University of Khartoum

Horizontal Infiltration of Water In Soil Columnsas Affected by A Gel-Forming Conditioner

Horizontal Infiltration of Water In Soil Columnsas Affected by A Gel-Forming Conditioner

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Title: Horizontal Infiltration of Water In Soil Columnsas Affected by A Gel-Forming Conditioner
Author: Mustafa, M. A.; AlOmran, A. M.; Shalaby, A. S.; Aldarby, A. M.
Abstract: We conducted a laboratory experiment on the interrelationships among five rates, R (0 to 1.6%), of a gel-forming conditioner (Jalma—containing 24.5% humic acids and 3.8% polysaccharides), water pene¬trability (A), weighted-mean diffusivity (.b), swelling index (5), and effective mean pore radius (t) of a loamy sand, a sandy loam, and a loam. For each of the three soils, the results indicated a highly signif¬icant linear increase in S and a consequent exponential decrease in t, A, and D with increase of R. The effects of Jalma on these parameters were more marked on the loamy sand than on the other two soil sam¬ples. Addition of 0.2, 0.4, 0.8, and 1.6% Jalma to the loamy sand sample significantly re¬duced A by about 19, 55, 83, and 98%, respectively, and b by about 38, 76, 96, and 100%, respectiely. The highest rate almost completely sealed the soil independ¬ent of its texture and reduced D to almost zero. We concluded that 0.4% Jalma is the optimum rate for soil water conservation. We argue that Jalma addition causes swell¬ing of the soil matrix, reduces the effective mean pore radius, and consequently re¬duces A and D. The effective mean pore radius proved to be a reliable predictor of .D and A of the soil samples studied inde¬pendent of their texture: A = 2.548t°• (r2 = 0.960), and D = 3.303x`.076 (r2= 0.958).
URI: http://khartoumspace.uofk.edu/123456789/22367


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