip irrigation systems are expensive because of there requirements of
large quantity of piping & filtration equipment to clean the water.
Initial cost can be more than overhead systems.
The sun can affect the tubes used for drip irrigation, shortening their
usable life. Longevity is variable.
If the water is not properly filtered and the equipment not properly
maintained, it can result in clogging.
Drip tape causes extra cleanup costs after harvest. You'll need to plan for drip
tape winding, disposal, recycling or reuse.
This method is not suitable for closely planted crops such as wheat
Drip method Flood method
between 40 and 100 %
Less. High rates of
evaporation, surface run off
Irrigation efficiency 80 – 90 % 30 - 50 %
Weed problem Almost nil High
Even saline water can be
Only normal water can be
Diseases and pests Relatively less High
Efficiency of fertilizer use
Very high since supply is
Heavy losses due to
Drip method Flood method
Water logging Nil High
Can be regulated easily Not much control
Cost benefit ratio (additional
amount in rupees for every
Excluding water savings: 1.3 -
13.3, Including water
savings: 2.8 - 30.0
Between 1.8 and 3.9
Capital cost/ha Rs 15,000 to 40, 000
on crop spacing
20 - 100 % higher than flood
Less compared to drip
COMPONENTS OF DRIP IRRIGATION
To create a pressure about 2.5
Kg/sq cm to regulate the
amount of water to be
• Filter :
To filter the water in
Order to remove the
It is a Distribution system in drip
irrigation. Rigid PVC and high density
polyethylene pipes are used as main
pipes to minimized corrosion and
Pipes of 65 mm diameter and with
pressure rating of 4 to 10 kg/sq. cm
It is usually connected to the main lines
through a control valve assembly.
The function of its to distributes water
uniformly to a number laterals.
It is fitted to a drip irrigation
lateral and intended to emit water
in the form of drops or continuous
flow at emitter rates not exceeding
Drippers function as energy
dissipated, reducing the inlet
pressure head in the lateral, which
generally range from 0.3 to 1.5
More than 70% of Indian
farmers are small scale
operators cultivating plots
less than one hectare. Irratic
rainfall pattern play havoc
into the livelihoods of the
small farmers who do not
have any alternate supply of
BENEFITS TO FARMERS :
• Drip irrigation system is an economical and very
efficient system of irrigating for fruit crops,
vegetables, row crops etc.
• Drip irrigated crops use less water compared to
overhead irrigated crops.
• Drip irrigation increase yield.