Phosphorus Deficiency??!?!? Please Advise

[edelephant]

Hey Everyone,

I've been searching far and wide and I'm pretty sure I got a case of Phosphorus deficiency. A friend gave me these plants and they've given me a few problems. I thought I had everything under control finally, decided to take clones from them on Sunday and Now this pops up. Ive been using the Advanced Nutrients line of Organics and moments after I took cuttings I sprayed them down with some Emerald Shaman, B-52, Wet Betty, and Colossal BudBlast to make sure they wouldnt stress too much. Other than that, my temp/humidity is in the proper range. My pH is just a tad high, but I combat that with a lower nutrient pH. Can someone verify that this is phosphorus deficiency, and if not, what is it? I was also thinking maybe I just used too much foliar spray and this particular girl got a bit sensitive.

Thanks for all the help.

 

[inc0gnit0]

My 1st impression was Mg not K.

 

[inc0gnit0]

I usually mix about 1\2 tsp Epsom salt to a 1 quart spray bottle. Soak them till the leaves drip. If things worsen up it a bit slowly.

 

[Guest]

My 1st impression was Mg not K.

Ummm Phosphorus is P in N-P-K. K is Potassium. I'm thinking it was the foliar spraying to be honest. I have no experience with any of those products but that seems excessive. Are you sure they are made to be used together like that? Did you place the plants under the lights directly after you sprayed them?

 

[edelephant]

They went back into the night cycle of a 18/6 regimen. I've that same foliar solution for months now with no problems.....

 

[Guest]

Well ... I keyed on the last sentence of your previous post. You seem to think it is possible that you may have over done it.

 

[sproutco]

Phosphorus excess

General yellowing of leaves, older leaf tips and margins later become yellowish or brownish, followed by coloured necrotic spots; leaf abscission develops (similar to potassium deficiency in some plants and nitrogen excess in others)

Can cause a zinc deficiecy. I see the margins along the leaves are wavy and go up and down as you look across them. Click on it to enlarge

 

[edelephant]

You think a good flush would solve the issue????

Thanks Sproutco

 

[sproutco]

Was there alot of phosphorus in your foliar spray? Have you been adding alot of p to your soil? What makes things tricky is that sometimes excess nutrients will make a plant look deficient and vice versa. Give more details about what your doing. How strong are your ferts and how do you mix them? Ph your using? Directions for testing are in my signature. If soil, then what is in it? Are you letting the soil dry out between waterings well? Add anything else you feel is important.

Here is a deficient plant of p according to mynamestitch. Your plant does kinda look like this though doesnt it. I would think you would be getting red and purple coloring on the leaves or on the stems or on the petioles. Is that happening?

 

[dre86]

I think it's a mixed problem.
When do you spray? 5-10 minutes before lights off? I think I see some burning from the light...

 

[Guest]

You are over loving your plants IMHO. Have you asked for advice from the manufacturer of those products? I think mixing 4 different Bud/Growth/Absorption/Whatever agents is having a negative effect on that plant. Why are you using the Hornbys on a plant in veg? I think the CBB and Wet Betty are doing more harm than good at this stage. Marijuana absorbs moisture very well from the undersides of its leaves and a Foliar Wetting agent is not necessary (once again this is just IMHO).

 

[Guest]

I agree with incognito, looks like magnesium to me

 

[sproutco]

I agree with incognito, looks like magnesium to me

While it does have interveinal chlorosis with the yellowing between the veins, IMHO it is becoming necrotic too quick. (brown patches) Mag def would be more yellowing without necrosis. Necrosis maybe only at the end of the leafs death with it almost solid yellow. This plant in the picture shows no necrosis or brown areas when having known mag deficiency.

 

[sproutco]

I am pretty sure this is what a phosphorus deficient plant looks like. Notice the stems and leaf veins of the plant have gone purple. This particular plant had not grown enough roots to support itself yet. Click on it to enlarge.

 

[edelephant]

I thought it might have been Mg def. as well, but I already had a problem with this same plant due to not adding Dolomite Lime to the soil mixture, and it got solved.

The AN nutes Im using at the regular dose recommended on the side of the bottle. Although I add a bit more Fulvic Acid to bring the pH down. The soil pH is approx. 6.5 (Im using a soil pH test kit from a garden center). The soil mixture is 60% promix hp and 40% perlite with liquid lime added for cal/mg. I am using the container lift method to determine watering. I am waiting until they get very light prior to adding more water. I usually water with the Nute mixture the beginning of the week, and then water once (sometimes twice) with plain ol' tap water. The tap water here is some of the finest in the country.

Any other suggestions? Or do you need more information from me?

Was there alot of phosphorus in your foliar spray? Have you been adding alot of p to your soil? What makes things tricky is that sometimes excess nutrients will make a plant look deficient and vice versa. Give more details about what your doing. How strong are your ferts and how do you mix them? Ph your using? Directions for testing are in my signature. If soil, then what is in it? Are you letting the soil dry out between waterings well? Add anything else you feel is important.

Here is a deficient plant of p according to mynamestitch. Your plant does kinda look like this though doesnt it. I would think you would be getting red and purple coloring on the leaves or on the stems or on the petioles. Is that happening?

 

[Guest]

nah, its possible to have necrotic spots w/ magnesium, just means either its very serious or a lockout. iirc, too much calcium (hard tap water?) can lock out mg, but I may be wrong about that.

 

[inc0gnit0]

WWMan.

Yeah I know K is not phosphorous. Was a little too high and didn't proof read. You ever get a little mixed up after smoking a fresh harvest... and enjoying it a little too much?

 

[edelephant]

If it is Phosphorus excess how could I solve the problem? Flush the plant? Any other suggestions or possible problems you see????

Thanks for the help

 

[edelephant]

I havent figured this problem out yet. I've flushed the plant affected but now the problem has spread to another plant. Anyone got any insights? I was planning on throwing these into flower this week, but now want to get this under control before that happens.

Thanks everyone!

 

[Xtbudda]

what kind of soil, are you using?
When i have ran into a similar problem, i usually douche the girl with a nice leech and repot to bigger pot with fresh soil. When transplanting try to remove as much soil , so the roots can suck up the new soil. Works for me, rather than adjusting this and that when it is in poor shape.