Explanation

a (i), Major nutrients supplied by specimen E (NPK 15:15:15) -

• Nitrogen
• Phosphorus
• Potassium

(ii) Methods that could be used to apply specimen E (NPK 15:15:15) on a farm -

• Ring Method Side dressing/placement/row placement
• Top dressing
• Broadcasting
• Foliar spray/ fertigation
• Band placement

(b). Agricultural uses of specimen F and G

Specimen F (Wood ash);

• Liming material to correct soil acidity
• Sprinkled on crops to control insect pests
• Provides nutrients (Potassium) for crop growth
• Used to correct acidity in fish pond
• Used in compost making
• Increases growth to phytoplankton in fish ponds
• Used in controlling pond algae
• Used to increase the rate of percolation in clay soil 

Specimen G (Limestone) -

• Supplies calcium for crop growth/adds nutrients to the soil
• Added to the soil to improve its structure
• Used to correct acidity in fish pond water
• Used to reduce turbidity in fish ponds
• Used to reduce soil acidity/1iming material
• Applied to clay to release locked-up nutrients the soil

(c) Importance of specimen H (Cow dung) to the soil;

• Adds nutrients to the soil

• Improves soil structure

• Improves activities of soil microbes

• Improves soil water holding capacity

• Prevent rapid changes in temperature

• Provides buffering effect on the soil pH

• Improves soil aeration when it decomposes

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