guess this entirey depends on what you are doing with the grass, whether you can reduce stocking levels, and what your forage stores are like.At what price do you think it is uneconomic on grassland? Normal permanent grass, not new leys?
graze store cattle here, havent bought any grassland fert yet. got too much silage atm anyway. will make less silage next year to reduce surplus. will buy some fert in the spring if price drops. if it doesnt will sell some store cattle a bit earlier in the summer to reduce my demand, or top up requirements with silage at pasture.
lots of hay about? is it cheaper to buy hay now than fert?
much harder to do on a spring block calving dairy.