Help with diagnosis plz

Hey whatsup again bros, 'i' have 3 plants -a 2 white rhinos, and a nlxbb- about 13 days into 12/12 that are juuust starting to form buds.

the nlxbbud is fine, and also 1 of the wr's, these are both indica-dominant. However, the bigger most sativa dominant one of the crop is slowely dying from the bottom up..

i know this has been mentioned many times b4 don't get me wrong but its just strange, how shes the only 1.. I've pretty well narrowed it down to under/overwatering (i feel im pretty good with this though..) Or nitrogen defeciency (have been giving them full dose of Dr.Hornbys 4-3-6 organic fert every watering.)

The specifics of this problem are the oldest leaves on the plant slowly turning from green to yellow, and then eventually dying. There are also some brown spots on the leaves that are yellowing. This is starting to get up to the bigger fanleafs so i want to stop it asap.

i have just been trying to just water and give nutrients to it like i usually would hoping that it might be stress since i had to tie it down a lil more than the other ones(?)but this hasn't seemed to work.

Should i try adding more nitrogen to it only, maybe see if it burns or heals and know if thats the problem? I only have that hornbys for nitrogen fertilizer, other than 3-1-3 which they were raised on..

Thanks to anyone who takes the time to help me with this.

peace:rasta:

hmmm well pics would help, obviously. What I can recommend is do a flush on all your plants, just in case there is some buildup of ferts in your soil that is messing the plants up. After you flush, give them some fish emulsion right away, it's high in nitrogen and the plants love it (it's organic). I can't tell you specifically what's wrong without pics, but here is a great guide with pics of every problem, so check it out!

International Cannagraphic Magazine Forums - The Complete guide to Sick Plants,pH, and Pest troubles!

hmm, i dont have a digi atm but i thought i described it pretty well, and yea the other 2 plants are fine, ive also only fed it 100% organic its whole life and less than the recommended dosage the whole time, but i will look into that fish emulsion, thanks.

If they were mine and showing signs of fert burns I'd give them nothing but water for a few days. What often happens during feeding of powdered fertilizer is the bottom of the jug or whatever you water with gets a build-up of ferts that haven't fully disolved. This gets dumped onto the last plant watered with it and can burn the roots. With having only 3 plants they're all especially important! I say nothing but straight, clean and pure water for a few days or until you see a change. But never soak them...just water as usual.

actually i think i said that it looked like nitrogen defeciency, i picked up the fish emulsion though and try that for the next few waterings. hopefully the leaves stop yellowing :/

I think you don't understand. When ferts build up in the soil, through overferting or just over time, they lock out the ability of the plant to absorb the water and the ferts in it. You see the combination of elements that feed your plant are salts which carry a tiny electric charge that attracts and repels other compounds. The salts grab on to water just like when you eat salty foods, and your plants soil is wet but it can't properly absorb the water or the nutes in it.
Flush, flush, flush, you should give just water every second or third watering anyways to let the plant use up any extras laying around.

ok.. so these are the exact symptoms that show nute lock-up? And yea i do know what they were talking about when they said nute lock up.. also i wait until the soil is almost dry (maybe a little moist now since the lights are so much furthur up.)

The over-ferting option just never really came to my mind. I mean i didn't start nutes till 2 weeks into veg, they are 13 days into 12/12right now and i have only watered like 4 times during the 12/12 period.

so should i try flushing or feeding it the fish-emulsion i just bought? anyone?

tx 4 the reply.

well i guess i got it narrowed down to two things, i hope.. :rasta:

I would flush then feed with fishys right after then water as normal next time.

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there's a great one on icmag too, it's in the plant infirmary section...

hope that helps :)

Hey, I've been having this problem in my current grow and it happened last grow as well. I'm pretty sure that its a pH lockout. Try adding hydrated lime to some water after flushing. I've read its supposed to bring the pH to around 7. I'm crossing my fingers that it will for me anyway.

can you have a look at the picure i have just posted to see if we have a similar problem?

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Originally Posted by partcleguy

Hey, I've been having this problem in my current grow and it happened last grow as well. I'm pretty sure that its a pH lockout. Try adding hydrated lime to some water after flushing. I've read its supposed to bring the pH to around 7. I'm crossing my fingers that it will for me anyway.

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hmm, it could be this because i don't have a meter. So im kindof scared to mess around with this.. but i will if salsbury has a metre i can pick up. the ph metres on ebay that use no batteries are peices of shit that don't even work. well, i think im gonna try watering with that fish emulsion this time, and if that doesn't work i will flush and do the lime.

also if its any type of watering problem i think it would be underwatering.. so i guess i have it narrowed down to either underwatering, ph-lockout, nute lockout, or nitrogen deficiency. I will try to find the prob, tx for the help guys.

p.s. get back to me on how that lime works and we can work this thing out together :thumbsup: cause i just watered with the fish-emulsion.

Hey whatsup again guys, i still have this prob after the fish emulsion :(. I'm gonna try to get some ph down from salsbury and add that to water and flush them. any recommendations on the ph of the water i should use? Thanks.

6.4

I HAVE A NEW REP SQUARE! YAY!

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Originally Posted by MrGreenFingaz

Hey whatsup again guys, i still have this prob after the fish emulsion :(. I'm gonna try to get some ph down from salsbury and add that to water and flush them. any recommendations on the ph of the water i should use? Thanks.

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did you flush your plants before giving them fish emulsion? cause nothing will really help until you flush them.

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Originally Posted by dutch.lover

did you flush your plants before giving them fish emulsion? cause nothing will really help until you flush them.

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Not yet, but tomorro if i can get off work early enough ill def be buyin some ph-down and flushing all of them with ph 6.4 water.. might as well, i'd hate to see the other 2 goin through this as well. but thanks again for the help guys, ill report back on how it turns out :cool:

to do a proper flush, you are supposed to flush with 3x the amount your pot holds. ie 3 gallon pot, flush with 9 gallons of water. Just in case you didn't know.

ps: if the water running out the bottom of the pot is yellow-ish, that's a definite sign of nute buildup. been there, done that.

Hey again, they were ready for watering again last night, i havn't had time to get down to salsbury so no ph metre yet so i just semi-flushed anyways with tapwater.. i say semi because i only got around 7 gallons in, it took like 25 mins to do this and going back and forth with a 4-litre jug didnt really go well with me.

so im gonna get one of those really big 10 or so gallon ones and use that instead, hopefully i can get a ph metre or some papers at least by then, i already picked up some sodium biphosphate to lower ph.

also yea, when i looked at the water that was drained off it had a orangish-brown tint, kinda like rust colored. so im gonna make a better contraption and get to them all hopefully, peace tx.

Yeah salt build up. Why don't you put your plants in you bathtub to flush them?

^that works really well. Put them in the tub, water about halfway up the pot or higher for about half an hour. After that, they will be super easy to flush since the soil has already leached its shit into the tub. It really loosens up the salts...you think the runoff water looks bad now, wait til u soak them.

You guys, I can not stress this enough...most problems involving spotting leaves, slow growth, and general unhealthy appearance is from the PH. Please get yourselves a cheap and easy test kit (see my recent pic for an example) and test your tap water. It's very important you narrow down or define the problem before attempting a fix.

You're totally right. pH problems=salt buildup. They go hand in hand. Flushing is the first step, to get rid of the salts. Next step is to control the pH, now that there's a clean slate (soil, lol) to work with.

yo, sry 4 the late reply, yea, the dying trend seems to have slowed from my semi-flush earlier, however, i got a ph-tester kit today and was displeased to find my water is like 7+ so yea, gotta adjust that.

Hmm put them in a filled tub for half an hour then flush? Never heard of that on, i could see why it would work though, it seems to me like it would be more stressful on them, but i think ill try it.

got back from wal-mart/the grocery store an hour ago, i didnt wanna do that thing in my bath tub so i got 3 rubbermaid containers, im gonna fill them up and 'loosen the salts' like u said and then flush, should work good :thumbsup: also i got one of those big natural water jugs, i think im gonna save it for the last part of the flushing.