Agricultural Officer Practice Quiz

Question 1

Which pH range is generally considered most favorable for the availability of most essential plant nutrients in mineral agricultural soils?

Accepted Answer

pH 5.5-7.0

Question 2

The primary purpose of applying agricultural lime to an acid soil is to:

Accepted Answer

Neutralize soil acidity and raise soil pH

Question 3

A soil test recommends 4 t/ha of pure CaCO3 equivalent to reach the target pH. If the farmer uses a liming material with 80% effective calcium carbonate equivalent (ECCE), what application rate is required?

Accepted Answer

5.0 t/ha

Question 4

Which sequence best describes the chemical effect of CaCO3 when applied to an acid soil?

Accepted Answer

CaCO3 supplies CO3 2- or HCO3- that consumes H+, while Ca2+ replaces acidic cations on exchange sites

Question 5

Why does exchangeable aluminum become a major concern in strongly acid soils?

Accepted Answer

Because soluble and exchangeable Al increases at low pH and can injure roots

Agricultural Officer Mock Test

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