The bucket of pish would have a bit of N in it so bang goes the low input.I'm not sure how they are determining it is low input. However, I would normally grow wholecrop with zero P and K (comes from animals instead), ploughing and combi drilling (but not always), maybe some pre-em herbicide, it would depend, about 50 units of nitrogen and probably 2,3 or 4 passes with the sprayer depending on the crop. Spring barley probably a 2 pass wonder but it would not just be a little bit of eagle which would be as much use as a bucket of pish in a housefire on much of the land around here. We used to use wholecrop as a pioneer crop a lot and use it to sort land out before putting it back into decent grass leys.