@THSee, I couldn’t help but notice that you have a Deficiency going on there its…
I know your getting ready for harvest but I couldn’t help it…its what I do…lol
There are several ways to resolve magnesium deficiency, but one of the better options is a product called Marijuana Booster. This is one is very popular amongst marijuana growers because it is great for enhancing the quality of yields and provides a good balance of nutrients.
More options are:
Since both Epsom salt and Magnesium sulfate (wiki) are water soluble, they work the best. For hydroponics systems, Epsom salts are by far the simplest solution. For every gallon of water in your tank add a teaspoon of Epsom salts. Give it a quarter of the initial dosage for every consecutive treatment. If you like, you can even add Calcium-Magnesium (available at this link for only $20)
Magnesium and pH levels
Magnesium ph levels weed
If the pH of your plants roots get too low, the marijuana plant could display signs of magnesium deficiency, even more so in hydro (check these hydro ph levels). This occurs as a result of the pH of the roots not being at the right ratio, which causes the plant to not properly receive magnesium from the roots.
Usually with this deficiency, the magnesium is there, but the roots are not able to receive the magnesium efficiently because of the wrong pH. This is why it is necessary to keep the right pH so as to prevent magnesium deficiency.
Download my free marijuana grow guide at this link for more growing tips
Providing additional magnesium to a system that has a pH lock-out will most likely not help since the plant can’t take in any magnesium until the pH is made right. If your plant has plenty of magnesium, giving it more could result in the development of other deficiencies by shutting out other nutrients the plant needs.
If you’re growing marijuana in soil, magnesium is better received by the roots in the 6.0 – 7.0 pH rate. If your’re growing marijuana in hydro, magnesium is better received by the roots in the 6.0 – 6.5 pH rate.
If suspicion sets in and you begin thinking you plant has a magnesium deficiency, flush the system with pure, pH’d water that has a normal dose of marijuana-friendly nutrients in it which should include magnesium. This serves to get rid of all nutrient salts that are may have damaged the plants ability to absorb magnesium and help replenish the pH to the right ratio.