Question 441:

• WAEC 1992

The effect of clearing agricultural lands clean of all vegetation and or trees include the following except

A. Exposure of soil to erosion
B. Compaction of soil
C. Desertification
D. Complete removal of soil nutrients
E. Exposure of subsoil

Question 442:

• WAEC 1992

Which of the following is not an advantage of drip-irrigation?

A. Fertilizers can be applied through the system
B. There is reduction in the concentration of salt in the root zone
C. The system operates on a much lower line pressure than spinkler system
D. Its efficiency on water distribution in steep slopes is poor
E. There is considerable maximization on use of water

Question 443:

• WAEC 1992

Chlorosis observed along the veins of leaves is a characteristic symptom for the deficiency of

A. Nitrogen
B. Magnesium
C. Potassium
D. Phosphorus
E. Sulphur

Question 444:

• WAEC 1992

The removal of excess water from the soil surface and the upper subsoil is known as

A. Irrigation
B. Drainage
C. Evaporation
D. Surface turn-off
E. Dehydration

Question 445:

• WAEC 1992

Which of the following is not an effect of manuring on the soil?

A. Adding plant nutrients to the soil
B. Releasing adequate plant nutrients of the appropriate time
C. Facilitating soil aeration and movement of soil moisture
D. Enhancing the activities of soil microorganisms
E. Improving the structure of the soil