Percentage Water Content of Soil Sample (Leaving Cert Agricultural Science): Flashcards

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Percentage Water Content of Soil Sample
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Method for measuring soil water content

Gravimetric method

Oven temperature for drying soil samples

105°C

Duration for drying soil samples in oven

24 hours

Purpose of desiccator

Prevents moisture reabsorption during cooling

Soil water content % formula

(WM−WD)(WD−WE)×100\frac{(W_M - W_D)}{(W_D - W_E)} \times 100

WMW_M in the formula

Weight of crucible + moist soil

WDW_D in the formula

Weight of crucible + dry soil

WEW_E in the formula

Weight of empty crucible

Why 105°C is used for drying soil

Removes water without decomposing organic matter

Effect of incomplete drying on results

Underestimates water content

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