MrStinkyanswered grow question 3 years ago Looks like you are in soil so try upping your ph to around 6.3, manganese is quite a rare def from what I understand - with the calmag make sure you arent adding too much (unless using RO water to up your ppm) as high concentration of Calmag can actually cause a lock out. Check your runoff for ppm and if it is sky high cut back on calmag perhaps?