Hi I’m in week 4 of flower and I’m using Athena pro line nutrient..everything seem to be going well and the discoloration happened over night . I started seeing the leaves getting lighter and veins are showing.. not really sure maybe magnesium deficiency and how do i correct it..i feed with 5.9/6.2 ph my runoff ph is 5.9 runoff ppm 1700.
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Yes, looking like magnesium deficiency. Are you using a CalMag supplement right now or just the base nutrients you mention? More info: https://www.mrgrowit.com/post/magnesium-deficiency-in-cannabis-plants
You got to increase your pH. You want to aim as close as possible to 6.5. You’re feeding 5.9 so the plants can’t really absorb the cal-Mag you are giving it (if you aren’t giving any you need to). It def looks like cal Mag deficiency to me. It’s not end of world, those leafs won’t recover I would recommend next few feeds feeding hiGh 6’s in pH like 6.8 test run off and see what it gets you. Repeat this a few feeds to get back dialed into 6.3-6.5 range sweet spot.