Thanks for your query.
Some criterion while selecting crops for inter-cropping system are.
- Tall growing crops with short growing crops.
- Bushy crops with erect growing crops.
- Fast growing crops with slow growing crops.
- Deep rooted crops with shallow rooted crops.
- Short duration crops with long duration crops.
- Legume crops with non-legume crops.
- Crops should have least Allelopathic effect.
- Crops selected should be of different families to avoid pests and diseases.
For more information please check:-
http://ecoursesonline.iasri.res.in/mod/page/view.php?id=15779