Cold temps can do this? Looks like sunspots

Hey all,

Below is a picture of some of my leaves. I went to bed not noticing anything wrong with the plants. It was a cool night (around 65; usually 70 or so). When I woke up I saw my leaves looking like this. I water it every two or three days and it's been about a week since it's last nutrient dose (mostly nitrogen). This is an indoor plant that is 16 days into flowering.



Thanks for the help.

Regards,
GG

Its not from the cold.

What's your pH? Check soil and then check runoff. Also, no need to give any more N, especially if it's flowering now. that's not from cold, looks like a deficiency, possibly caused by lockout from pH of the soil/water or too much of one kind of nute in the soil (like nitrogen)

Below is a pH/nute test that I took about a month ago. Everything seemed okay except the nitrogen levels; hence why I hit it right before flowering (I was thinking maybe just a little to get it though the first stages of flowering).

You think that maybe I still don't have enough nitrogen? Would that cause similar results?

I can test again if need be but with school it might be a bit before I can get to it.

Anyone else have any ideas?

Maybe P or K deficiency?

Dude - How close is your light to the plant? I start my plants indoors and finish outside. When my light is too close they start to look like that - brown and spotty. You may want to raise your light several inches. Chems look ok for flowering...

I was told the HPS light is hotter than the MH. So if you switched the light from veg MH to flower HPS and didn't raise it up a bit, that may be causing the problem. Looks like heat stress..

Where did ya get that test kit at?

Dirtyboy said:

Its not from the cold.

Click to expand...

I agree that not a cold problem maybee look into epson salt and
check ph and did you spay your plants as the light was just starting up
it can burn your shit

i had the same problem its deff ph problem if you check ph before you add nutes say it will be 7.0 then add nutes will be 5.9 or something like that as i was new to this growing i ph'd water then added nutes then i found i was getting brown rusty looking spots i did a flush with 3 x the pot size of water ie 10 liter pot = 30 liters of ph'd water and gave it a little feed by putting nutes in water then checking ph i gave alg a mic bio grow small amount like half dose bio bloom full dose 2 drops of superthrive and some molasses it done the trick was 2 weeks into flowering an still yielded 4 1/2 ozs off 1 plant i could be wrong as i have only done 1 grow but this is what fixed my problem with brown rust looking spots hope you figure out whats up peace

I'm betting that you have the beginnings of a Ca-Mag deficiency. Give them a shot of Epsom Salts for now, and go get some Cal-Mag

You definitely aint low in either P or K according to that test. It shows you lack N. With the levels of P & K you're showing, you want to add something with high N and little to no P or K. Fish emulsion (5-1-1) would do the trick, but it stinks all to hell. There are other choices that would work as well, I just cant think this early.
Also, not knowing your nutrient regimen, I would most definitely be feeding CalMag at least every other water. I use it every water.

I decimated my first two crops because of a cal deficiency. Looks for all the world to be nute burn. And it starts right at the second week of flower.

pH could be a factor, although all the votes aint quite in on how much it (pH) affects soil grows and organics. You wanna check your solution after you add nutes until you get to know the stuff you are using. My water is right at 7.6 to 7.8 out of the tap. I add my nutes and it gets to right at 6.8 to 7. Thanks to Tim McVeigh, most fertilizer companies now derive their Nitrogen from urea, and it's acidic so it lowers pH. You'll wanna be keeping an eye on the run-off water pH. That's what will tell you whats going on inside.

I cannot understate the importance of Cal-Mag. My first two grows were decimated at the same point, right at the second week of flower, when they first showed signs of "something" that looked a whole lot like a deficiency (or nute burn). Come to find out that's when they need a lot of Calcium and Magnesium. Epsom Salts would be good for the time being (1 Tbsp per Gal), but def get some cal-mag (I use the Botanicare, it's less expensive.

At 65 you aint got a problem. My room gets to 50 or so regularly. However cold(40 or below) COULD have been the problem. Cold will cause nutrients to lock out, just like high or low pH. (I just recently learned that!!!), and nitrogen seems to be one of the first to get locked out. I doubt this is the case here, as your test showed little to no N in the soil. In a lock out, the element would be there aplenty, just not in a form usable to the plant.

You could have any number of things going on, but I'm going with the CalMag deficiency.

Hope this helps.