Stump remover is potassium nitrate, so you are getting some potassium but maybe not enough. You can use potassium sulfate for that or Flourish Potassium. If you are dosing nitrate, you need to be dosing phosphate too, so you have approximately a 1:20 ratio.
This site explains what levels you should shoot for. You might want to consider going with dry ferts, it will save you an amazing amount of money over Flourish and the like.
This site explains what levels you should shoot for. You might want to consider going with dry ferts, it will save you an amazing amount of money over Flourish and the like.
