First Ebb Flow Grow yellow leaves suspected deficiency

Ok so I have an issue with my grow, its almost 3 weeks into flowering. All plants are Blue Dream.
I have 10 under x2 1000w, average temp 68 average Humidity 55%.
The grow is a Ebb flow system using clay pebbles and a few are in Coco mon.
Water PH is kept at around 5.8 and at present the PPM of the water is 850.

I’m using Botanicare range including:
Pro Bloom
Sweet
Silica Blast
Cal – Mag
Hydroplex
Liquid Karma
Super Thrive
Aqua shield
Tap Water

Bloom I measure based on what the ppm is after I add ¾ the recommended dose of everything then topping up the PPM at the end with the base nutrient.

So there have been a lot of yellow leaves in the past week after rising the PPM about 100 to 850. Seems a little early in flowering to see so many yellow leaves.

Previous problems”
1) High PH during veg as I didn’t have a digi PH meter and chemical indicator was causing me to have a high PH for a week or so.
2) Have had a little powdery mildew problem but I caught it early and treated it which seems to have completely cleaned up.

Have a few ideas based on what I have read but wondered what you guys thought. Could it be Nitrogen or sulfur deficiency. Does anyone know what Botanicare products have the main supply of Nitrogen and sulfur?

Not the best pic but you can see the difference in color.

Looks like nitrogen to me. Im not too experianced with hydro though. Your probably ok though. Just monitor them for a few days.
Besides, your plant isnt really using any nitrogen during flowering. You could add a little liquid fish to the res to see if the yellowing stops. Id start with just a little bit though (1/4 strength)since too much will retard budding a little.
Sulfur deff is usually indicated by white-ish colored leaves. Use a flash light and see if the leaves are yellow or whiteish yellow.
In my opinion tho, just leave it alone. Your plant looks fine other than the yellow leaves. Micro nutrient deff isnt a huge deal, as long as your NPK are in balance.
Keep an eye on em, aslong as the leaves are just turning yellow, your fine.

GreenChile said:

Looks like nitrogen to me. Im not too experianced with hydro though. Your probably ok though. Just monitor them for a few days.
Besides, your plant isnt really using any nitrogen during flowering. You could add a little liquid fish to the res to see if the yellowing stops. Id start with just a little bit though (1/4 strength)since too much will retard budding a little.
Sulfur deff is usually indicated by white-ish colored leaves. Use a flash light and see if the leaves are yellow or whiteish yellow.
In my opinion tho, just leave it alone. Your plant looks fine other than the yellow leaves. Micro nutrient deff isnt a huge deal, as long as your NPK are in balance.
Keep an eye on em, aslong as the leaves are just turning yellow, your fine.

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Thanks, some of the leaves are a pale yellow some would call it almost a creamy yellow but not sure if this means its a sulfur problem. Not all the plants have it as bad as two of them but today I pulled off all the leaves that where close to falling off to get some light through and improve the circulation. Think I should have done some pruning ages ago frankly. I have noticed the roots are not as white as before when I checked them during veg, now they have a almost pink color to them. I may start using full nutes only restricting the base nutrient to around 900ppm. Thanks for you help, any other advice would be appreciated!

So one plant over the last few days seems to be hit pretty bad, I will put up some pic once my lights go off tomorrow. Anybody see anything else wrong with my method? Nutes too low? Anybody?

https://www.rollitup.org/attachment.php?attachmentid=2068136&d=1329647718Ok so this is a pic of a leave I pulled off the worst effected plant. As you can see its badly burnt at the tips, going yellow from the tips back to the stem. This is the beginning of week 4 of flowering, I have been looking and looking to find an answer but still unsure what to try. Still think it has to be a nitrogen deficency or toxic salt build up, I'm getting these guesses from this link:
http://www.marijuanapassion.com/forum/showthread.php?t=54277
Please if anyone has any ideas please let me know, ebb flow seems to be a very hard to balance way of growing and I have refined mine with my knowledge as best I can but now I really need some help with this problem before its too late.

How many gallon is your reservoir? I is not looking like N to me, N starts at the bottom and works its way up. My guess is micro nutrient problem due to either ph lockout or lack of nutrient reserve.

Internode said:

How many gallon is your reservoir? I is not looking like N to me, N starts at the bottom and works its way up. My guess is micro nutrient problem due to either ph lockout or lack of nutrient reserve.

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My res is 50 gallons. What is PH lock out? I monitor my levels very closely and it never goes above 6.1 or below 5.8.

Internode said:

How many gallon is your reservoir? I is not looking like N to me, N starts at the bottom and works its way up. My guess is micro nutrient problem due to either ph lockout or lack of nutrient reserve.

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Ok so I have read up on PH lockout but most the info I can find is based around soil grows. It seems with soil a PH of 6 to 7 is the best way to prevent PH lockout. I'm guessing this is not the same for ebb flow which as far as I'm aware requires a lower PH. Any ideas people? I have to change my res today which I do every 7 days and it would be nice to get it right. I feel like maybe I should be around the 1000 PPM mark about now in the grow but terrified this will cause more problems. At the same time if its a deficiency maybe it will be the fix I'm looking for. As before any input is welcome!

Ok problem sorted! Nothing to do with the feed or anything like that. It was my feed pump had packed in! Can't believe I didn't notice before hand but oh well. Going to flush for a day or so and then put them back on the nutes.