What's wrong with these leaves?

I keep having problems with leaves turning brown and falling off on my plants. The Jorge Cervantes Grow Bible and everything else I read says N Toxicity, but I am adding less than the label says.

I tried Lucas Formula with the AN nutes for about 4 days when I ran out of AN Grow and this is the result so I went out and picked up more Grow today did a res change.

Here's the setup before today that led to this:

- 5 gallon bubble-buckets filled with approx. 3.5 gallons.

- using RO water, pH set to at 5.5-5.7

- 8/16 mL Micro/Bloom per Gallon and I measure it out for 3 rather than 3.5 so there's a .5 gal "buffer"

- also add 3 tsp Botanicare Aquashield and 3tsp Botanicare SilicaBlast every water change.

Today I bought General Hydroponics Flora Kleen to try and remedy the nute problem, I added 3 tsp to each bucket and let it run for 2-3 hours and then changed the res and began again with Advanced Nutrients 3 part G-M-B, 1.54 tsp per gallon so I just added 4 tsp of Micro and Grow per bucket and 1 tsp of Bloom I also added 1 tsp of Cal-Mag and 3 drops of SuperThrive which I also picked up today. I put in the SilicaBlast and Aquashield too, 3 tsp each.

What sucks is I dont have $200 for a ppm meter and have no idea whats in there so I have to just follow labels and measure carefully and hope for the best.

So whats wrong here and how do I fix it? Should I just wait, I think it looks worse cause I keep finding dead leaves.

these too?

The 2nd and 3rd picture look like P deficiency. If you dont know the PPM I dont want to be the one to tell you to add more because the last pics kinds look burnt but I'm not sure. You might need more lets see what everyone else has to say.

hmm, lookin a little better today since i redid the nutes, i hope that took care of it.

Good to hear.

The first leaves look like phosphate deficiency, the second set looks like potassium deficiency. Could be a sodium excess in the media.

Snow Crash said:

Could be a sodium excess in the media.

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Try skipping using your nutes for one watering and just use your PH water

your saying advanced nutes but this is all general hydro names of foods i see. one sentence shows only micro and bloom then below you have a whole bunch.
its phos deff. if you werent using the grow as it reads at first then theres why. and do you check the ph of the bucket after you mix or not once its topped off. it will change and you may need to keep adjusting it to keep it more steady.