Translation:The quantities of grapes are small.
Can be also "The amount of graps is small?"
You must use the plural here. So it's "The amounts of grapes are small".
Why it does not accept Little as translation of Mici?
A quantity is always small, not little. See it as an expression ;)
I'm afraid of ruining my English with those unidiomatic phrases. Show me a single English native speaker who'd phrase it like this.