slight yellowing of leaves

hey all, on my 2nd grow after the first failed lol

going pretty well so far, they all seem fine apart from this one plant that's getting a few yellow spots on it, 1 more plant might be very very slightly yellowing on the tips a bit but you have to look real close, want to catch it before they die like last time

maybe it's time for nutes? they're 3-4 weeks old now.

160w CFL lights (125w grow light and 2 household CFLs) adding more this week.

18/6 light cycle



here's the star of the show my best looking plant





plus rep and thanks for any help and advice

If they are 3-4 weeks hit them with a very very low does of veg nutes. 1/4 strenght or less. slowly up your nutes as your grow progresses.

They still seem a bit small for 3-4weeks so be careful with the nutes, dont over do it, you could damage them. but it does look like they are wanting a small bit of feed.

figtree said:

If they are 3-4 weeks hit them with a very very low does of veg nutes. 1/4 strenght or less. slowly up your nutes as your grow progresses.

They still seem a bit small for 3-4weeks so be careful with the nutes, dont over do it, you could damage them. but it does look like they are wanting a small bit of feed.

Click to expand...

+ rep

cheers yeah they are kinda small, tbh i think they're just 3 weeks not 4 but i dont remember when i put them in, may also be down to not enough light too which ill be sorting this week.

read up a lot today and already decided 1/4 strength should be enough for now, am i right in thinking i feed them every time i water them.. so once every 2 days?

thanks again all RIU

I personally alternate nutes one day and use molasses water the next. I also water everyday,but I dont water them too much.I use about a gallon of water for the group of 5 ladies in my flower room,which is just enough to wet the trays on the bottom for a few minutes until the vermiculite in my soil mix can suck up the extra moisture.
Just make sure the cfl's arent burning your leaves from being too close to the plants.

UKstoner said:

hey all, on my 2nd grow after the first failed lol

going pretty well so far, they all seem fine apart from this one plant that's getting a few yellow spots on it, 1 more plant might be very very slightly yellowing on the tips a bit but you have to look real close, want to catch it before they die like last time

maybe it's time for nutes? they're 3-4 weeks old now.

160w CFL lights (125w grow light and 2 household CFLs) adding more this week.

18/6 light cycle

here's the star of the show my best looking plant

plus rep and thanks for any help and advice

Click to expand...

UKstoner,

To me those plants look like they're currently a little dry and like maybe that they haven't really been given all the water they need to flourish good so far.

You need to keep all the soil in the pot moist all the time. I think this generally accepted idea of letting plants dry way out between waterings is a bad idea.

You're at that stage where those plants need to be developing a good root system. But roots won't grow out into dry pockets of soil. And if you develope dry pockets of soil down in the pot they don't re-wet real easy with a standard watering.

If those plants were mine I think the first thing I'd try is giving them a good soak. I'd set them in the sink one at a time and slowly pour a gallon (or more) of water thru them. I'd also add 2 or 3 drops of dish soap / gallon to the water to act as a wetting agent. Then after that I'd never let them dry back out as far as they appear to be in those pictures. Every time you water (whether with added nutes or not) you need to pour enough on the plant that a substantial amount runs out of the bottom of the pot. (I just used 5 gallons of water to water several plants and I got at least 1.5 gallons of run off.)

You didn't say what potting soil or mix you were using but if it's one of those commercially available ones that comes with some nutrients already in it then I wouldn't think that you have a nute deficiency just yet with plants that are only that big in that much soil. More likely I would suspect that you don't have a good enough root system out into all the soil that's there so the plant can get to those nutrients.

Any how, hope this helps.

Jack

Jack, thanks for the advice, just done exactly what you said and will be sure not to let the plants dry out again, think i was a bit cautious with watering since my last were a bit over watered.

next watering (not tommorow but next day) im hoping to add nutes at 1/4 strength, and will add 'em every watering

also thinking of getting this for some extra lighting power http://cgi.ebay.co.uk/65w-Blue-Spectrum-6400k-CFL-grow-light-lamp-bulb-BC-B22_W0QQitemZ190372042743QQcmdZViewItemQQptZUK_HomeGarden_Garden_PlantsSeedsBulbs_JN?hash=item2c530ed7f7

UKstoner said:

Jack, thanks for the advice, just done exactly what you said and will be sure not to let the plants dry out again, think i was a bit cautious with watering since my last were a bit over watered.

next watering (not tommorow but next day) im hoping to add nutes at 1/4 strength, and will add 'em every watering

also thinking of getting this for some extra lighting power http://cgi.ebay.co.uk/65w-Blue-Spectrum-6400k-CFL-grow-light-lamp-bulb-BC-B22_W0QQitemZ190372042743QQcmdZViewItemQQptZUK_HomeGarden_Garden_PlantsSeedsBulbs_JN?hash=item2c530ed7f7

Click to expand...

UK,

Your welcome.

I don't think that plant will need watering again for several days, may be as much as a week. That's not much plant yet for that sized pot. Since you've just watered it (thoroughly I hope) and have the soil holding as much water as it possibly can, pick that pot up and hold it and try and get a good feel for how much it weighs. Then when it starts feeling light again you'll know it needs watering. This is mostly how I determine when my plants need watering.

You just can't put these plants on a set schedule and say you're going to water them every other day or every Monday and Thursday, etc. You have to do it when the plant needs it. and as a plant grows it's needs keep changing. The same thing applies to feeding it nutes.

And speaking of nutes.... if I were you I'd hold off a little longer on starting to feed that plant anything. Give it some time to let those roots develope and grow out and find what's already in that soil. I really don't see any indication that those plants are lacking any essential nutrients yet.

I think the next best thing you can do for those plants is get them a little more light. 18/6 is a good light schedule for them.

Jack

i had a similar thing on my seedlings, slight yellowing...turned out to be heat stress. improved circulation and yellowing stopped and new leaves where fine. jus double check the cfl's aint too close to leaves. Is there any air movement around you plants?

UKstoner said:

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also thinking of getting this for some extra lighting power http://cgi.ebay.co.uk/65w-Blue-Spectrum-6400k-CFL-grow-light-lamp-bulb-BC-B22_W0QQitemZ190372042743QQcmdZViewItemQQptZUK_HomeGarden_Garden_PlantsSeedsBulbs_JN?hash=item2c530ed7f7

Click to expand...

UK,

I just checked that link and that's what you want for the vegatative stage (that Blue spectrum).

Keep an eye out for some of the more Red spectrum bulbs (3000k to 4500k). You'll want to use them when you switch to 12/12 and begin flowering. But you're still weeks a way (may be even a month or more) from getting to that point.

Jack

yeah i guess your right about set schedules, that's what i was doing with my first grow, they were drying out fast though but i've sorted that out.

i done the same with all 5 plants so they've all had a good soak and the water allowed to come through the bottom.

just ordered the light off ebay i linked too before, another 65w blue spec 64k should do the trick.

will have 218 watts instead of the 152 watts i have at the min.

thanks again for the great advice, Jack.

Covert Ops said:

i had a similar thing on my seedlings, slight yellowing...turned out to be heat stress. improved circulation and yellowing stopped and new leaves where fine. jus double check the cfl's aint too close to leaves. Is there any air movement around you plants?

Click to expand...

Covert Ops,

Good point. If he doesn't already have a fan he should get a small one and keep a gentle breeze moving those plants around day and night.

Jack

ayee, i jus added a 8CM pc fan, wired it to an old phone charger, worked wonders for small seedling stage. Then jus use a bigger desk fan or summink for when there abit stronger. Also if thers no air movement (like enough to gently move the leaves of the plant) you end up with weaker stems that somtimes cant support the leaves weight!

missed your post covert_ops

yeah i've done the same as you and wired an old pc fan to a phone charger plug which moves them around nicely

Jack in the Bud said:

UK,

I just checked that link and that's what you want for the vegatative stage (that Blue spectrum).

Keep an eye out for some of the more Red spectrum bulbs (3000k to 4500k). You'll want to use them when you switch to 12/12 and begin flowering. But you're still weeks a way (may be even a month or more) from getting to that point.

Jack

Click to expand...

great, my 125w main grow light is a dual spec so i'll flip it to the red 27k spec and add some household CFLs for extra lighting that are also 27k warm white bulbs

works a treat

so dyas think the slight yellowing was just down to them being too dry? looks about the same today but i haven't had a proper look,

my best plants sporuted another 2 leaves and looked much better again

still small yellowy/bornw spots on one plant and slightly on the other, also on one there's a really small tip of brown on the leaf, fed them for the first time today so hopefully that will bring them back to perfection, they looked pretty good at the min..