Strength for corrective foliars?

[plantingplants]

I've been googling and so far have found that 2-4% potassium nitrate solution is recommended for corrective K foliar.

3785 ml in a gallon... 3785*0.04 = 151.4 grams goes into one gallon to make a 4% solution.

pot. nit. is 13-0-45 ..so 151.4 grams * 0.54 = 81.756g k2o in one gallon

81.756 / 3.785 = 21.6 g/L k2o...... 21600 ppm k20 * 0.77 =

16,632 ppm K

Is that right? I have 0-0-17 kelp extract. so I'd need 333g in one gallon. I think my plants will turn black at that concentration.


again for calcium nitrate. Haifa recommends 800g/100L. Southern Ag recommends 5 lbs/100 gal. We'll go with Haifa's higher rec which is 8g/1L

calnit is 19% ca, 15.5% N... 1000mg in 1 g, and ppm = mg/L...

so 8000mg*0.19 = 1520 ppm Ca

for N, 8000mg*0.155 = 1240 ppm N

Am I doing this math right? Just seems like a strong concoction there...

 

[plantingplants]

Saw a branded seaweed extract at the shop, suggested two tbsp for foliar. That's... 24g/gal. That's 831 ppm K.

What's going on here...

Isn't K somewhere around a couple thousand ppm in the leaf?

 

[Loc Dog]

Saw a branded seaweed extract at the shop, suggested two tbsp for foliar. That's... 24g/gal. That's 831 ppm K.

What's going on here...

Isn't K somewhere around a couple thousand ppm in the leaf?

You may want to post the question in the Infirmary forum. I have no idea about the answer, but would think 600 - 900 PPM max for the spray, depending on strain.