Social Science
Literature Arabic Islamic Studies C.R.KHistory MusicVisual Art Clothing/Textile Home Management Shorthand
Agricultural Science Paper 1, May/June 2008  
Questions:   1 2 3 4   Main
General Comments

Question 1

  • What class of manure does each of specimen A and B belong to


  • List three characteristics of each of specimens A and B


  • List two precautions to be observed when applying each of specimens A and


  • List two precautions to be observed when applying each of specimens A and B.


  • State which of the specimens is recommended to improve clay soil.

              Give two reasons for your answer.                                                     [3 marks]

  • This question was fairly attempted by the candidates. In 1 (a), most of the candidates were able to name the class of manure to which specimens A (Poultry droppings) and B (NPK 15-15-15) belong. However, in l(b), majority of the candidates were unable to list the characteristics of specimens A and B. Also, many candidates could not list the precautions to be taken when applying each of specimens A and B as demanded in 1 ( c).
  • Characteristics of:
  • Specimen A (Poultry droppings) It is bulky
  • Rich in micro-organisms
  • Contains many plant nutrients/improves soil fertility the nutrients concentration are fairly low
  • Capable of binding soil particles together/improves soil structure has a bad smell
  • Improves soil temperature
  • . It is structure less/amorphous Tends to be neutral in reaction Low availability of nutrients
  • Nutrients not easily leached/lasts longer in the soil Reduces soil erosion by improving soil structure Variable nutrient concentration
  • Specimen B (N-P-K 15 -15-15) Granular in structure Has pungent smell
  • Contains only few mineral nutrients
  • The concentrations of these nutrients are very high The nutrients are fixed in definite proportion
  • Not bulky in nature
  • Does not reduce soil erosion Nutrients are readily available Hygroscopic
  • Easily leached; does not last long in the soil


    • Precautions to take when applying
    • Specimen A (Poultry droppings)
    • Should not be applied when fresh to crops on the field Must not be allowed to touch the plants
    • Should cure properly before application/fully decomposed before applying Wash hands immediately after application
    • Wear protective clothing
    • Should be applied when soil is wet
    • Specimen B (N-P-K 15 -15-15)
    • Do not allow direct contact with the plant Do not apply when the soil is very dry
    • When applying manually always wear gloves Wash hands immediately after application Do not apply to alkaline soils
    • . Do not eat, drink or smoke when applying the fertilizers Do soil test to know deficient nutrient before applying
    • Also in l(d), most of the candidates could not state which of the specimens (A or B) would be recommended to improve clay soil and give reasons.
    • The extended answers are specimen A
    • Reasons:
    • It binds clayey particles together thus opening up/enlarging the pores
    • It improves water percolation
    • It improves aeration
    • It improves soil fertility
    • . It improves soil drainage
    • It will improve soil temperature in clay soils
    • It will enhance the release of locked nutrients and make them more available
Powered by Sidmach Technologies(Nigeria) Limited .
Copyright © 2012 The West African Examinations Council. All rights reserved.