Grow them cheap.
Agreed, but hard to do with a big broad leafed weed pressure. My spring beans had 3 l/ha PDM and 0.25 Centium pre em then 2 l/ha Troy (Basagran) + oil post em plus a graminicide.
Herbicides £77.61/ha
Fungicides £12.10/ha
Adjuvants £1.63/ha
Glyphosate pre drilling £7.63/ha
1 pass with Hallmark for pea & bean weevil £4.68/ha
Trace elements inc. phosphite for mildew £17.39/ha
Seed £138.59/ha farm saved but high seed rate for poor germination and late sowing
Rotational (more than this crop) P, K and Mg (kieserite for some sulphur + Fibrophos) £28.31/ha
Total variable costs £287.94/ha or nearly 2 t/ha of yield before they start paying fixed costs and rent.
I'll be harvesting them in the next week so will get an idea of yield and margin.