Define fertilizer.

Define fertilization.

Fertilizers

Define the Fertilization

What are fertilizers ? Classify fertilizers.

Compare the use of manure and fertilizers in maintaining soil fertility.

Compare the use of manures and fertilizers in maintaining soil fertility.

Excessive use of chemical fertilizers reduces soil fertility in the long run .

$ Crop rotation decreasess the soil fertility. ! High concentration of minerals is required as fertilizers.