First grow, plants started to show some issues.

Hey all!

First grow and everything has been smooth sailing untill now. The leaves have started to taco (the upper most leaves) and started to show brown spots and drying up (see picture)

I water my plants with PH'ed water down to 6.5, I use nutes (biobizz bloom) every other watering (water - nutes - water etc) and I make sure that I have runoff whenever I water to prevent excessive salt buildup.

I'm thinking Mg deficiency, which can be if the soil is making the water too acidic.

the one picture you show looks like phosphorous deficiency, but its impossible to say from one picture. pics of the whole plant , details about what medium you're using, what lights, the rh, the temps, would all be helpful in accurately identifying the problem

Roger A. Shrubber said:

the one picture you show looks like phosphorous deficiency, but its impossible to say from one picture. pics of the whole plant , details about what medium you're using, what lights, the rh, the temps, would all be helpful in accurately identifying the problem

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I'll get a pic of the whole plant tomorrow then!

Medium: Soil (70%) with 30% perlite mixed in.
Lights: PlatinumLED P4XML2
RH: Around 60-70%
Temperature: Around 22-23C

One thing though, I think I might've done wrong. According to the dosage instructions from biobizz it's about 4ml of bloom per liter of water. Since I fill my bucket of 10L to the top, I put in 40ml of bloom in there. However when I test the ppm of it, I get about 300-350ppm when i've mixed it about. Since I give each plant about 3.5 liters of water per turn, that's about 1200ppm of nutes every about 3-4 days. Is that the correct way to give plants nutes?

if you're using bloom nutes then you shouldn't have a phosphorous deficiency... although it does look like it. are the bottom leaves dying?

and yeah we need more info like stated above

zubey91 said:

if you're using bloom nutes then you shouldn't have a phosphorous deficiency... although it does look like it. are the bottom leaves dying?

and yeah we need more info like stated above

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Yep, my thoughts too! The bottom leaves aren't showing any symptoms from what I can see.

I wrote a lot more info in my reply above, a picture of the plant will be posted tomorrow!

mixchemical said:

I'll get a pic of the whole plant tomorrow then!

Medium: Soil (70%) with 30% perlite mixed in.
Lights: PlatinumLED P4XML2
RH: Around 60-70%
Temperature: Around 22-23C

One thing though, I think I might've done wrong. According to the dosage instructions from biobizz it's about 4ml of bloom per liter of water. Since I fill my bucket of 10L to the top, I put in 40ml of bloom in there. However when I test the ppm of it, I get about 300-350ppm when i've mixed it about. Since I give each plant about 3.5 liters of water per turn, that's about 1200ppm of nutes every about 3-4 days. Is that the correct way to give plants nutes?

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yes...and no. first thing, nute manufacturers are notorious for having their number too high on their feed charts, they want you to use more so you buy more. start at about 50-75% of what they say to use and adjust from there.
ppm arent cululative, so if you feed 600 ppm twice a week, its not the same as feeding 1200 ppm once a week, if you're feeding 600 ppm, its 600 ppm no matter how often you feed it. (not that you can't feed it way too often, just doesn't make it more when you do).
otherwise sounds like you're doing ok, give the soil time to dry out pretty good between waterings. 3.5 liters sounds like quite a bit, how large are your pots? that ought to be enough for a fast growing plant in a 5 gallon size container

Roger A. Shrubber said:

yes...and no. first thing, nute manufacturers are notorious for having their number too high on their feed charts, they want you to use more so you buy more. start at about 50-75% of what they say to use and adjust from there.
ppm arent cululative, so if you feed 600 ppm twice a week, its not the same as feeding 1200 ppm once a week, if you're feeding 600 ppm, its 600 ppm no matter how often you feed it. (not that you can't feed it way too often, just doesn't make it more when you do).
otherwise sounds like you're doing ok, give the soil time to dry out pretty good between waterings. 3.5 liters sounds like quite a bit, how large are your pots? that ought to be enough for a fast growing plant in a 5 gallon size container

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Hm alright. But then, if I use 50% of the rec. dosage from the manufacturer, that gives me 20ml (for 10L of water) and that shoult cut me down to about 150-175ppm. But one thing I've never understood is how much to water them? If i soak them, does that give them nuteburn? If I just give them a bit, is that not feeding enough? How much water should I give when it has nutes in it?

doesn't matter whether its got nutes in it or not. you always water the same.
you're using soil with a decent amount of perlite. you want to wait till the pot starts to get very light. stick your finger down the side of the pot, forget that second knuckle shit, if you feel any wetness, wait. then learn how light the pot is when its that dry, then you can quit stickin your finger in it and just feel it. you want to water till you see just a little coming out of the bottom of the pot. use a can with a spout and move it around, get it all over and give it time to soak in, don't dump a gallon of water in a pot and walk away. put them in saucers of some kind to catch the overflow, and empty the saucers, don't let them sit in a pool of water. thats about it. the only time you do anything different is if you need to leech that pot for some reason, but if you water like this you shouldn't have to.

and the 50% nutes is just a starting place. it seems obvious that the recommended amount is too much, or we wouldn't be havin this chat, back off maybe to 75% and see if that helps, if it still seems like to much, back off a little more.

Roger A. Shrubber said:

and the 50% nutes is just a starting place. it seems obvious that the recommended amount is too much, or we wouldn't be havin this chat, back off maybe to 75% and see if that helps, if it still seems like to much, back off a little more.

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Fair enough! I can't really argue with that logic. Anyways, here are some pictures. Some of the upper most fanleaves have been hit hard.

I've searched around on the internet and found that phosphurous deficiency fits the bill on the issues i'm seeing on the plant now. I'm guessing most of the leaves that have curled up are beyond saving but, will that damage the plant in a serious way? Since it's flowering and is supposed to use all the energy for bud production - will this affect my yield in any huge way?

depends on how bad it is. if you're searching around on the internet, look up "nutrient lockout causes" and "mobile and immobile nutrient deficiency signs and causes"

your plants doesn't look that bad, fix it now and you ought to be alright

I've tested the run off water from the plants. It varies between 900-1200ppm (one plant had 900ppm, the other 1050 and then the last 1200ppm) with a PH reading of about 6.15

I've since flushed and tried to get the PH up (flushed with ph 7.2) since that PH in soil is quite low from what i've read.

you're feeding too much.