The horizon of soil profile which encourages the greatest level of microbial activity is

A. A-horizon

B. B-horizon

C. C-horizon

D. D-horizon

The easiest method of determining soil texture in the field is by

A. moulding

B. sieving

C. feeling

D. sedimenting

The type of soil with a particle size of 0.02 to 0.002 mm is

A. clay

B. silt

C. fine sand

D. coarse sand

If urea fertilizer contains 46% nitrogen. calculate the amount of nitrogen in 25 kg bag of fertilizer?

A. 11.5 kg

B. 13.5 kg

C. 21.5 kg

D. 36.5 kg

Fertile soil is one which

A. is easily drained

B. is well aerated

C. can produce a good harvest of cowpea

D. contains all essential plant nutrients in suitable proportions

The effects of practicing crop rotation include the following except

A. maintaining and improving soil fertility

B. controlling soil erosion

C. preventing the build-up of pests and diseases

D. adding humus to the soil

The method of irrigation suitable for use on a steep slope is

A. sprinkler irrigation

B. flood

C. furrow irrigation

D. shadoof

The main source of power for subsistence equipment is

A. animal

B. machine

C. electricity

D. man

The most suitable source of power for stationary equipment on a farm is

A. machine

B. electricity

C. animal

D. man

An important farm machine used for coupling many implements is

A. disc horrow

B. harvester

C. tractor

D. plough