I see what you are saying now, I can see the entire plant much better. That looks like potassium deficiency. I may have asked you this in the past, I don't remember, I know you use
but did you get the Sledgehammer with it as well? Here is the thing, potassium is normally available but can be locked out by high salt content in the soil. With all the problems you had early on with too much N, and from the looks of the plant it is still pretty much in that same state. I am thinking you may still have a high salt build up in your soil. I don't use
but a buddy of mine on here does and he swears by using sledgehammer a few times during his grow to keep lockout from occurring. It flushes the excess salts out of your medium. I would consider getting some of that post haste and then adding your nutrients behind it. Below is snippet something I pasted the other day, you may find it helpful.
Technical Information: Potassium helps combine sugars, starches, and carbohydrates, which is essential to growth by cell division. It increases the chlorophyll in the foliage and helps to regulate the stomata openings so plants make better use of the light and air. Potassium is essential in the accumulation and translocation of carbohydrates. It is necessary to make the proteins that augment the oil content and improve the flavour in cannabis plants. It also encourages strong root growth and is associated with disease resistance and water intake.
Deficiency: Potassium-starved plants initially appear healthy. Deficient plants are susceptible to disease. Symptoms include the following: older leaves(first tips and margins, followed by whole leaves) develops spots, turn dark yellow, and die. Stems often become weak and sometimes brittle. Potassium is usually present in the soil, but it is locked in by high salinity. First, leach the toxic salt out of the soil and then apply a complete N-P-K fertilizer. Potassium deficiency causes the internal temperature and the foliage to climb and the proteins cells to burn and degrade. Evapouration is normally highest on the leaf edges, and that's where the burning takes place.
Progression of the deficiency:
- Plants appear healthy with dark green foliage.
- The leaves loose their luster.
- Branching may increase, but the branches are weak and scrawny.
- Leaf margins turn grey and progress to a rusty-brown colour. and then curl up and die.
- Yellowing of the older leaves is accompanied by rust-coloured blotches.
- The leaves curl up, rot sets in, and the older leaves drop.
- The flowering is retarded and greatly diminished.
Treat deficiency of potassium by fertilizing with a complete N-P-K fertilizer. Occassionally, a grower will add potassium directly to the nutrient solution. Organic growers add potassium in the forum of soluble potash(wood ashes) mixed with water. Be careful when using wood ash, the pH is normally above 10. Use a pH-lowering to bring the pH to around 6.5 before application. Foliar feeding to cure a potassium deficiency is not recommended.