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Agricultural Science WAEC Past Questions

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226
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
View Answer & Discuss WAEC 1992
227
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
View Answer & Discuss WAEC 1992
228
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
View Answer & Discuss WAEC 1992
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229
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
View Answer & Discuss WAEC 1992
230
A soil with low PH value can be improved by the addition of
  • A. ammonium sulphate
  • B. calcium carbonate
  • C. sodium chloride
  • D. sodium nitrate
  • E. magnesium phosphate
View Answer & Discuss WAEC 1992
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