JAMB and WAEC Agricultural Science questions: Soil fertility, manures and fertilisers

43 questions with answers and explanations. Tap an option to check yourself.

1. Question 1· Soil fertility, manures and fertilisers· JAMB

   Liming an acidic soil helps to

   • Aadd nitrogen
   • Blower the soil pH
   • Craise the soil pH
   • Dkill soil organisms

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2. Question 2· Soil fertility, manures and fertilisers· JAMB

   Repeated use of ammonium sulphate fertiliser tends to make the soil

   • Amore alkaline
   • Bmore acidic
   • Csaline
   • Dwaterlogged

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3. Question 3· Soil fertility, manures and fertilisers· WAEC

   Single superphosphate fertiliser supplies mainly

   • Apotassium
   • Bnitrogen
   • Cphosphorus
   • Dcalcium only

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4. Question 4· Soil fertility, manures and fertilisers· JAMB

   Bush fallowing restores soil fertility by

   • Acontinuous cropping
   • Badding chemical fertiliser
   • Cburning crop residues every year
   • Dletting natural vegetation add organic matter over time

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5. Question 5· Soil fertility, manures and fertilisers· WAEC

   Which nutrient do crops need in the largest amount for leafy growth?

   • Aphosphorus
   • Bnitrogen
   • Cpotassium
   • Dcalcium

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6. Question 6· Soil fertility, manures and fertilisers· WAEC

   Fertiliser placed in a ring round a tree crop such as cocoa is applied by

   • Afoliar spraying
   • Bbroadcasting
   • Cring application
   • Ddrilling with seed

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7. Question 7· Soil fertility, manures and fertilisers· WAEC

   In the nitrogen cycle, lightning helps to

   • Akill nitrifying bacteria
   • Bremove nitrogen from soil
   • Cmake soil acidic only
   • Dfix atmospheric nitrogen as oxides that rain brings to the soil

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8. Question 8· Soil fertility, manures and fertilisers· WAEC

   Organic manure includes

   • Afarmyard manure
   • Burea
   • CNPK
   • Dammonium sulphate

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9. Question 9· Soil fertility, manures and fertilisers· WAEC

   Farmyard manure improves soil by

   • Amaking it saline
   • Badding nutrients and improving structure
   • Ckilling earthworms
   • Dincreasing erosion

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10. Question 10· Soil fertility, manures and fertilisers· JAMB

    A bag of NPK 15:15:15 fertiliser contains

    • A15 kg of nitrogen only
    • Bnitrogen and phosphorus only
    • C15 different nutrients
    • Dequal percentages of nitrogen, phosphorus and potassium

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11. Question 11· Soil fertility, manures and fertilisers· JAMB

    Which of the following is an organic manure?

    • AUrea
    • BSingle superphosphate
    • CFarmyard manure
    • DMuriate of potash

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12. Question 12· Soil fertility, manures and fertilisers· WAEC

    Green manure is

    • Agreen plants ploughed into the soil while still fresh
    • Banimal dung
    • Ca chemical fertiliser
    • Dcompost made from refuse

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13. Question 13· Soil fertility, manures and fertilisers· JAMB

    Growing legumes in a rotation improves soil fertility because legumes

    • Ahave deep roots that loosen soil
    • Badd phosphorus to the soil
    • Cprevent all weeds
    • Dfix atmospheric nitrogen through bacteria in their root nodules

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14. Question 14· Soil fertility, manures and fertilisers· WAEC

    Soil fertility is reduced by

    • Acrop rotation
    • Bcontinuous cropping without fertiliser
    • Cmanuring
    • Dfallowing

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15. Question 15· Soil fertility, manures and fertilisers· JAMB

    Green manuring involves

    • Aapplying urea
    • Bspreading animal dung
    • Cploughing in a growing crop, usually a legume, to enrich the soil
    • Dburning crop residues

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16. Question 16· Soil fertility, manures and fertilisers· JAMB

    Compost is made by

    • Aallowing plant and animal wastes to decompose in a heap or pit
    • Bmixing fertilisers with sand
    • Cburning crop residues
    • Ddrying animal dung in the sun

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17. Question 17· Soil fertility, manures and fertilisers· JAMB

    Placing fertiliser in a band beside the crop row is

    • Afoliar application
    • Bbroadcasting
    • Cside placement
    • Dtop dressing by air

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18. Question 18· Soil fertility, manures and fertilisers· JAMB

    Applying too much nitrogen fertiliser to maize can cause

    • Aseed dormancy
    • Bearly maturity always
    • Cno growth
    • Dlodging and excessive leafy growth

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19. Question 19· Soil fertility, manures and fertilisers· WAEC

    The bacteria in the root nodules of legumes that fix nitrogen belong to the genus

    • AClostridium
    • BNitrosomonas
    • CRhizobium
    • DPseudomonas

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20. Question 20· Soil fertility, manures and fertilisers· JAMB

    The nutrient mostly responsible for vigorous leafy, green growth in crops is

    • Anitrogen
    • Bpotassium
    • Cphosphorus
    • Dcalcium

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    Explanation and discussion