Why has the field been ploughed up?

As part of our Farm to Fork Week, Year 4 will be sowing some wheat, barley and peas on Friday. So we asked Farmer Hoskin to provide a 5 share plough to provide the earth to do our sowing. Thanks to Clive for his help!
The children will be seeing what difference treated and untreated seed makes to the success of the growing. They will also be planting some seeds at different times to see what effect that has.
We may need some help when it is harvest time because the combine certainly won't fit! Some manual labour I think!
Can I ask that parents help us by telling the children not to walk on the ploughed area after school?