Got 2 plants doing this. All but the last pic is this bif Sativa dom Blue OG. The last picture is Skunk #1 and looks like Ca and K.
Been doing this for about 3 weeks.
Havent been able to spend much time with these plants this grow. pH is 6.0 and feed is 1.4EC RDWC.
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Would we agree this is also a K def?
Northern Lights 3 weeks into flower under 2 SF1000s
Coco Perlite hempy
Feed: AN 3 part PH perfect PH: 5.6 EC: 1. 7
Runoff: 6.1-6.3 EC:1.7~
This one looks more Magnesium def to me … 
Hey man, you don’t give the fish but teach how to fish? 
This is the one I use, more complete, I hope that in three years I will distinguish them and I will have no need to check it … 
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I have that one too. The one you posted is way more complete for sure couldn’t find it though so going to copy yours.
Calcium. Happens all the time in coco. Did you use any PK boosters recently?
No PK boost just the 3 part mix. I have cal mag so i can add that to the next feeding, .2-.3ec worth?
I have a white widow in a pure perlite hempy next to it that is starting to show similar signs.
edit: That deficiencies picture is indeed very nice. Thank you for that.
Lefthand, thank you for the help, I agree with your assessment. I’ll slap some cal-mag in the feed and dose them up.
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Having that more complete poster is great since it shows that certain deficiencies that may look similar in the beginning will start in different parts of the plant. Great illustration for mobile vs immobile nutrients
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I’m not familiar with the AN line, but it looks like calcium to me. The calcium, magnesium and potassium system are all very tenuous in coco, because coco has the tendency to uptake calcium and magnesium (2+) ions, while releasing K(1+) ions. This is compounded by the fact that K <> Ca <> Mg are all antagonistic toward each other, so over supply of one can easily cause deficiency of another. So my recommendation is that if you start seeing signs of potassium deficiency, you will probably need to reduce how much calmag you use.
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The chart above eludes to this by showing leaves with Ca deficiencies on the K excess
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pH 5.6 in / 6.2 out indicates salt buildup, ime. Just my .02!