the bud father

hi all
can anyone help it seems when my plant's get to two to three weeks old they appear to get nute burn and start to get very unhappy but if flush they respond and then carry on as if nothing has happened
but the best part is this it happens to me every grow
i started with a soil/compost setup no added ferts ..........burnt leaves
this went on for a year or so with each new grow but did get ph correct as bought ph meter
so the next time in soil no gadgets just pots..........burnt again
[note under flo]
so went out and bought auto pots[i know you guy's hate them]
and blow me two weeks or so into grow nute burn again
but i had used the max amount rec by manufactorer hhmmm
so the next grow used only half and you guessed it burnt again
the only thing i aint got is an ec meter or the knowledge of correct ratios/ppm needed for the different cycles in the plant life


my setup is as follows
4x auto pot
40 litre nute tank heated to 20c as cold here this time of year
600 watt hps set to 18 hours on at present
3x3 foot by 4 foot tall grow room
canna coco medium
canna coco ferts
ph test ph is at 5.5-6.0
air injection to roots
room heated with oil filled rad when lights out night temp 18 c
{note oil filled rad is kept warm by light}and absorbs some heat
room temp lights on is 27 c
humidity not known yet but this has happened all year ??
room is in loft but is fed air from house via extractor fans fitted into airing cupboard so has cool air in summer and warm in winter
internal fans to provide breeze across plant's

can anyone help please i am new to hydroponics that is what i am led to believe my setup is.. any advise will really help me
cheers guy's

skitzo63

this could be your problem. you are gussing at the strength of you nutes in you system i don't reccomend it, as if you wanna ward off burn you need to moniter the fluxuation of nutes in the system. if they start to rise, burn will happen more sooner then later. if the strength is decreasing, you know they are approiate.


also, what is the RH of your environment. low RH conditions can cause your plants to over transpire then burn. it happens to me all the time since i live in a very dry climate. really, in your grow chamber RH can stay virtually the same all year round.

if you really wanna solve your problem, you need to test the reasons that it is happening, and i suggest you start with these two aspects

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HydroSan

Hi Bud father, welcome

As skitzo says, an EC meter, and humidity meter (hygrometer) should help quantify the issues Check the pH and nutrient strength thread stuck at the top of this fourm when you get an EC meter And check the EC/ppm/TDS link in my sig for clues on how to use itl

RH (relative humidity) should be above 70% in veg, decresing to less than 50% during the latter half of flowering to reduce mold issues

IMO, that is what caused your burn episodes Nute manufacturers always quote the highest possible EC, I often wonder weather they have a 30ft plant just to test their highest strength

e.g. Canna state an EC of 1.0 - 2.0 on their Aqua range, if I applied nutes at 2.0 EC, the plants would fry White widow would have to be of Jamesgang proportions to take an EC of 2.0 IMO, i.e. HUGE Sometimes less is more, specially when it comes to nutrients

Take the lower figure quoted on the nutes, and use half of that to start them off, don't increase the nute strength until they look a little pailer green, and then only increase it by 1/4 strength of the previous mix, and that should see you through until you get an EC meter

San

the bud father

thought it may have something to do with the fact i havent got a ec meter or a humidity gauge thanks for the info going shopping at the weekend will let you know what the reading's are thankz again

pfrtheotherside

Hi bud;

Ok I may be wrong on this but if so would some of you senior grows jump in and let me know.

My understing that when it comes to nutes - is that plants that are only two weeks old, soil or hydro, real don't need them this early. They are so young and tender that they can get burn very easily.

Good luck. TOS

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skitzo63

my rule of thumb on this POT is that i start my nuting regime when the roots have hit the res. once they have a couple roots in the pool they are due for a weak nute solution to help them get more in there, and help them start their veg cycle.

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the bud father

sorry if i wasnt clear in my question but this happens to me with soil and canna coco and when i used soil i didnt add any ferts for at least 6 weeks into the grow and only a small amount

my problem is when they are 2-3 weeks old the appear to have nute burn
for example the two older girl's are in their third week nearing the forth
and they have rolled leafs with dry crispy edges in the older leaves and since
i have flushed them new growth darker green instead of lime green with new growth looking a lot better /flushed to day's ago before burn got really bad
now i have one baby at one week nice colour leave formation and growth
but when i gets to 2-3 weeks old burn appears on leaves

what i think may be happening with this coco medium is im using ferts from the point of sowing so what may be happening is the water is evaporating from the coco and leaving the fert's behind i will try no ferts next time or cover the coco to prevent water evap

i did read in a thread/link from one of the mods that they use wet towel's in their room to improve humidity so i now have traty's of water with towel's added to increase humidity i dont have a hunidity tester but from what the mod was saying he was only getting 63% with the wet towel's so i can only imagine that mine is proably only about 40% max before adding the towel's
i also have no fan to control heat in the room yet waiting for pay day
so the dor to the room is slightly open which i feel is also lowering the humidity as air is just riseing up with water in it

i will get a gauge it the weekend and post my finding's
but any other advice will greatly help

the bud father

sorry about the delay in my response but the reading's are as follows

RH humidity was at 29% light's on 56% light's off
ec was at 1.3 with background ec at 0.5 = ec 0.8
ferts state rec ec 1.3 - 2.3
ph was to low between 8 and 9 only got vile type test using fluid.
this four day's ago

conclusion
ph was causeing ph lockout.could have been mg deficiency + N as well
and all other important chemical's
low nute's in tank could have caused nitrogen deficiency + mg as well
and all other important chemical's
RH @ 29% could cause the burn due to plant's transpiring to hard leaving nute's in leafes as water leacausing burn

am i correct in my conclusion, any comment's please let me know

action taken

flushed plant's and nute tank with ph of 5.5 water

added to lenght's of gutter capped at each end with towels laid in water at same hieght as top of pot's to improve RH at 60% better but not enough so added two wet towels to grow room now at 69% close enough

correct ph and nute's levels, i,e ec at 1.8, which = 1.8-0.5 background =ec 1.3 of nute's
ph at 6.0 - 5.0 nearest can get with current test kit will up grade soon

now that was four day's ago and already plant's look nice colour returning to the leafs and growth is fantastic started LST on the two 28 day old's and the 10 day old looks the best seedling ive grown to date massive leafs for it's size really healthy approx 8 inches across tip to tip
thank's all of you that have taken the time to help my garden thrive with outstanding result's
my plant's have been through the war's with me for approx two years now and i cant wait for this grow to flower just the thought of how the will look with massive buds covered in snow,but with my new found knowledge this could actualy happen

someone mentioned a journal how do i do this,i have got digital camera so want to post pic's with my journal

420buzz

I'm having the same problem. These are from seeds. I can't even think about clones until I take care of this problem first. I think it may knock out about half of the plants. Some of plants show red stems which I thought means lack of nutr. but most show the brown spots. I've been using flora nova grow about 450-500 nutr. 5.5-6.0 ph. I do have to raise the ph cause the RO. the RO drops the water to 70ppm and 3.7ph. I also use about 30ml of H2O2 for 10 gal res.There are a couple of things that need some addressing. the humidity is only at 40 to 50% and thats with a new humidifier running at top speed. The temp. is to high too. 85f day and 75f nite. I think winter time will take care of that soon. I never had this problem until I up graded my lights to (2) 600w hps going from (2) 400w hps. I have a blower set up to each light to suck out the heat from the reflectors. each light also has glass to help keep the heat in the reflectors. I going to change the water soon and drop the nutr. to 350 to 400 ppm. I'm also going to get another humidifier to bring the humidity up a bit. I hope it clears up soon. I'll check back for updates. later, G