Question

suggest any three way to sustain land

Answer 1

afforestation, planting crops efficiently, by not leaving land baaren ( as it leads in loss of upprmost fertile layer of sand)

Answer 2

The way to sustain land are :-

1> Shelte-belts 
2>afforestation
3>Terrace farming
4>By efficiently planting crops
5>Stop land degradation 

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Best of luck ;)
ROYALJATT