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  • The determination of field capacity is variable and multiple methods to do so exist. Even in a given soil, the value of field capacity is variable, but serves as a useful measure of its water-holding capacity. Field capacity is often characterized by measuring water content after wetting a soil profile, covering it (to prevent evaporation) and monitoring the change soil moisture in the profile. Water content when the rate of change is relatively small is indicative of when drainage ceases and is called field capacity, it is also termed drained upper limit (DUL). This measure of field capacity is well-correlated with field capacity determined by applying −33 kPa (or −0.33 bar) of hydraulic head or suction pressure (less in sandy soils) to a portion of soil and subsequently measuring the bulk water content it retains.Field capacity is usually naturally arrived at 2–3 days after rain or irrigation in pervious soils of uniform structure and texture.
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