Jack's has a cannabis Feeding Chart NOW!

[mexweed]

jacks is starting to involve silly things though like a specific clone formula

if you're into the 321 I recommend the mb ratio 221, I'm not sure why it wouldn't work with jacks, jacks recommends 3.7 for their base which is too much imo

 

[ShowMe_Cannabis]

We use jacks and have good results. The p/k ratios are a little off but we adjust and do well with it.

 

[jackspratt61]

High P myth? Yet their website banner shows purple petioles. I think Jack needs more P!

I'll continue ignoring fertilizer companies until they make the connection between lights and nutes. Outdoor? Led? Intensity? All major factors.


We all know why led growers have purple petioles and blue leaves.. Because they are lacking!

View attachment 18782097

Anyone selling some old 10-12 band blurple leds? I threw away the 3 band quantum boards that all the grow forums recommended. Could use about a thousand watts. Kinda odd that phosphorus deficiency has been normalized in my opinion. No wonder there's so much bland, sugar free weed today. Raising temps to 85° doesn't quite cut it,obviously.

LED demands addl B and Mo to aid the Ca/P balance. HPS doesn't. The jrpeters MOST ratios with B/Mo boost works great.

 

[coxnox]

Bore and manganese ?

 

[jackspratt61]

Bore and manganese ?

Boron/Molybdenum

 

[kalopatchkid]

jacks is starting to involve silly things though like a specific clone formula

if you're into the 321 I recommend the mb ratio 221, I'm not sure why it wouldn't work with jacks, jacks recommends 3.7 for their base which is too much imo

I noticed Jacks raised the 321 feed rate to 3.7/2.5/1.1 from the old 3.6/2.4/1.2.

Before I started mixing it into stock solutions I always just did a straight 3.0/2.0/1.0 because I felt like 3.6 was too much.

 

[indocult]

LED demands addl B and Mo to aid the Ca/P balance. HPS doesn't. The jrpeters MOST ratios with B/Mo boost works great.

How are you adding B and Mo, and how much?

 

[jackspratt61]

Boric acid and sodium molybdate.
Rates will depend on the feed you're using and the total calcium.
An easy way to test is foliar using B at 25ppm/Mo 1ppm. Spray every 2-3 days and look for response.

 

[indocult]

Thank you for that, would you still use additional molybdate on top of MOST?

I haven't ever used MOST, recently switched 75% of my D.E. lamps to growerschoice LED's.

Everything under the LEDs are not happy, I use jacks/calnit (3.2/2.5) and Mendocino gardens flowering cal mag (5ml/gal) with a boost of homemade Hammerhead for pk week 3-6.

I upped the jacks and cal mag, but I'm definitely going to have to add something to get the ladies to act right under the LED. I think MOST and your suggestions are a good starting point.

 

[jackspratt61]

Thank you for that, would you still use additional molybdate on top of MOST?

I haven't ever used MOST, recently switched 75% of my D.E. lamps to growerschoice LED's.

Everything under the LEDs are not happy, I use jacks/calnit (3.2/2.5) and Mendocino gardens flowering cal mag (5ml/gal) with a boost of homemade Hammerhead for pk week 3-6.

I upped the jacks and cal mag, but I'm definitely going to have to add something to get the ladies to act right under the LED. I think MOST and your suggestions are a good starting point.

I'm under gc680. Went from hps to led and experienced same issues. You have any pics?

 

[indocult]

I'm under gc680. Went from hps to led and experienced same issues. You have any pics?

I'm also under gc680. I'll take some pics tomorrow, I don't have any of this run so far. I'm a little embarrassed of it, I think my first grow ever looked better...

 

[indocult]

Healthy under hps, hungry under led

 

[iStruggle]

This is the 2nd time ive heard about jacks. I assume its good? Is it for soil or coco?

 

[jackspratt61]

Healthy under hps, hungry under led

You may only need b and mo to start with. You will need to do trials. Add 20%,40%,100% additional b and mo to your existing feed. Bring them up together. A couple small transplants of each will be enough.

 

[indocult]

You may only need b and mo to start with. You will need to do trials. Add 20%,40%,100% additional b and mo to your existing feed. Bring them up together. A couple small transplants of each will be enough.

Alright I'm a derp, but I'm having trouble calculating how to add sodium molybdate 39.5% powder for 1 ppm, as well as boric acid for 25 ppm in a weight per gallon ratio.

 

[jackspratt61]

Alright I'm a derp, but I'm having trouble calculating how to add sodium molybdate 39.5% powder for 1 ppm, as well as boric acid for 25 ppm in a weight per gallon ratio.

What are the %'s of metals in your feed and the total ppm calcium per feed?

 

[indocult]

N - 152
P - 51
K - 209
mg - 73 - 82
S - 82
Ca - 155 - 173
Fe - 2.9
B - .4835
Mn - .4835
Zn - .145
Mo - .1837
Cu - .145

That's for flowering, minus the PK booster. The mg and ca get bumped up during stretch, which is why the range.
Would .01grams/gallon of molybdate be a good starting point?

 

[jackspratt61]

N - 152
P - 51
K - 209
mg - 73 - 82
S - 82
Ca - 155 - 173
Fe - 2.9
B - .4835
Mn - .4835
Zn - .145
Mo - .1837
Cu - .145

That's for flowering, minus the PK booster. The mg and ca get bumped up during stretch, which is why the range.
Would .01grams/gallon of molybdate be a good starting point?

Using a 17% Boric acid .01 g/gal yields .48ppm b
Use half that rate for .24ppm b. That will give you two trials to look at.The mo looks good. Trial the b alone first.
You may consider using gypsum for calcium instead of calmg.
The red your seeing is p/k imbalance.

 

[indocult]

Too high of K too low of P?

 

[jackspratt61]

Too high of K too low of P?

In your case I'd say k.