Also be aware that planting trees on arable land will result in the roots eventually disrupting field drains.
If you don't already have one, it would be very worthwhile to get a map of the location of all field drains not only in your field but also the neighbouring ones if you can. I have maps for all my fields dating from the 50's and 60's - very useful if you have repairs to do, which happens on a regular basis.
If I had bought a field which was of good enough quality to be suitable for growing barley I would not want to engage in any management activity which would reduce its agricultural value and productivity.