Is there a Chemist in the house?

Making preparations for my first grow: white-surfaced, ventilated cabinet - 135 long x 125 high x 64cm wide - custom made; 11 x 36 watt (cool white/warm white) fluorescents (16,500 - 22,000 lumens) wired into cabinet lid (62 x 135cm); inline fan vents to sewer; fan (heater) on timer circulates air.

Now ready to prepare soil. Brand-name nutrients, etc. are not available here. The main constituents of locally produced fertilisers are denoted by three numbers in this order: 1) N (presumably nitrogen), 2) P2O5 (donâ??t know what the hell that is) and 3) K2O (potassium?). They are also designated for certain uses, i.e. the one for cucumbers contains 17 (N) 7 (P2O5) 16 (K2O). The question is, â??How can I make use of this stuff?â?? Hereâ??s a list of what I can get, what itâ??s designated for and its chemical composition, as outlined above:
Cucumbers â?? 17-7-14
Berries â?? 5-14-28
Tomatoes â?? 12-6-16
Garden â?? 5-14-28
Autumn â?? 4-19-19
Feed â?? 9-11-12
Mark â?? 17-7-14
How much should I use of what and when?

Iâ??ll be using a mix of potting soil with Perlite (very difficult to find â?? had to drive for 1½ hrs. to get it â?? and very expensive here). Vermiculite is not available, so the mix will be some 60 to 70% potting soil, 30 to 35% Perlite, some gravel at the bottom of the pots and about 1cm of clay balls on top of the soil. Iâ??ve got some bird poo-poo (1kg.) as well.

Some bottled German nutes may be available, but their names donâ??t give me a clue as to what they do and we live in a small town where strange questions donâ??t go unnoticed. If you can comment on brand-name nutes in Germany or Finland, not forgetting their exact names, that would be very helpful.

By the way, if you can think of a reason why I might be needing this stuff in January, that could be very helpful, as well. I've found myself at an embarrassing loss for words before, when shop assistants ask me what I want to grow and look at me quizzically.

first off MJ shares a need for the same nutes as corn. look corn up. secondly, dont over-think this whole growin' thing. MJ is a weed & will grow despite some of our best intentions. the main reason for failure in a grow is to "over-love" your plants. during the veg cycle MJ needs more nitrogen than anything else, human urine has the highest nitrogen content there is, dilute it like 50ml urine to 1l water. make sure water has sat out 24hrs if using tap water. chlorine will burn young roots & will kill off good bacteria. if you can find blood & bone meal they are great for mixing with potting soil. the bird crap you can put in an old pantyhose & use it like a tea bag with your water. use this water every other time, if you get a very slight tip burn on leaves this is good, anymore than a few cm though & you will need to flush with plain water until it drains clear out the bottom of container. there are all kinds of things you can use, do a google for more info,..good luck over there. keep your head high & your pot low! r

for your feed id allways go organic secondly in the vegative stage you need a high nitrogen feed and low pottassium and phosphorous and in the flowering stage you feed it a high phosphorous feed