Evaluating the infiltration characteristics of furrow irrigation in a heavy textured soil
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Abstract A field experiment to evaluate the furrow Infiltration characteristics or a hcavy textured soil during the wetting front advance period was conducted during the dry season of 1988. Furrow of 80 m long at 1m spacing maintaining a gradual slope of 0.30% were constructed. Three different now sizes (30 Vmin, 60 1/min, and 120 1/min) formed the treatment variables. Measurements of stream flow section, running time, and advance of wetting front were determined. Wetting front advance, X data plotted against time, t yielded equation of the form X = a tb where a and b are parameters. Using the wcttcd pcrimctcr and average stream now cross section, open channel now was quantified. Based on furrow hydraulics and wetting front data, net Infiltration arca, Ain and the amount of water infiltrated, VI were calculated. Furrow infiltrate now, Qi was determined by differentiating the equations for VI and dividing Qi values over Ain yielded a generali7Æd equation for unit infiltration rate, qi of the form qi = 8.219 t-0.568 l/min/m2.
- Vol-1 1991