Info/Advice URGENTLY needed - generic nute questions

[align=left] Hello guys

I'm doing my first indoor grow using mostly generic materials (none of the brands mentioned in this forum is available in my country, or anything designed for indoor/hydro grow for that matter.) Currently I have my 20 sativa seedlings in two kinds of growing media that I have mixed myself; one is 40% sphagnum peatmoss, 30% fine perlite and 30% vermiculite; the other is 60% coco, 20% fine perlite and 20% vermiculite (coarse perlite is unavailable here at the moment but I will try to get some by next week.) the seedlings look healthy and are thriving at the moment but as feeding time draws near I'm a little bit worried about the nutes I'm going to use.

The best brand of nutes I could find here is called Yara Kristalon which is a Dutch brand (it is used for agriculture) , it is fully water soluble and is said to be suitable for fertigation and foliar feeding. the one I'll be using for veg has the following guaranteed analysis:
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Yara Kristalon Special: N-P-K-Mg: 18-18-18-3

Nitrogen (Total) 18%
-Nitric-N : 4.9%
-Ammoniacal-N: 3.3%
-Ureic-N: 9.8%

P2O5 18%
-Ammonium citrate: 18% (7.9% P)

K2O: 18% (14.9% K)

MgO: 3% (1.8% Mg)
SO3: 5% (2% S)
Boron: 0.025%
Copper: 0.01% (0.007 chelated by EDTA)
Iron: 0.07% (0.07% chelated by EDTA)
Manganese: 0.04% (0.028% chelated by EDTA)
Molybdenum: 0.004%
Zinc: 0.025% (0.018% chelated by EDTA)
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My city's tap water is a bit heavy in CaCO3 so I'm using it to compensate for the lack of Ca in my nute solution. if I see a Ca deficiency I will resort to Epsom salt as nothing else is available.

I will be moving the babies to bigger pots and will start feeding them in a week. Half of them are going into 50% Coco and 50% perlite and the other half into 50% peatmoss and 50% perlite and a little bit of hydrated lime (Dolimitic lime is unavailable).

I will hand-water-to-waste the coco pots and will fertigate the peatmoss pots combined with weekly flushes. (I'm using two kinds of media to see which one to adopt for my next cycle.)

BTW my seedlings are under 128 watts of 6400K Half-Spiral CFLs (1900 Lumens per 32W bulb, 7600 Lumens total) at the moment and are going under a 400W enhanced spectrum 2100K BLV/USHIO Growmaster HPS (58500 Lumens, high PAR rating) after repotting. I have space for finishing 5-6 females. I will be topping/training them and I'm planning to ScrOG them for the flowering stage. I am still undecided as to what nute to use after veg, but there are a few available from the same brand that sound promising.

What I'm worried about mainly is the high amount of ureic-N in my veg nute which I hear is unsuitable for soilless media as it's not easily absorbed and it acidifies the media. so any info/advice as to how to use this nute without a serious problem and/or how to manage the probable pH fluctuation or N deficiency would be greatly appreciated.

Also if anyone sees a problem with my plan, I would be very thankful to get some feedback.

Thank you for your time,

mNz6

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