plant has deficiency's please help. with photos

sorry for making this again, the other thread seems dead.

i have yellowing of the leaves some are very bad some aren't as bad usally from the edges inwards. curling on leaves mag or cal i think.
but i cant tell if its iron zinc baron or what she is deficient

i am using 400w hps 2 fans, canna terra professional soil. canna terra flora nuets PH and PPM Are Unknown. she is 90 days old. strain is afghan kush special from world of seeds. 10 days into flowering at the moment ( noticed yellowing in veg ) also some dark green leaves other's are bright green and of course yellow-dying leaves. please help.




t.

All the pics except the last is magnesium foliar with 1tsp epsom/L. Heavy first application then watch for improvement continue light applications untill deficiency is fixed. U can also add .5- 1tsp/gallon to feed water once per week to retain mg levels the sulfur in epsomsalts is going to enhance aroma and potency and the extra m vBulletin add to potency and both along with calcium are second in line to primary nuts. Mosg fertilizer and bag soil jjust dknt have enough secondary nuts. The last pic looks like phosphorus deficiency. Kush loves tat P and K

thanks for the quick response. with the espomsalts should i mix with water and spray the leaves or mix into the soil for the roots?
also are sulfer and cal in the espomsalts? p and k should i get a little of that to?

Epsom salt is Magnesium Sulfate and it should not be sprayed directly on the leaves, but rather absorbed through the root system.

Magnesium is mobile elements and can be applied and quickly absorbed throught the leaves. It is meant as an innitial boost in the remineralzation of the plants tissue. Long term application is through the soil. Sulfur is immobile as well as calcium and have be absorbed thru roots. U can use magnesium sulfate monohydrate in the place of epsom salts.

Additionally there is not calcium in epsom salts.As far as the p/k booster yes its a good I'idea. U probaby have an organic soil mix and are starting to run out of nutrients. The booster you choose will depend kn what your soil is made of. If it is coco coir based then your booster should have less K as coco is naturally rich in potassium. Too much K will compete with calcium and magnesium creating a deficiency and the booster won't really work. I like big bud from advanced nutrients. Otherwise I use a lot of super rock phosphate with kmag and make my own booster based on strain needs