I think there could be other solutions than outright sharing profits. I'm thinking something like higher tractor-rent during more desirable weeks. I don't know

I think there could be other solutions than outright sharing profits. I'm thinking something like higher tractor-rent during more desirable weeks. I don't know a lot about farming but I think there is also a risk management thing that needs to be dealt with: Planting earlier or harvesting later than optimal means higher risk of crop failure. This could be handled with insurance.