(a) Study specimen E (NPK 15:15:15), F (WOOD ASH), G (LIMESTONE), and H (COWDUNG) and answer the following questions. (i) State three major nutrients suppli...

(a) Specimen E (NPK 15:15:15):

• (i) Three major nutrients supplied to crops: Nitrogen (N), Phosphorus (P) and Potassium (K).
• (ii) Three methods of applying specimen E on a farm:
  • Broadcasting (spreading evenly over the field).
  • Band placement/side dressing (placing beside the rows or plants).
  • Ring/spot application (placing around each plant).

(b) Three agricultural uses of each of specimens F and G:

Specimen F (wood ash):

• Used to supply potassium (potash) to the soil.
• Used to reduce soil acidity (as a liming material).
• Used to control storage pests of grains and legumes.

Specimen G (limestone):

• Used to reduce soil acidity (raise soil pH) - liming.
• Supplies calcium and magnesium to the soil.
• Improves soil structure and the activity of soil micro-organisms.

(c) Three ways in which specimen H (cow dung) is important to the soil:

• It adds plant nutrients and improves soil fertility.
• It increases the organic matter/humus content and improves soil structure.
• It improves the water-holding capacity and aeration of the soil and feeds soil organisms.