Any students project work on agric engineering?
If you are into Farm Machinery (as I presume), I 'd suggest you to design/redesign some implement/some part for the largest grown crop in your country (which I couldn't find from your profile)... Think out of the box... I mean, don't limit yourself to the Production Technology only, take yourself to the next level like Post Processing and on wards... Anything that can ease the operation being followed by majority of your population... Hope you find it handy...
P.S. : I, myself designed "Tomato Seed Extraction M/C" in my final year... ;)