Under pure Communism (not to be confused with the "communism" of Stalin, China, N. Korea, etc.), the farm is not owned by the government but by the proletariat, who also hold most of the power in society. Also, the farm would be farmed by people who want to farm. This individual who does not want to work hard farming would have the opportunity to find work she finds gainful and fulfilling. It would be partly farmed by people who would farm one year, do something else the next, and then farm again later on.
At the risk of heading a little OT, how do you spread labour amongst the requirements of society? Who supports the arts, and (conversely) what is to stop no talent hacks who have a love for a particular form of the arts working their backsides off to no great effect or value?
(sorry, that's just supposed to be an example, not a literal argument)