hydroponic Hydroponic Nutrient Strength: What works well?

with rockwool slaps you just nip one of the corners with a drywall knife and position the slab such that its sloped to drain through this slit corner. its super easy... just slip a cup under this slit corner and collect the runoff.
 
with containers or bags its more annoying... i put them up on two 4" thick cinter blocks and tilt them over to get the runoff to come out of only one or two of the drainage holes... like i said i dont really ever measure the runoff ec or volume on containers or bags because its just to much of a pita. i go by eye tbh.
 
Scuba_Steve said:
 
 
So I am a bit confused.  How do you measure these out?  It says you can use some of the same stuff to cover multiple areas.
 
Calcium Nitrate for example.  It is in the 190ppm NO3 and the 18ppm NH4.  So would I add 208ppm?  Plus another 170ppm for Ca?
Click to expand...
 
yea its just math, you can do it with a spread sheet or with software. i use both from time to time.
 
let me pull up my mix.... ill link it below.
 
the math is easy, but you dont really need to learn it unless you really want to.
 
basically you get the mole fractions and the molar masses of the macro and micro ions and calculate the milligrams per liter per 1 gram addition to 1 gallon of water.
 
there are alot of youtube videos that exhaustively run through the math, i can find them for you if you like.
 
here is my mix.
 

Values calculated for the preparation of 1 gallons

 

 

 

 

 

 

 

 

 

 

Potassium Nitrate

KNO3

2.671

0.3

 

Magnesium Sulfate (Heptahydrate)

MgSO4.7H2O

1.92

0.2

 

Potassium Monobasic Phosphate

KH2PO4

0.8

0.1

 

Peters STEM

Input Formula Here

0.113

0

 

Calcium Nitrate (Tetrahydrate)

Ca(NO3)2.4H2O

3.514

0.4

 

 

 

 

 

 

 

 

 

 

 

N (NO3-)

207.866

9.40%

+/- 3.2%

 

K

333.599

-1.90%

+/- 3.1%

 

P

48.082

20.20%

+/- 4.7%

 

Mg

50

0%

+/- 3.2%

 

Ca

157.514

-7.30%

+/- 2.7%

 

S

69.844

-80.60%

+/- 0.7%

 

Fe

2.233

-55.30%

+/- 5.1%

 

Zn

1.34

306%

+/- 46.8%

 

B

0.402

21.80%

+/- 14%

 

Cu

0.685

1269.50%

+/- 157.8%

Mo

0.012

-76.20%

+/- 2.7%

 

Na

0

0%

+/- 0%

 

Si

0

0%

+/- 0%

 

Cl

0

0%

+/- 0%

 

Mn

2.382

333%

+/- 49.9%

 

N (NH4+)

0

0%

+/- 0%

 

 

 

 

 

 

EC=1.8 mS/cm

 

 

 
 

fuck. how do you insert a spread sheet without it fucking up like that?
 
i did it before... idk wtf im doing wrong.

here, pasted from note pad...
 
Values calculated for the preparation of 1 gallons
 , , ,
,,,
Potassium Nitrate,KNO3,2.671,0.3
Magnesium Sulfate (Heptahydrate),MgSO4.7H2O,1.92,0.2
Potassium Monobasic Phosphate,KH2PO4,0.8,0.1
Peters STEM,Input Formula Here,0.113,0
Calcium Nitrate (Tetrahydrate),Ca(NO3)2.4H2O,3.514,0.4
 , , ,
,,,
N (NO3-),207.866,9.4%,+/- 3.2%
K,333.599,-1.9%,+/- 3.1%
P,48.082,20.2%,+/- 4.7%
Mg,50,0%,+/- 3.2%
Ca,157.514,-7.3%,+/- 2.7%
S,69.844,-80.6%,+/- 0.7%
Fe,2.233,-55.3%,+/- 5.1%
Zn,1.34,306%,+/- 46.8%
B,0.402,21.8%,+/- 14%
Cu,0.685,1269.5%,+/- 157.8%
Mo,0.012,-76.2%,+/- 2.7%
Na,0,0%,+/- 0%
Si,0,0%,+/- 0%
Cl,0,0%,+/- 0%
Mn,2.382,333%,+/- 49.9%
N (NH4+),0,0%,+/- 0%
 , , ,
EC=1.8 mS/cm
 
 
note the huge deviations in copper and some of the other micros.
 
this is because of the peters STEM micronutrient mix... you can do better with plantex CSM+boron... but its more expensive.
 
the copper deviation is not a problem though... its just more than necessary. STEM is what alot of greenhouses use, but you can buy the individual chelated micros if you want... will just cost a shit load more.

these are comma seperated values. every comma denotes a new value.
 
note that the third value in the salt break down is 'preperation cost' ignore that.
 
 
this is all from hydrobuddy btw. a free piece of software that should be available still.
 
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