Abstract
Cation ratio of soil structural stability (CROSS) was used to evaluate the effects of potassium to calcium
and magnesium ratio in irrigation water on soil properties of a sandy loam. For this purpose, a research was
performed as a completely randomized design in undisturbed soil columns. Experimental factors were salinity (4
and 8 dS m-1
) and CROSS of irrigation water (10, 15, 20 and 25). After 16 weeks, water dispersible clay (DC),
saturated hydraulic conductivity (Ks), slope of retention curve at inflection point (S index), moisture content at field
capacity (FC), permanent wilting point (PWP) and plant available water content (PAWC) were measured. The
results showed that potassium ions in irrigation water significantly decreased DC, Ks, PAWC, and S index. The
effect of potassium on soil physical properties depended on the total concentration of solutes. According to the
results, it is suggested that the effects of potassium for assessing the soil structure should be considered.
Maasoume Zaker, Hojat Emami. (2019) Effect of potassium to bivalent cations ratio in irrigation water on some physical and hydraulic properties of sandy loam soil, The Journal Soil & Environment , Volume 38, Issue 1.
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