Define:
1.multiple cropping
2.fallow
3.crop rotation

Kindly refer to the following links:
1) https://www.meritnation.com/ask-answer/question/what-is-multiple-cropping-explain-giving-examples/crop-production-and-management/2244832
2) ​https://www.meritnation.com/ask-answer/question/define-fallow/tribals-dikus-and-the-vision-of-a-golden-age/4825809
3) ​https://www.meritnation.com/ask-answer/question/what-is-crop-rotation/improvement-in-food-resources/5851234