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What do you mean by varietal improvement?

Varietal improvement means introduction of new varieties of crop plants in our country. These varieties have good yield. They are disease resistant. It is done by cross breeding and selection. It forms the backbone of modern agriculture. Plant breeders get this by hybridization.

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32 Name the major group of activities for improving crop yields 33 What is the requirement of high yielding varieties? 35 Name the scientist who introduced Mexican variety of wheat in India. 36 Mention a crop that would enrich the soil with nitrogen.