Boron deficiency?

[AdaminCO]

It sounds like you are watering correctly and you are correct that in flower you really don't want to go quite as dry as you do in veg, at least after stretch is finished. At that point the rapid development of the roots and the rapid growth at the top are finished, and the plant settles into the business of building buds. At this point it is time to start using those roots you developed in veg, to see just how much water you can get the plant to uptake from here on out. You goal is to establish a quicker water cycle, optimally watering every day, or if that is to labor intensive, every other day or at the most a 3 day watering cycle.
The way you flip to this new mode of watering is easy since you probably have a good idea by now how much water it takes to totally saturate the rootball and achieve runoff. Divide that number by how many days interval you have established by then and figure out what your daily water use is. Start watering with this much water, every day, or whatever interval you have decided on, and carefully note whether it takes more or less water than you figured to achieve runoff. The next day, if it takes less water to achieve runoff, you are giving too much, and try to find that magic amount that gets you to runoff each day, while still allowing the container to go mostly moist. You don't want a lot of water weight in there between waterings and you certainly don't want to get to a point where you are waterlogging the plant... but try really hard to figure out what that plant is using each day. If it takes more to achieve runoff than you figured and the plant is going dry between each watering, you are doing good... and just try to keep up with it. Once flowering starts you want to continue giving water/nutes, alternating with each watering, but now instead of only being able to give nutes once or twice a week, you are able to do it 4 or more. More nutes, more water, equals bigger plants.
The spots look like nothing more than a very common calcium deficiency starting up. Add calmag to your nutes and if you are already giving calmag, increase the dosage.

Thanks Em. I think I’m on the right track then. I have been letting them dry too much.

 

[Dreadedknot]

Cal-mag has been ordered but won't be in for a few days. Ems', I read your DIY cal-mag reipe, very cool. I'm in a pinch for a emergency solution until the real stuff comes in. Can I do 2tsp organic milk (A2), 1tsp epsom salt and 1tsp molasses to 1 gal of water and ph to 6.5? Am I on the right track here? One of my gals is getting worse. Would like to have something ready to go when lights come on in a few hours.

 

[Remystemple]

These are the two charts I use.
You’re going to need to provide a bit more information for proper help though.
It seems like potassium, magnesium deficiency.

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so much different than my chart. and i've read a lot of times that P cuts out above 5.5.

 

[Emilya Green]

yes, a foliar feed of epsom salt is a common band-aid for magnesium in a situation such as yours. The milk and molasses will generate some lactobacillium on the leaves too, which is very helpful, so yes, whomever recommended this to you is a very wise gardener. I invite you to read my tutorial on how to make your own very powerful lacto serum too!
Best time to do a foliar by the way is at dusk... so that the lights don't cause droplets of water to become magnifying glasses and burn the leaves. Also, the stomas all open up when the lights go out, allowing a direct feeding right into the leaves.

 

[Dreadedknot]

yes, a foliar feed of epsom salt is a common band-aid for magnesium in a situation such as yours. The milk and molasses will generate some lactobacillium on the leaves too, which is very helpful, so yes, whomever recommended this to you is a very wise gardener. I invite you to read my tutorial on how to make your own very powerful lacto serum too!
Best time to do a foliar by the way is at dusk... so that the lights don't cause droplets of water to become magnifying glasses and burn the leaves. Also, the stomas all open up when the lights go out, allowing a direct feeding right into the leaves.

Ah, sigh of relief....thanks for all the help! I'll post a before treatment and day after treatment pic tomoro evening.

 

[AdaminCO]

so much different than my chart. and i've read a lot of times that P cuts out above 5.5.

Best part about organic soils, don’t have to depend on charts.

 

[Dreadedknot]

Before treatment.....

 

[Dreadedknot]

After treatment (Friday) and then watered about 5 hours ago....

 

[Dreadedknot]

One of them seems a little better and one about the same, if not a tad worse.
Cal mag came in today. I'm thinking straight ph'd water one more time. Then I'm not sure what to do, lol. Nutes, calmag, both? I reckon its wait and see what they look like in a few days

 

[Emilya Green]

since the foliar application was only a band aid, it is not surprising that the problem has not gone away already. Apply the calmag. Then next time with your nutes, apply it again and then switch to doing it with each nute watering. Leaves affected with this deficiency will never repair the bad spots, but you can keep it from progressing. Give it a couple of waterings to see what happens.