How much is an acre of standing crop silage worth this summer?

Fresh cut grass ready to be used to make silage on a dairy farm in south west Scotland. The photograph was taken as the sun was setting.
A standing crop of silage is worth about €340 per acre, according to a Teagasc evaluation.
But if it costs €150 per acre to make silage of it, the value of the standing crop is reduced to about €190.