Gaps in knowledge – the projected programmes include:

A. Further studies on proper site preparation; introduction of nitrogen-fixing trees
B. And multipurpose trees; arid and semi-arid zone afforestation; growing of trees in conjunction with agriculture; environment degradation assessment
C. Use of saline water for raising tree crops; forest genetics; setting up of seed orchards
D. All of the aboveCorrect Answer
Correct Option: D. All of the above

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