Write three disadvantages of high yielding varieties of crops.

Explanation

(i) Being dwarf the HYVs of crops, yield less fodder than the tall traditional varieties of crops.
(ii) They need more frequent weeding.
(iii) They need continuous use of pesticides.
(iv) They need higher inputs like more water and more fertilisers as compared to traditional varieties.
(v) They are more susceptiable to diseases.