Discussion
__________ is the fraction of water entering the soil that must pass through the root zone in order to prevent soil salinity from exceeding a specified value.
Answer: A
The definition is that of the Leaching requirement.
Irrigation water always carries some salt. To stop it building up, part of the applied water must drain below the root zone and carry salts away. The leaching requirement is that fraction, usually estimated as
\[ LR = \frac{EC_{iw}}{EC_{dw}} \]
where \(EC_{iw}\) is the electrical conductivity of the irrigation water and \(EC_{dw}\) that of the drainage water allowed for the crop.
Irrigation potential is the area that can be irrigated, an irrigation cycle is the interval between irrigations, and perennial irrigation is year-round supply. None of them concerns salinity control.
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