@archie gemmill pretty sure the cause of my issue was low ph my ph meter was out of calibration leading to calcium lockout
Live Stoner Chat Northern lights deficiency, help please!
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Taken from an online source.
Coco is known as a neutral grow medium, but there actually are cation exchange sites in coco. These sites on the surface of the coco fibers will form bonds with particular nutrient cations. The cation exchange capacity of coco is unlike soil or other grow media. The cation exchange sites in coco naturally come loaded with sodium (Na) and potassium (K) cations. However, the Na and the K are only weakly held to the exchange sites. In the presence of calcium (Ca) or magnesium (Mg), the sites will release their Na or K cations and lock onto the Ca or Mg. Once the cation exchange sites in coco have locked on to Ca or Mg, they are “buffered” and stay remarkably stable.
The cation exchange sites in unbuffered coco can pull nearly all of the Ca and Mg out of a solution. If you try to grow cannabis plants in unbuffered coco, they will experience Ca deficiency. This is tough to correct while plants are growing because Cal/Mag supplements have a strong impact on Electrical conductivity (EC). The total dose that you can provide is limited by EC, even though it all may be going to the coco and none to the plant.
This is why cal mg every feed with coco.
:smoking:
Coco is known as a neutral grow medium, but there actually are cation exchange sites in coco. These sites on the surface of the coco fibers will form bonds with particular nutrient cations. The cation exchange capacity of coco is unlike soil or other grow media. The cation exchange sites in coco naturally come loaded with sodium (Na) and potassium (K) cations. However, the Na and the K are only weakly held to the exchange sites. In the presence of calcium (Ca) or magnesium (Mg), the sites will release their Na or K cations and lock onto the Ca or Mg. Once the cation exchange sites in coco have locked on to Ca or Mg, they are “buffered” and stay remarkably stable.
The cation exchange sites in unbuffered coco can pull nearly all of the Ca and Mg out of a solution. If you try to grow cannabis plants in unbuffered coco, they will experience Ca deficiency. This is tough to correct while plants are growing because Cal/Mag supplements have a strong impact on Electrical conductivity (EC). The total dose that you can provide is limited by EC, even though it all may be going to the coco and none to the plant.
This is why cal mg every feed with coco.
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Check to see if the cal/mg you use can be used as a foliar. Might help get you over the root zone ph issue.
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coco loves cal/mag 
ph pens go outa whack all the time,sometimes when the lil end bit dries up they never work again 
good to see ya pointing the right wa again
good luck n keep er lit
ph pens go outa whack all the time,sometimes when the lil end bit dries up they never work again good to see ya pointing the right wa again
good luck n keep er lit
I just watered my coco with 6.01 and cake out runoff at 5.3 any ideas on what I should do
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