A soil sample has the following properties: sand 40 %, silt 35 %, clay 25 %, organic matter 3 %, pH 6.5, bulk density 1.4 g cm⁻³, wilting point water content 12 % (by weight) and saturation water content 30 % (by weight).

(a) Identify the soil texture class using the USDA triangle.
(b) Estimate the field capacity, assuming it is approximately midway between wilting point and saturation.
(c) Based on the texture and pH, state whether the soil is suitable for growing maize and give a brief justification.

Question

A soil sample has the following properties: sand 40 %, silt 35 %, clay 25 %, organic matter 3 %, pH 6.5, bulk density 1.4 g cm⁻³, wilting point water content 12 % (by weight) and saturation water content 30 % (by weight).

(a) Identify the soil texture class using the USDA triangle.
(b) Estimate the field capacity, assuming it is approximately midway between wilting point and saturation.
(c) Based on the texture and pH, state whether the soil is suitable for growing maize and give a brief justification.

Accepted Answer

a) Loam; b) 21 % (by weight); c) Suitable for maize - loam texture, pH 6.5 and adequate field capacity.

Neco Model Questions Vol1 2019 Geography Question 3

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