عنوان

Accounting for potassium and magnesium in irrigation water quality assessment

Number

LA4c1921nm

.Language of Text, Soundtrack etc

انگلیسی

Title Proper

Accounting for potassium and magnesium in irrigation water quality assessment

General Material Designation

[Article]

First Statement of Responsibility

Oster, J D; Sposito, Garrison; Smith, Chris J

Text of Note

Irrigation with treated wastewater is expected to increase significantly in California during the coming decade as a way to reduce the impact of drought and mitigate water transfer issues. To ensure that such wastewater reuse does not result in unacceptable impacts on soil permeability, water quality guidelines must effectively address sodicity hazard. However, current guidelines are based on the sodium adsorption ratio (SAR) and thus assume that potassium (K) and magnesium (Mg), which often are at elevated concentrations in recycled wastewaters, pose no hazard, despite many past studies to the contrary. Recent research has established that the negative effects of high K and Mg concentrations on soil permeability are substantial and that they can be accounted for by a new irrigation water quality parameter, the cation ratio of structural stability (CROSS), a generalization of SAR. We show that CROSS, when suitably optimized, correlates strongly with a standard measure of soil permeability reduction for an agricultural soil leached with winery wastewater, and that it can be incorporated directly into existing irrigation water quality guidelines by replacing SAR.

Date of Publication

2016

Title

California Agriculture

Volume Number

70/2

Entry Element

Oster, J D; Sposito, Garrison; Smith, Chris J

Electronic name

[Article]

275578

a

Y