(a) What class of manure do each of specimens A (POULTRY DROPPINGS) and B (N-P-K 15-15-15) belong to? [2 marks] (b) List three characteristics of each of sp...

Answer Details

(a) Class of manure

• Specimen A (poultry droppings): organic manure (animal manure).
• Specimen B (N-P-K 15-15-15): inorganic or chemical fertilizer (a compound fertilizer).

(b) Three characteristics of each specimen

Specimen A (poultry droppings)

1. It is bulky and low in nutrient concentration.
2. It contains organic matter and adds humus to the soil.
3. It releases its nutrients slowly and has an offensive smell.

Specimen B (N-P-K 15-15-15)

1. It is concentrated and high in plant nutrients (15% N, 15% P, 15% K).
2. It is not bulky and dissolves readily, so nutrients are quickly available.
3. It is manufactured and does not add humus to the soil.

(c) Two precautions when applying each specimen

Specimen A

1. It should be well decomposed (cured) before application to avoid scorching and weed seeds.
2. It should be worked into the soil and hands washed after handling.

Specimen B

1. Apply only the recommended rate and keep it away from the plant base to avoid scorching the crop.
2. Store in a dry place and wear protective gloves to avoid contact with the skin.

(d) Specimen recommended to improve clay soil

Specimen A (poultry droppings) is recommended. Reasons:

1. It adds organic matter and humus that improve the structure, aeration and drainage of the heavy clay soil.
2. It encourages the activity of soil organisms and binds particles into crumbs, whereas Specimen B only supplies nutrients and does not improve the soil's physical condition.