Which one of the following would be the best strategy for ecology-friendly sustainable developme in Indian agriculture?
1
Improved farm implements and machinery, use of potent insecticides to minimise post-harves grain losses and monoculture cropping practices.
2
Mixed cropping and use of organic manures, nitrogen-fixing plants and pest-resistant crop 'varieties.
3
Wide use of high-yielding crop varieties, better and more frequency of aerial sprays of inorganic fertilisers and pesticides.
4
Expansion of cultivable land, increased use of super phosphate, urea and effective bioacids.