What is the Arnon and Stout (1939) criteria for plant nutrient essentiality ? Give account of forms of each essential plant nutrient element absorbed by plants.

2Medium20 marks

Describe the improved cultivation practices of Chickpea under the following heads :

(i) Improved varieties

(ii) Seed rate and row to row spacing

(iii) Nutrient management

(iv) Weed management

(v) Insect-pest and disease management

3Medium20 marks

Explain the term water use efficiency in relation to crop production. Discuss the role of pressurised irrigation methods to achieve the objectives of more crop per drop programme.

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