Explanation

a) Specimen B is NPK or compound fertilizer; Specimen C is wood ash and Specimen D is animal dung.

(b) The observable physical properties of the specimens are:

Specimen B = NPK Higroscopic;

• The specimen is hard to touch, i.e; it is solid and strong.
• It is granular in nature and
• It is grey in colour and odourless.

Specimen C wood ash; 

• It is grey in colour.
• It is smooth and velvety to touch
• It is powdery in form
• It is dry and odourless.

Specimen D animal dung

• It is dark brown or black in colour
• lt has a bad odour. 
• it is bulky in nature.
• It is always sticky and soft in a fresh form.

(c) The major nutrients supplied by the specimen are:

• Specimen B = N, - P, -K,
• Specimen D = N, -P, -K.

(d) The methods of applying specimen C on the field are:

• It can be spread on the farm before ploughing.
• It can be put in holes, before planting
• It can be placed at the base of plant stem
• It can be allowed to be in rows before ridging

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