Can anybody identify whats the matter with this plant?

[BaldrickTX]

For the record, I have 3 plants going. I'm growing in F.F. soils and they're 3 weeks into flowering stage.

Only 1 of my plants has a deficiency on the leaves. It looks as if they're suffering from something somewhere between a zinc or calcium issue.

I'm also wondering if the lights are too bright for it, or if it's the strains genetics.

Thanks in advance

 

[RGWD0202]

What are you feeding? Ph of water and how often? Are the lower fan leaves still green or do they look similar? Picture of entire plant?

 

[BaldrickTX]

What are you feeding? Ph of water and how often? Are the lower fan leaves still green or do they look similar? Picture of entire plant?

I should point out that this is the 1st time that I've ever grown anything, so I've been winging this on common sense ( the other 2 plants look great, btw).

I'm feeding F.F. fertilizers...Big Bloom, Tiger Bloom, Open Sesme, Beastie Bloomz, and Cha Ching which I'll start next week. Also, I'm going by their chart, but at half dosages. I also give Bembe at full dosage. I give them all of that twice a week. My ph level is between 6 and 6.5
The leaves look like it all the way down but inside the plant they are mostly green.

This plant didn't look like much in its beginning. I didn't even top it. So I let it grow for the education. The other 2 plants were what I was most interested in.

I ought to mention that I have KINDLED X750 lights that I bumped up to 100% last week, and that's going by their chart.

My gut feeling tells me that it's the increase in the light brightness making the leaves turn yellow/brown.

 

[Eledin]

Thats a very potent light to have at 100% with such a tall plant. I cant say for sure cause I use low wattage LEDs but plenty of people here use those high end LEDs. Its 750W right? What is the distance from the plant to the lights?

 

[Eledin]

Also are you making sure that the light is not giving too much heat in the tent? Whats the temperature and humidity? Does it feel hotter in the upper canopy? I dont know if I can help you even though I think youre on the right track about your suspicions about the light, but these questions will help other people that can help you.

 

[OldOneEye]

I see a cal/mag issue (brown spots) and your nutrients are a tad strong. Brown, burntish lookings edges. Nutrient burn shows first on edges, Nutrients deficiency will show in the center of the leaves.

 

[BaldrickTX]

I see a cal/mag issue (brown spots) and your nutrients are a tad strong. Brown, burntish lookings edges. Nutrient burn shows first on edges, Nutrients deficiency will show in the center of the leaves.

Then I guess it's the genetics of the strain. The other 2 plants display none of the symptoms that this plant shows, and they get exactly the same feeding that this one gets.
I don't think it's a cal-mag deficiency. Looks more like zinc than that.

 

[BaldrickTX]

Nutrient burn shows first on edges, Nutrients deficiency will show in the center of the leaves.

I appreciate this info. That's something I won't forget.
Cheers

 

[BaldrickTX]

Thats a very potent light to have at 100% with such a tall plant. I cant say for sure cause I use low wattage LEDs but plenty of people here use those high end LEDs. Its 750W right? What is the distance from the plant to the lights?

This light is 1000W.
I had my doubts about going 100%, but it's the manufacturer’s recommendation, and as I know SFA about what I'm doing, I thought "they know best".

The closest plant to the light is about 20 inches away

 

[BaldrickTX]

Also are you making sure that the light is not giving too much heat in the tent? Whats the temperature and humidity? Does it feel hotter in the upper canopy?

The light fixture is at 87°. The hygrometers read between 82°-85° and 32% humidity (its always low here in Colorado), and despite 6 fans in the tent, the canopy is warmer.

 

[BaldrickTX]

The light fixture is at 87°. The hygrometers read between 82°-85° and 32% humidity (its always low here in Colorado), and despite 6 fans in the tent, the canopy is warmer.

Also, the controller for this light fixture is sitting outside. They're both attached to an 8' extension cable

 

[Blastfact]

If it's a Kind X750 it's a 750w light and should never be at 100% unless it's in the top of a tall tent and running CO2 and everything is on point. Then drop it down until the plant scream UNCLE. There are warnings in the O&M about running the light at high PPF numbers,,, Meaning cranking it up. I have a HLG 650R in my 3 x 3 and it puts out the same ppf as your light with 120 less watts because it's next level efficient. And it can get rowdy as hell if I stomp on it. I checked the ppfd numbers today with a Apogee meter and I was at 800 and only on #3 on the dimmer at 24" off the top of the plant. I lowered the dimmer just a hair and that dropped it to 700 ppfd. Which is where I want to be in late veg with this poor plant. Your plant has some nute burn and light burn. Tips of the leaves are showing just a bit high on the nutes then the massive light bleached them white as the edges of the leaves went saw tooth and got burnt on the very tips of the teeth. It is showing a clamag issue but I bet stomping on the lights brought that out. I would be looking at your nute selection and seeing which one have Ca and Mag in them and adjust my feeding to incorporate those elements more into my mix and still keeping the NPK levels geared and set for flower. Make sure your ph is where you want it with nutes mixed in water. While you may start mixing with good ph water the nute load can change the ph and then you pissing into the wind. It's a hell of a learning curve! Good Luck!

 

[Week4Bytch]

This light is 1000W.
I had my doubts about going 100%, but it's the manufacturer’s recommendation, and as I know SFA about what I'm doing, I thought "they know best".

The closest plant to the light is about 20 inches away

1000w is a lot of light. For context, I have a 720w light that I run at 75% in a 4x4 tent. And get near 950 PPFD. Might want to check your PPFD and see where your actually at.
And every light out there is recommended to run at 100% (in flower) no matter the wattage. From 150w to 1000w Recommended is 100%. Check into recommended watts per tent size.

What size grow light do I need?

What size grow light do you need? For photoperiod plants we recommend LED grow lighting of between 30 watts and 45 watts per square foot (375 to 500 watts per sq.m.) depending on your experience level. Autoperiod plants have a longer light cycle so 20 to 30 watts per square foot (250 to 350...

migrolight.com

 

[Kastame]

For the record, I have 3 plants going. I'm growing in F.F. soils and they're 3 weeks into flowering stage.

Only 1 of my plants has a deficiency on the leaves. It looks as if they're suffering from something somewhere between a zinc or calcium issue.

I'm also wondering if the lights are too bright for it, or if it's the strains genetics.

Thanks in advance

First off I would check the soil pH at the bottom of the pot. To make this easier, for indoor grows I use 5 gallon nursery pots that have little rectangular areas cut out around the base for drainage (good tip for your next grow) and that way you can insert pH probe easier because the acidity at the bottom can change much quicker than higher up in the soil. If pH is in the correct range, I would cut back on the nutes just a little, and maybe boost the CA by giving it just a calcium supplement which is available by the gallon at Amazon for a reasonable price, about $36. Even if you grow only a few plants every year, that gallon will last you about 3 seasons. I use Cal- Mag Extreme by GS Plant Foods. It does have 2.0% N in it but in the flowering stage you don't need much N and that could be your problem in part. I use Bloom Booster 1-34-32 which is $22 for 250 gms.

 

[LoveGrowingIt]

I'm feeding F.F. fertilizers...Big Bloom, Tiger Bloom, Open Sesme, Beastie Bloomz, and Cha Ching which I'll start next week. Also, I'm going by their chart, but at half dosages. I also give Bembe at full dosage. I give them all of that twice a week. My ph level is between 6 and 6.5
The leaves look like it all the way down but inside the plant they are mostly green.

Those FF nutrients tend to burn, so many folks recommend using a half the recommended dose.

I ought to mention that I have KINDLED X750 lights that I bumped up to 100% last week, and that's going by their chart.

This light is 1000W.
I had my doubts about going 100%, but it's the manufacturer’s recommendation, and as I know SFA about what I'm doing, I thought "they know best".

The closest plant to the light is about 20 inches away

Whichever light you're using, it's likely to be too much. A light meter can be helpful. I use the Photone app with a diffuser for my phone. It seems to work well.

The light fixture is at 87°. The hygrometers read between 82°-85° and 32% humidity (its always low here in Colorado), and despite 6 fans in the tent, the canopy is warmer.

That's too hot. 80º (measured near the canopy) is as high as I go.

The humidity is too low. Do you have a humidifier for the inside of your tent?

I don't think it's a cal-mag deficiency.

The brown spots look like Ca deficiency, but they could be due to excessive light or heat, though.

 

[Kastame]

What are you feeding? Ph of water and how often? Are the lower fan leaves still green or do they look similar? Picture of entire plant?

What are you feeding? Ph of water and how often? Are the lower fan leaves still green or do they look similar? Picture of entire plant?

First off I would check the soil pH at the bottom of the pot. To make this easier, for indoor grows I use 5 gallon nursery pots that have little rectangular areas cut out around the base for drainage (good tip for your next grow) and that way you can insert pH probe easier because the acidity at the bottom can change much quicker than higher up in the soil. If pH is in the correct range, I would cut back on the nutes just a little, and maybe boost the CA by giving it just a calcium supplement which is available by the gallon at Amazon for a reasonable price, about $36. Even if you grow only a few plants every year, that gallon will last you about 3 seasons. I use Cal- Mag Extreme by GS Plant Foods. It does have 2.0% N in it but in the flowering stage you don't need much N and that could be your problem in part. I use Bloom Booster 1-34-32 which is $22 for 250 gms.