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1994 WAEC Agricultural Science Practical (a) ldentify specimens A, B, and C.        (b) State the main nutrient(s)...

Agricultural Science
WAEC 1994

(a) ldentify specimens A, B, and C.

Top Quality Npk Fertilizers   Ammonium Sulfate | Aluminum Sulfate | Aluminum Manufacturers   Lime Citrus, varieties, production, seasonality | Libertyprim

(b) State the main nutrient(s) which can be released to the soil for crop's use by each of specimens A, B, and C.

(c) Name two other chemical substances which can be used as substitutes for specimen B

(d) State the major adverse effect of repeated applications of specimen B on a soil

(e) Mention the role of specimen C in;
(i) crop production,
(ii) fish production.

(f) Name other substances that can be used and Substituted for specimen C
 

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Explanation

a) ldentiflcation of specimens;

  • A - NPK fertilizer,
  • B - Ammonium Sulphate,
  • C - Lime

(b) The man nutrient(s) released by each specimen are:

  • Specimen A - Nitrogen, phosphorus and potassium,
  • Specimen B - Nitrogen
  • Specimen C -  Calcium,

(c) Ammonium Nitrate and urea can be used as substitutes for specimen B.

(d) it can increase the acidity of the soil

(e)(i) Role of specimen C in crop production ars,

  • it helps to reduce soil acidity
  • It increases the activities of soil living organisms,
  • It improves the soil structure.
  • It increases water percolation in soils.

(il) Role of Specimen C in fish production are.

  • It serves as additional source of calcium for bone development in fish.
  • It reduces turbidity in the fish ponds through flocculation,

(f) (i) Quick lime (ii) Slaked lime (iii) Basic Slag (iv) Dolomite (v) Calcium carbonate,

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