Understanding NPK values

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jimmi2scoops
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Re: Understanding NPK values

Post by jimmi2scoops »

GMO wrote:
Thu Jan 30, 2020 12:19 pm
jimmi2scoops wrote:I not read link but will do in a bit @GMO. But my understanding of it all is say lets talk pk 13/14, well its only that in bottle, so lets say 80% of that bottle is water and rest pk13/14 in mix, so lets say that same bottle was 40% water and rest pk its would be pk26/28, its only those ratios whilst in bottle basically. You wanna be looking for npk ratios with higher numbers if you want more bang for your buck and i read dry ferts is where its at in that case, bottled ferts are a real con as we all know most of it is just bloody water. Another way to ,look at it is if its pk13/14 in bottle then mix it with 10 liters of water and its gonna be pk3/4. Well that`s how i always understood it all if i understood it in first place.
Yes yes yes jimmi. This is exactly what I'm talking. Like ya say 13/14 as example that's 13% p and 14% k (also as bixy pointed out earlier thats the total chemical weight not just the single element specified).

So we have to tools and knowledge to decide what as you say give you the most bang for your buck. But also allows you to meet your preferred ratios at each stage without too many additional bottles of this and that

translated from the bongo of the canna jungle
Theirs lots and lots of dry ferts that are made for hydro on fleabay that would last you ten times longer than a bottle of AnB > chempak nu 2 and 4 for veg and bloom come to mind but theirs others specifically for hydro if you look i forgot the ebay sellers name but thinking its my next move GMO. 8-)

Cool thread. :thanks:
Last edited by jimmi2scoops on Thu Jan 30, 2020 12:33 pm, edited 1 time in total.
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Re: Understanding NPK values

Post by GMO »

jimmi2scoops wrote:
weedabix wrote:
Thu Jan 30, 2020 10:59 am
I just read this thread and while I don't have an answer to the growing (I am a total noob) I understand your initial question as follows:
Do the NPK values represent ratios (ie. 1-2-3 would be the same as 2-4-6) or do they relate to concentrations (ie. twice the amount of 1-2-3 are the same as 2-4-6 if diluted by 1l of water)? Did I get that question right?
According to wikipedia, the convention is that these numbers represent weight percent of the elemental N and the oxides of P and K (US) and the UK allows to additionally state the elemental weight percentages of all N-P-K in parentheses. So it does refer to total concentrations in the fertiliser and if you were to use 2g of 1-2-3 in 1l it would be the same as 1g of 2-4-6 in 1l - roughly... in theory we'd have to use (roughly again) 998ml and 999ml respectively but I don't think that's the accuracy necessary here. There might be quite a difference between 1ml and 1g of fertiliser but if you really wanted to you could calculate that as well.
https://en.wikipedia.org/wiki/Labeling_of_fertilizer

Now this is all I can add to this and I am looking forward to hearing how to use those numbers now!
Yes cock on mukka that is, looking at it in a bit of a same but different way to how i put it in my last post, but both ways achieve same thing and result. :oik!:

Why do they not sell ferts like some tom feeds of lets say 20/20/20 for simple reason theirs not as much cash in it. You could make a bottle of tom ferts go ten times further, prolly only thing needs adding is a spoonfull of trace ellements every once in a while and that`s not called for really, ive seen some really nice grows crazy high npk tom ferts tom ferts, just ask Beefy.

Bigger the NPK ratios further your cash goes put plain and simple in my eyes. 8-)
Oh dear. That's a whole new can of worms 20-20-20 ferts again I'll put a pin in that convo for another time lol

I guess the final points kinda lead us to experience dictating use to some degree like was mentioned. There is a subtle balance that comes to all fertilizers and without a baseline or a guide to work from it can be hard to diagnose what's going on without the prior experience

I guess what I'm getting at is that is we use a base nutrient then add or subtract a single component we can start to build a physical understanding the nutrients have and their effects first hand

translated from the bongo of the canna jungle

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Re: Understanding NPK values

Post by jimmi2scoops »

Just an example 20/20/20 first number popped in my head @GMO .

Check out some of the dry ferts these guys sell on, man you`d never have to buy ferts again once bought. http://www.ebaystores.co.uk/Elixir-Gard ... 34.c0.m322 been tempted many times with some of their dry ferts but never have.

Summink else these organic dry fert pellets you mix in your coir now and top dress every once in a while thery cost a fortune , check the organic pellets and price here these guys sell look cock on to me and they would last you a generation https://www.ebay.co.uk/sch/Soils-Soil-A ... =drgrow123

Weed fert industry is a real con and a big money maker for the guys who produce it, they certainly aren`t your friendly weed grower types, they are just ripping us all off, but we still persist in buying them, i know i`m guilty of that.
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