slect ur market stall opn it 

thn clik on use bushel to use ur bushels for xp or mastry in farm ville

now slect tha bushel of same corp u hav palnted on ur farm

see u hav double mastry for 2 hours each plot gives u 2 mastry in farm ville

if u masterd 3 level of ur corp u get xp boost on harvesting tha same corp by using bushel in farm ville on facebook