Heat Stress or Nute ??

Hey, sorry for being such a newby. Poor little babies look very ill.

- 1pt soil, 1pt Perlite
- Spent long hours on roof in hot sun (around 30 C), but have now moved to grow room 400W HPS
- No nutrients has been added.
- The soil already has some slow-release in it i imagine, but thought perlite would level this out.
- Watering a good amount i think.


What's the best way to get the leaves green again?

thank you very much for any help

Give us some more information regarding your lighting situation and watering methods.

As your leaves are yellow it's a good indicator that either a lack of light, lack of water or a combination of both. Excessive nutes will normally burn the tips of the leaves. It may also have a nitrogen deficiency as this is quite common in soil grows.

I recommend every 2 months the use of 'Urea' for your plants. Plants love a sudden burst of nitrogen, but beware.... It is quite easy to overdose on Urea and in such small pots, there is no need to give it too much. your plants will respond and love you for it.

just make sure they get good fresh air, give them water whenever they need it, as you are using a 50/50 perlite mix the water is probably draining out quick so dont go by normal soil watering schedules, work out by the weight of the pot and as soon as the pot feels light then water. also make sure the 400w hps isnt too close. what sort of humidity have you got in the tent, have you a fan moving the air around. put more details up and then you will get more help, if you had them on a roof the pot was probably cooking also, it wasnt a felt roof was it? please say no!
and for gods sake dont go pissing all over your plants, if i pissed on my plants they would never respect me again. you can do it but i prefer to fertilize from a bottle, not from my nobbly!
not that theres anything wrong with your bud hoochy, do you actually buy your urea or do you sprinkle your plants. i understand its natural but the shit we eat you dont know what your nob is throwing on the plants.lol!
lu

there's definately enough light. when they were on the roof they were getting a full day of really hot sun. maybe it's a water problem. i water them every second/third day. the leaves are a bit twisted i just notived too, like warped. there is no fan in there. i'll get onto that.

i'll try the urea. still debating on using natural 'nobbly' urea, or shop-urea. i'm sure if i eat well for a few days and stay off the booze, my wee should be pretty safe.

if it turns out that i'm not watering it enough, does that mean that if i water it daily, it will start to go all green again? they honestly look like they're dying. getting worse and worse!

you mention possibly some nute release from the soil
my guess is you should re transplant them in soil with out time release nutes check your ph bring your in soil try to be in the range of 6.5 to 6.8 as well those pots have holes in the bottom ???? if not make some and water every 4 to 5 days instead

Well, for some reason, they are being starved of nitrogen, and from what you described about your soil, it should have plenty enough N in it to keep those little guys nice and green, so I'd say your problem is elsewhere. Hmm....describe your watering habits? I'm guessing your not watering them THOROUGHLY when you water, every single spec of soil must be moist, or it's useless to the plant, for feeding purposes. I was going to say PH, but I think that if it was that far outta whack, you'd be showing other deficiencies, as well. I'm guessing that heat kept MOST of the soil dry, whether you watered them a little, or not, effectively starving them.

DrFever said:

you mention possibly some nute release from the soil
my guess is you should re transplant them in soil with out time release nutes check your ph bring your in soil try to be in the range of 6.5 to 6.8 as well those pots have holes in the bottom ???? if not make some and water every 4 to 5 days instead

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i've looked everywhere for soil without slow release. no luck. that's why i add the perlite - to weaken the blow a bit. yeah i def have holes at the bottom.

jawbrodt said:

Well, for some reason, they are being starved of nitrogen, and from what you described about your soil, it should have plenty enough N in it to keep those little guys nice and green, so I'd say your problem is elsewhere. Hmm....describe your watering habits? I'm guessing your not watering them THOROUGHLY when you water, every single spec of soil must be moist, or it's useless to the plant, for feeding purposes. I was going to say PH, but I think that if it was that far outta whack, you'd be showing other deficiencies, as well. I'm guessing that heat kept MOST of the soil dry, whether you watered them a little, or not, effectively starving them.

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yeah, when they were on the roof i suppose they dried out pretty quick. i'd usually water them at night time. now that they're under the 400W HPS, i water them about the same. once every day or two days. the top soil is always dry when i water, because i assume tehre's lots of water down the bottom. but then maybe not since the perlite and the drainage holes. do they have the look of under watered leaves?

johnny1234 said:

yeah, when they were on the roof i suppose they dried out pretty quick. i'd usually water them at night time. now that they're under the 400W HPS, i water them about the same. once every day or two days. the top soil is always dry when i water, because i assume tehre's lots of water down the bottom. but then maybe not since the perlite and the drainage holes. do they have the look of under watered leaves?

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Man, that's confusing to read.lol Anyway, follow this.... When you water, water from the top, making sure to cover the entire surface of the soil, letting it soak down through the pot evenly, soaking every bit of soil, until a tiny bit of excess water flows out your drainage holes. Don't worry about overwatering in one session, it's impossible,(unless it's a drainage issue) especially with 50% perlite added. Then, when the soil is totally saturated, let the plant sit for a few days, until approx 70-90% of the water has been used up/evaporated, and then it's time to water again. Repeat as necessary, and you'll have happy plants. Overwatering, is a failure to let the soil dry out sufficiently between waterings, and has nothing to do with the amount of water added when the plant was watered.

Basically, don't be afraid to soak 'em, as long as they are allowed to dry out afterwards.

Also,.... make sure the PH is around 6.5.

dont ever assume anything with these plants, and just because one plant doesnt need water the others might, they all have different feeding habits. dont put them on the roof again either, roofs when in the sun get very hot, in strong sun they get very warm. plants in the wild can disperse heat in the soil but when in a pot on the roof youll cook the soil.
do as jawbrodt says but make sure to check the weight of the pot daily,. dont you have a head shop or anything near you to get decent soil?. with 50%perlite they will drain out pretty quick especially in the veg stage, good luck withit anyway.
lu

^Good point, about the soil temps, I shouldn't have failed to mention that. That, was likely your main problem, because roots require an optimum temp range, even moreso than your foliage does. I can't remember what the upper limit is, but I'm sure it's well under what they were experiencing on the rooftop. It likely shut the plants down, and as mentioned, effectively cooking them. With a few good waterings, they should be looking decent again, in a week or so, now that they're back in cooler temps.

thanks for all the great advice.

got a good little fan on them, back on the mend, out of the hot sun. fingers crossed!

cheers