THE PULSED IRRIGATION PRINCIPLE FOR CONTROLLED SOIL WETTING

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Abstract
The pulsed water application principle was developed in order to obtain the desired low application rates from any water emitter. A time averaged hourly water application rate was used to define the pulsed water application regime. In a series of controlled laboratory experiments water was applied to soil columns at various combinations of nominal application rates, Ri, and pulse duration, tp. The volumetric soil water content distribution and the rate of advance of the wetting front in the soil columns behaved as if the time averaged water application rate was being applied continuously. The water pulses applied at the soil surface are quickly damped, resulting in an essentially constant water flow through the wetted soil profile. The pulsed water application principle can be used effectively to control the wetting of the soil profile during the infiltration process.

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