Adding potassium nitrate to maxi bloom - need help determining quantity.

onthe420train

onthe420train

New Member
Well got this potassium nitrate 13-0-44 salt and MaxiBloom 5-15-14 to mix and want to get somewhere around 15-10-30... how much potassium nitrate should I add or how should I go about determining it using EC/PPM testing or molecular weight calculation? can weigh accurately to .01g
 
You're going to go blind running the conversions required to get your molecular weights anywhere close. And even then, you'll only think you know what you have without the benefit of anaylsis.

If you're hellbent to do it, get your weights and ratios "close" then start trial and error experemintation until you dial it in.

Seems like an awful lot of work when you have one excellent veg nute, and one pretty decent bloom nute...like to see a little less N, but hey, we live in the real world, not the one where everything is free.

I'd be interested in seeing you're final calculations if that's the route you go.
 
Yea from looking at the numbers think a good place to start would be trying about 200ppms of potassium nitrate solution combined with 900ppm of maxibloom. Have to make sure I don't add so much N and K that end up with mag def that can't be fixed with botanicares 2% N Cal-mag. Maxibloom runs N.05 P.15 K.15 Ca.05 Mg.035 Su.04 Fe.001 so any info on the minimum mag requirement would be cool. I'm going to go google stuff about this.
 
I found some formulas that call for 2.80g of KNO3 for a gallon of flowering fertilizer, so I oughta try about .75 at first with mostly maxibloom, which already has KNO3 in it... I'll be giving this a shot in the garden in a week or two.
 
This is from Plant Products 2010 catalog, the company that makes my 5-11-31. From this I have made a spreadsheet so I can manipulate it how I want. I use a 10L bucket to fill my reservoirs so I like to calculate everything in multiples of ten.

PPM Explanation
Often in designing fertilization programs, the term ppm appears. Simply, this means Part Per Million.
One ppm of a certain nutrient, such as nitrogen, means that the solution contains 1 part of nitrogen
in 1,000,000 parts of water by weight. There is an easy formula which can be used
to determine the ppm of a solution.
grams of fertilizer product x grade of fertilizer x 10 = ppm
litres of water in solution
It works like this: Plant-Prod 20-20-20 contains 20% N. To find the ppm of nitrogen in a solution
containing 1g of Plant-Prod 20-20-20 in 100 litres of water, the equation is:
1 (g of product) x 20 (grade of fertilizer) x 10 = 2 ppm
100 (litres of water)
One gram of Plant-Prod 20-20-20 in 100 litres of water has 2 parts per million of nitrogen in the
solution. To determine the number of grams required to make up a 200 ppm solution of nitrogen with
Plant-Prod 20-20-20 fertilizer in 100 litres of solution, simply divide 200 by 2. Your answer is 100 g.
 
I used that info to run a couple calcs about Maxi

Code: 
Maxibloom	
     [U]10g/10L[/U] [I]10g/4L[/I]  [U]5g/10L[/U]   [I]5g/4L[/I]
	50	125	25	63
	150	375	75	188
	140	350	70	175
	50	125	25	63
	40	100	20	50
	50	125	25	63
		1200ppm		602ppm

and about combining the two

Code: 
in 4L						
[U]2.8g/4L MB[/U][I] 2.0g/4L KNO3[/I]     [U]4.2g/4L MB[/U][I] 3g/L KNO3[/I] [B]tota[/B]l
	35	65		53	97	150
	105	0		158		158
	98	220		147	330	447
	35	0		53		53
	28	0		42		42
	35	0		53		53
						[B]903ppm[/B]

The tables didn't line up very well BUT If you look at the columns one at a time from left to right it makes perfect sense.

I think 447 might be a little too much potash... Floranova runs about 180 and Canna runs about 317. the N and P values seem to be in check and Mg and Ca right where I want them because I'll be adding cal-mag (2.0%N, 3.2%Ca, 1.2%Mg) to boost those three a bit.

will spend a lil more time on this and factor in my MaxiGro as well, which will hopefully let me manipulate the leves some more. Also I use liquid koolbloom (0-10-10) which will come in to play...

From the man Lucas himself
Lucas said:
Lets focus on the K (Potassium) and Mg levels in GH, Canna, and PBP

GH FloraNovaBloom 180ppm of K, plus 62ppm of Mg
Canna Coco with the PK 13-14 boost they recommend; 317ppm of K, 42ppm of Mg
Canna Aqua Flores 316ppm of K, 42ppm of Mg
PBPBloom with Cal mag 214ppm of K, 45ppm of Mg

in EVERY case, there is LESS potassium in GH than in Canna or PB

afaict, Canna and PB work DESPITE having MORE Potassium, and less Mg than GH
Click to expand...
 
might at first get five 1 gallon milk jugs and try 5 different possible solutions on 5 different test plants in hopes of finding the threshold of dangerous territory for high potash values... although it will vary from plant to plant so I ought to run the experiment using clones of the same strain.
 
Code: 
     MaxiBloom   KNO3  MaxiGro Plant Success		
N	5	13	10	3		
P	15	0	5	1		
K	14	44	14	2		
Ca	5	0	6	0		
Mg	4	0	2	0		
Su	5	0	3	0		
						
Grams	4	3	8	0		
						Desired
N	20	39	80	0	139	150
P	60	0	40	0	100	100
K	56	132	112	0	300	300
Ca	20	0	48	0	68	55
Mg	16	0	16	0	32	55
Su	20	0	24	0	44	55
total	192	171	320	0	683	715
plus epsom salts, maybe cal-mag, would be pretty good eh?
any better ideas for ratios? This is just for flowering here what I have.

wow I can really custom tailor my ratios now this is pretty sweet. I just need to figure out how to factor in liquids like cal-mag or flora.

having a spot of trouble adding liquids to the table like koolbloom and calmag.
koolbloom is made up of magnesium phosphate, potassium phosphate, and potassium sulfate, but the guaranteed analysis only reads 0-10-10 and doesn't give information about the quantity of magnesium or sulfur. at 13 ml per 10 liter the solution will be EC = 0.7 mS, 350ppm.
because its 0-10-10 does that mean it is 10ppm if 1 ml is added to 10 L? so the 350ppm would be like 130ppm P, 130ppm K, and 90ppm Mg/Su in the 350ppm standard?
 
Looks good to me. That site is useful great to see a detailed break down of a lot of fertilizers all in one spot. Just goes to show you that these fertilizers really aren't anything special and anyone can make them. Again I think if government can out think recommendation for optimum nutritients for cannabis 90% of the products would be off the market. If you really look at the labels of products the same basic ingredients show up over and over again. Those ingredients I am just trying to find the best quality for the cheapest price possible. I like canna, simple to the point not selling 101 products. And not selling tons of overlapping products just because they can. Same with pureblend. I don't like the sweet that is a waste of money. Sugar water with Epsom salt. Enough with the ranting great to see you mixing up your on ferts onthe420train. Hope you get great results and then show others how simple it is and how much money they can save!

:peace:
 
thanx man, also hoping to get great results hahaha. so I am a little uncertain about the fact that this Fertilizer PPM Calculator calculator uses factors for P and K and mine just calculates them straight across. should i be accounting for the fact that 4-14-15 is N, P2O5, and K2O, and change those to N, P, and K in my final ppms or just take it straight accross - I'm sure it just depends on how you look @ it but I wouldn't want to end up with far too little P2O5 because I didn't calc the final P.
 
nevermind - I discovered that the conversion factor he's using there is for a liquid nutrient. and thats why its tablespoons per gallon I was kinda pondering that for a minute. The conversions for liquid nutes are in my table down there.
 

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