Describe the role of irrigation in improving crop yield. Mention any one effect of it if it is used in excess.
Irrigation provides water, necessary for the growth of plants and hence increases the crop yield.
If excess of irrigation water is used, then evaporation will deposit excessive salt on the surface of soil and decrease crop yield.
Explain the various methods of weeding.
Is having loose soil good for plants? What will happen if the soil is too loose?
Describe the role of fertilisers in improving crop yield. Mention one adverse effect of excessive use of fertilizers.
Why do the Governments in some countries impose restrictions on the import of plants? What are the advantages of having these restrictions removed?
