In a soil study the available water capacity (AWC) is found to be directly proportional to the clay percentage of the soil. Soil A contains 20 % clay and has an AWC of 0.15 cm³ cm⁻³. Soil B contains 50 % clay and has a wilting point of 0.12 cm³ cm⁻³.

(a) Determine the field capacity of Soil B.

(b) Verify that the calculated field capacity does not exceed the theoretical porosity of Soil B, given its bulk density is 1.30 g cm⁻³ and the particle density of mineral matter is 2.65 g cm⁻³.

Question

In a soil study the available water capacity (AWC) is found to be directly proportional to the clay percentage of the soil. Soil A contains 20 % clay and has an AWC of 0.15 cm³ cm⁻³. Soil B contains 50 % clay and has a wilting point of 0.12 cm³ cm⁻³.

(a) Determine the field capacity of Soil B.

(b) Verify that the calculated field capacity does not exceed the theoretical porosity of Soil B, given its bulk density is 1.30 g cm⁻³ and the particle density of mineral matter is 2.65 g cm⁻³.

Accepted Answer

0.495 cm³ cm⁻³ (≈0.50 cm³ cm⁻³)

Neco 2018 Geography Question 32

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