Xero have compiled an agriculture-specific chart of accounts template that you can use as a great starting point for getting your Xero account up and running.
Take note to remove any accounts you don't think you'll be using - i.e. if you're a cropping farmer, you can remove any livestock accounts and vice versa.
The chart of accounts can be downloaded below:
For further information and resources on getting started with Xero, select your country to be taken to Xero's help centre: