Don Janssen: Trickly irrigation systems save water

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Trickle irrigation, called drip irrigation by some, can effectively water home gardens and ornamentals as well as use 30 percent to 50 percent less water than conventional overhead irrigation.

In a trickle system, water drips slowly out of small openings or emitters, from plastic tubing that has been laid on the ground or buried just beneath the soil surface. Besides saving water, other advantages include fewer weeds because only the soil around the desired plants is watered, easy operation, low pressure requirements, less potential for leaf diseases and uniform watering.

Disadvantages include the  cost — it is higher than conventional irrigation systems; the time required for initial installation; the possible plugging of the small openings with soil, algae or mineral precipitates; and insect and rodent damage.

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News and information

For reliable, research-based information, visit the UNL Extension in Lancaster County Web site at lancaster.unl.edu. The site is updated frequently. Features for today are:

-- The Lancaster County Fair is Aug. 6-10

-- Freezing Tomatoes with or without Skins

-- The Triangulate Household Spider

-- Volunteers Needed for the Lancaster County Fair

-- Know the Asthma Triggers in the Home

Composting hot line: 441-7139



5 Things To Do This Week

1. Prune out old fruiting canes of raspberries after harvest is complete.

2. Keep weeding. Prevent weeds from going to seed.

3. Keep newly established plants watered during dry weather.

4. Apply mulch around young plants to help conserve soil moisture and control weeds.

5. Remove faded blossoms from annual and perennial flowers to prevent seed formation.

The trickle system consists of a supply line either of hose, polyethylene pipe or polyvinyl chloride (PVC) pipe. This line lies perpendicular to the garden rows and delivers water to lateral lines. Laterals run down every other row and are made of polyethylene, butylene or PVC of 3/8 to 3/4-inch diameter. Emitters are either built into the laterals or attached separately.

The emitters reduce the line pressure to nearly zero and slowly apply drops of water to the soil. Emitters vary in type and sophistication, but generally all operate at pressures of 2 to10 pounds per square inch (psi) and supply 1/2 to 2 gallons of water per hour. There are six basic types of emitters: microtubes, long path, short-orifice, vortex, pressure compensating and line.

A pressure regulator, or reducer, will be required to lower the 20 to 60 (psi) household water pressure to 2 to15 psi. A fine screened filter (80 to 200 mesh) is also needed to remove any material from the water that might plug the emitters.

Trickle systems vary in sophistication. A complete kit can be purchased for small gardens while larger systems may require a detailed design and components purchased separately. System designs and kits for purchase can be found on the Internet.

Don Janssen is an Extension educator with the Lancaster County Extension of the University of Nebraska-Lincoln. He can be contacted by telephone at (402) 441-7180; by mail at 444 Cherrycreek Road, Lincoln NE 68528; or by e-mail at djanssen2@unl.edu.