Hi dopeyG this has been buggin me all day as i didnt want to give you any wrong info so i did a bit of research i came across a picture very simular as yours but was alot worse it suggested you may have high PH here is a list of what you can use depending on your circomstances sawdust, composted leaves, wood chips, cottonseed meal, leaf mold and peat moss. Sawdust, composted leaves, woodchips and, lemon juice, PH DOWN but be sure to check hope this helps. I have lost many crops but have also learned along the way.