Being a farm manager is similar to a lot of farm work, in that you will be expected to have a wide range of skills and knowledge, and to be able to apply them to a variety of different situations. In addition, as a manager, you will be overseeing other employees, perhaps only one or two, perhaps several dozen at harvest time. As well as each job carrying a large number of different responsibilities, managing different farms can be a hugely different enterprise: Large stations can stretch over a million acres and contain tens of thousands of animals, whereas small fruit-growing farms may only take up a field or two and require a very different set of skills.
What all farm manager jobs have in common is a focus on outdoor, practical work. Unlike managerial jobs in an office or factory, you won't be holed up in an office somewhere giving orders via your secretary. You'll be out mucking in with the rest of hands.
As a farm manager you'll be responsible for the smooth running of the farm on a day-to-day basis. Obviously this encompasses very different things on different farms, but the basic principles remain the same: You must be familiar with farming operations for the type of farm you're working; you'll be responsible for overseeing the farm hands and making use of their particular skills and aptitudes; and you'll also be reporting to the farms owners and to any relevant government agencies.