Modelling The Impact Of Pulsing Of Drip
Irrigation On The Water And Salinity Dynamics
In Soil In Relation To Water Uptake By An
Almond Tree
Author(s)
V. Phogat, M. A. Skewes, J. W. Cox & M. Mahadevan
Abstract
Pulsing is the application of daily irrigation in a phased manner involving one
hour irrigation and one hour off. A field experiment was conducted involving
pulsed and continuous irrigation to almonds through surface drip during 2009–
10, and water applications and moisture distribution in the soil were monitored
throughout the season. A finite element numerical model (HYDRUS 2D) was
used to evaluate the impact of pulsed application of irrigation on water balance
and salinity distribution in the soil. The modelled values of moisture content
matched well with the weekly measured neutron probe values at all soil depths
(10 cm to 160 cm) with RMSE of mean values varying from 0.01 to 0.08 and
0.01 to 0.05 in pulsing (Ip) and continuous (Ic) treatments respectively. The
simulated seasonal water uptake was slightly higher (25 mm) in pulsing than
continuous irrigation, whereas the soil storage was slightly higher (20 mm) under
continuous irrigation. The leaching fraction amounts to 0.25 in both treatments
and was higher during August and March-April because the water requirement of
almond early in the growing season and after harvest remained relatively low.
The salinity distribution was similar in both treatments and simulated average
salinity of soil solution varied from 0.47 to 3.38 dS/m and 0.49 to 3.67 dS/m in
Ip and Ic treatments respectively. Hence the modelling simulations revealed that
pulsed irrigation at higher discharge rate (3.87 l/h) produced similar water and
salinity distribution in the soil as obtained in low discharge (2 l/h) continuous
Keywords
modelling, pulsing, almond, drip irrigation, moisture content, salinity, water uptake, leaching, HYDRUS 2D
Related Book
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