Bit of crispy yellowness at end of leaf tips

Hi,

these plants are indoors, in 5g pots with coco and perlite 2:1, 3 or 4 weeks into flower. I'm watering twice a day for 2 mins a feed (6mm feed). Feed is 1.25ml per litre of bloom (4-8-7) and 1ml per litre of "grow green" from Professor's Nutrients coming in at 740 ppm (water is 40ppm).



I'm getting a pretty small bit of yellowing on my leaf tips. The one plant I hand water doesn't have any of these issues so i'm thinking its over watering. What do you think?

Technically it's not 'over watering' it's nute burn. Too much nutes in your water.

So I should dial back the ppm or the watering? The ppm with the bloom alone was 540ppm (-40 for the baseline).

worldspawn said:

Hi,

these plants are indoors, in 5g pots with coco and perlite 2:1, 3 or 4 weeks into flower. I'm watering twice a day for 2 mins a feed (6mm feed). Feed is 1.25ml per litre of bloom (4-8-7) and 1ml per litre of "grow green" from Professor's Nutrients coming in at 740 ppm (water is 40ppm).

View attachment 3975537 View attachment 3975538

I'm getting a pretty small bit of yellowing on my leaf tips. The one plant I hand water doesn't have any of these issues so i'm thinking its over watering. What do you think?

Click to expand...

ok so your bloom is 4-8-7

what are the npk numbers for the grow?

also whats the calcium and magnesium % info for each bottle?

do you check your PH?

a picture of the entire plant would help

Hi im4satori,

Thanks for your reply.

My grow bottle is 7-4-10. Its cal/mag is 4/1.5
Bloom cal mag is 4/2

I dont have numbers for whats in "Grow Easy". It just says added magnesium, calcium, nitrogen and iron, i'm using half the recommended strength. I check my PH at least once a day and i've never let it go over 6.2 and usually set it back to 5.7-5.8.

Pics of the whole plant that arnt super purple are a bit hard. I bent those two above out of the tent door to take a pic of them.


They're sleeping atm, i'll try it get a more complete pic this evening.

I need you to confirm that both your grow and bloom have all the essential micro nutes in them??
if they both do then;


full strength veg
per gallon
5mls to 6mls (max) grow
3mls calmag
1/8 tsp Epsom salt (or 0.5 grams)

id run it at 5mls per gallon unless it looks like it needs more

full strength bloom
per gallon
8mls bloom only

nothing more needed

another option for bloom would be
per gallon full strength
2.5 mls grow
5mls bloom

the first bloom option has a much higher P amount so you might mix

2.5 mls grow
5mls bloom

for the first half of bloom

and then 8mls bloom only for the second half of flower if you want to boost the P

slow down the nutes a little. she will be okay

Thanks, are you saying my leaf tips are caused by a lack of nutrients?

5mls per gallon is about 6% stronger than I am using currently. 8mls per gallon is about 65% stronger (would probably be over 1000ppm). I'm using 4.7mls per gallon at the moment.



Shot of my bloom analysis.

ah

you got the GH floranova
good stuff
ya man its an all in one its got everything in iy no need for muc more

ya give it the full strenght

I use GH flora nova too. that shit is good and concentrated! A little bit o nute burn its not a big problem but I recomend you to lower your nutes a bit. its better to fix lacking than fix burning.

Yah not sure why they are trying to give advice on nute deficiency but that doesn't appear to be the case. As I stated before it's nute burn. Just tone down the nutes if you're at half strength switch to 1/4 strength.

Ok thanks everybody. Id like your replies but i dont think I can (coz new?).

What i have seems to match this pick of over-fertilization here, though mine is really "just the tip" and nothing on the sides. I can't link the source, these new account rules are annoying.


It seems like too much nutes is the cause. Bit of a shock to me considering how far I am from the "recommended" concentration. I just did a fresh reservoir so I might pour another 5lts (like 1.3gallons) (started with 50lt) in to dilute it a bit. I'll have to wait for new leaves though to see the results.

When would I need more nutes, just for bigger plants?

the amount I recommended is only EC 1.2

I suppose if hes got an extremely nute sensitive plant maybe but even that's a safely low EC

but I could be wrong I suppose

but currently hes only feeding something around EC 1.0

not sure how he got nute burn with that
I can feed 8 to 10" plants that much without nute burn and I feed a low EC by most standards

It's too high ppm. Question - when you say 740 ppm - is that 500 scale or 700?

740 doesn't seem high for bloom, but different strains it could be.

FennarioMike said:

It's too high ppm. Question - when you say 740 ppm - is that 500 scale or 700?

740 doesn't seem high for bloom, but different strains it could be.

Click to expand...

based on my math it looks to be the 700 scale

the amount hes mixing is only EC1.0 on a nutrient calculator
hes got 40ppm source water and the final mix is 740ppm so all the math adds up the way it should

I just cant imagine nute burn if hes only feeding that small amount.... hes got no clawed leaves that I can see... under feeding can also cause that minor tip burned look

but again I could be wrong...maybe hes got a freak plant that's crazy sensitive... more sensitive than ive ever come across but that's ok

the good news is his fertilizer is balanced
the floranova and floragrow is good shit

how many watts and what type light/bulb?

Hey growers.

Im not sure what you guys mean by 500 or 700 scale.

My water was 40, the nutrients account for about 500ppm. The remainder is the cal-mag. My reservoir was made up with 50lts. 62.5ml of bloom and 50ml (50% of the label recommendation) of "grow easy" cal-mag supplement. Last night I diluted what was left with 4 more litres which dropped the ppm by around 50. Next reservoir i'll probably leave the cal mag out.

I've also reduced my watering to one at 9.30AM for 1 minute only. And it gets another 2 minutes water at 6.30PM. Plants sleep from 5AM to 5PM. The pump does 1200l/m and its currently servicing 7x6mm feeders. I doubt this math is accurate but 1200/60 is 20. 20 / 7 is 2.85 so... in theory each plant gets 2.85lt in feed one and 5.7lt in feed 2 - 8.56 litres per day. As I said I dont that math is reliable, its probably less. The pots are those fabric ones (geo pots) 5 gallons/19 litres.

I can't detail the strain unfortunately. When I got the equipment i was going to have to wait a month to smuggle some seeds in so I just used some old seeds I got in a bag once (all from the same bud). Next grow will be this: https://www.marijuana-seeds.nl/pineapple-kush-feminized.

The light is a Kind XL 750. Thats a 438watt led array which has 3 channels of control, red, blue, white (includes UV). They are running at 100%, 75%, 100% currently. I could raise it a bit more (maybe half a foot) but its getting to that last foot of space and pretty hard to get to now. I am seeing the tip burn in leaves at the top but also further down.

Could it possibly be a build up in my coco vs the strength the nutrients right now? It had a light flush 4 weeks ago.

In 5 hours or so I might cut off a few affected tips and take some proper photos under good light. I did fine one leaf where the burn had move a bit down one side.

the only way I could imagine you could get salt build up or over feeding using so little fertilizer is if your not getting any run off when you water

you said you where watering 2 min at a time and now your water 1 minute

you need to make sure theres enough water going thru the pot each time you water to achieve at least 20% run off from the bottom of the pot to wash out the old salts

so does your system recirculate the water or does it drain to waste?
heres how you manage your reservoir or waste water

if the ph is going up and the ppm going down your under feeding
if the ph is going down or the ppm goes up your over feeding

Ideally your ph will climb slow and your ppm drop very slow then your in the sweat spot

but reservoir size comes into play with how fast the ph will rise.. a smaller reservoir the ph will rise faster than a larger reservoir if your using a recirculating system


so test the ppm and ph of the drain water and keep a log each day to see what its doing