Yellowing all around, room to recover?

Hi everyone,

We're a group of beginner growers and we've been having an issue with our first grow.

We have an indoor setup with GE 400w lightbulbs, and have been growing 3 pots of auto seeds (2 Bluetooth 1 AK47) since early February.

Our soil is Canna Terra Professional and we followed the attached chart for feeding.

Around day 17-20, we started seeing yellow spots in leaves. Plants were growing at a fast pace, except there was a point where the lights were too close to the plants and caused light burn, but we immediately took action and things were looking good from there.

However over the last few weeks the yellowing started growing from the bottom parts. We are now at Day 52, and the current situation is not looking good.

We used drinking water for feeding, played around with a pH between 6.1 and 6.7, and over the last two weeks we added Magnesium to our feeding solution. We also sprayed the plants with Magnesium. It seems like it has not helped as the yellowing has grown.

Based on the way the plants look, what would you say the cause of our problem is? Is there still room to recover and get a good yield out of these plants? Any feedback would be appreciated.

Thanks!

prsp1341 said:

Hi everyone,

We're a group of beginner growers and we've been having an issue with our first grow.

We have an indoor setup with GE 400w lightbulbs, and have been growing 3 pots of auto seeds (2 Bluetooth 1 AK47) since early February.

Our soil is Canna Terra Professional and we followed the attached chart for feeding.

Around day 17-20, we started seeing yellow spots in leaves. Plants were growing at a fast pace, except there was a point where the lights were too close to the plants and caused light burn, but we immediately took action and things were looking good from there.

However over the last few weeks the yellowing started growing from the bottom parts. We are now at Day 52, and the current situation is not looking good.

We used drinking water for feeding, played around with a pH between 6.1 and 6.7, and over the last two weeks we added Magnesium to our feeding solution. We also sprayed the plants with Magnesium. It seems like it has not helped as the yellowing has grown.

Based on the way the plants look, what would you say the cause of our problem is? Is there still room to recover and get a good yield out of these plants? Any feedback would be appreciated.

Thanks!

Click to expand...

I'm not an expert, but I believe yellowing of older leaves, starting low, and working it's way up, is from lack of nitrogen. Soil only sustains a plant for a few weeks at most without adding nutrition back. Get some nutes.

prsp1341 said:

Hi everyone,

We're a group of beginner growers and we've been having an issue with our first grow.

We have an indoor setup with GE 400w lightbulbs, and have been growing 3 pots of auto seeds (2 Bluetooth 1 AK47) since early February.

Our soil is Canna Terra Professional and we followed the attached chart for feeding.

Around day 17-20, we started seeing yellow spots in leaves. Plants were growing at a fast pace, except there was a point where the lights were too close to the plants and caused light burn, but we immediately took action and things were looking good from there.

However over the last few weeks the yellowing started growing from the bottom parts. We are now at Day 52, and the current situation is not looking good.

We used drinking water for feeding, played around with a pH between 6.1 and 6.7, and over the last two weeks we added Magnesium to our feeding solution. We also sprayed the plants with Magnesium. It seems like it has not helped as the yellowing has grown.

Based on the way the plants look, what would you say the cause of our problem is? Is there still room to recover and get a good yield out of these plants? Any feedback would be appreciated.

Thanks!

Click to expand...

That last photo on bottom looks like potassium deficiency

Thanks everyone, really appreciate the help. Here's some more information in case it gives a clue regarding what might be going wrong.

• Our grow room is 90x90cm with 180cm height, and we're growing 3 plants in 14L pots.
• For each 14L pot we're using 1L of water when watering (whether we're feeding or not)
• For each feed we mostly used the recommended portion size, in some cases we gave less than that (minimum portion was half of the recommended)

Questions:

• What should be the target pH for when we're flushing with plain water?
• Would it help if we lollipop the plants?
• I'm attaching a summary of our feeding schedule, how does the frequency and timings look?

prsp1341 said:

Thanks everyone, really appreciate the help. Here's some more information in case it gives a clue regarding what might be going wrong.

• Our grow room is 90x90cm with 180cm height, and we're growing 3 plants in 14L pots.
• For each 14L pot we're using 1L of water when watering (whether we're feeding or not)
• For each feed we mostly used the recommended portion size, in some cases we gave less than that (minimum portion was half of the recommended)

Questions:

• What should be the target pH for when we're flushing with plain water?
• Would it help if we lollipop the plants?
• I'm attaching a summary of our feeding schedule, how does the frequency and timings look?

View attachment 4867088

Click to expand...

I wouldn't lollipop the plants until healthy if it were me. What nutes are you using?

Here's some more photos with better look at the leaves in bottom and top parts. We are now at day 60 and we think we have multiple problems going on - possibly light burn, nutrient deficiency (whether caused by pH irregularity or other factors) or under/over watering. We've been using drinking water instead of tap water (we're located in Eastern Europe).

When we fed the plants we always used a ratio of 1/14 (water/soil). We've been following the chart of nutrients I shared in my first post. We have not increased the amount of water as the plants have grown. We played around with giving less nutrients randomly (range of 50% to 100% of the suggested chart) and yesterday added PK13/14 to our feeding solution, using 2/14 water per amount of soil.

Based on the recent photos and our history, what would you say our problems are, and how should we take action?

Thanks a lot.

Everybody has thier own style of growing/feeding. I try to keep it simple tho. 1000ppm feed every time from clone to harvest. No breaks for straight water. And when you have a fully established root system from top to bottom, feed until you see about 10% run off... every time. For 14 liters, you should be getting a liter or a little more of run off. I think you're either getting a buildup of nutes by not getting good run off, or your soil PH is crashing. Just a guess tho.

it looks like severe light burn to me. how far above the canopy, at the closest spot, is your light? if 400 watt led, it should be around 24" above closest plant top but check with mfg. the damaged leaves will never repair themselves. gl.

Ellisk said:

it looks like severe light burn to me. how far above the canopy, at the closest spot, is your light? if 400 watt led, it should be around 24" above closest plant top but check with mfg. the damaged leaves will never repair themselves. gl.

Click to expand...

its lack of nitrogen. leaves will go yellow to brown to crispy as the leafe dies

Severe deficiencies. Plural.

go go kid said:

its lack of nitrogen. leaves will go yellow to brown to crispy as the leafe dies

Click to expand...

I still believe this is severe light burn. these symptoms/leaf damage looks exactly like a grow I had when I changed lights. but just to be sure, I would flush plants and test run off for ph. in my expierence, and that isn't much, it is never a lack of some mineral, but instead nute burn or light burn. gl.

Ellisk said:

I still believe this is severe light burn. these symptoms/leaf damage looks exactly like a grow I had when I changed lights. but just to be sure, I would flush plants and test run off for ph. in my expierence, and that isn't much, it is never a lack of some mineral, but instead nute burn or light burn. gl.

Click to expand...

If it were light burn, more top leaves would be affected before the bottoms.

prsp1341 said:

Here's some more photos with better look at the leaves in bottom and top parts. We are now at day 60 and we think we have multiple problems going on - possibly light burn, nutrient deficiency (whether caused by pH irregularity or other factors) or under/over watering. We've been using drinking water instead of tap water (we're located in Eastern Europe).

When we fed the plants we always used a ratio of 1/14 (water/soil). We've been following the chart of nutrients I shared in my first post. We have not increased the amount of water as the plants have grown. We played around with giving less nutrients randomly (range of 50% to 100% of the suggested chart) and yesterday added PK13/14 to our feeding solution, using 2/14 water per amount of soil.

Based on the recent photos and our history, what would you say our problems are, and how should we take action?

Thanks a lot.

View attachment 4868715
View attachment 4868716

Click to expand...

I still say it's N def. that's causing the yellowing, but you have more going on than just that.

Sry it looks like a wreck in there, I would start over there is to much to list

I wouldn't start over-finishing this grow is a valuable learning experience. If you are using a complete 2 part like Jacks (or even 1 part like Maxibloom), you just won't see deficiencies like these if you are feeding over 500 ppm (which is LOW, most ppl feed 700+ in flower.) I didn't catch if you're using soil or coco, but I would double check everything at this point. Make sure your PH and TDS pens are accurate, do a slurry test on your media to see what is happening there, then I'd raise the PPMs of the nutrient solution and adjust it to 5.8 to start.

My guess looking at it is you did not water to runoff frequently enough. You are not running super soil, so runoff is needed even with some semi organic chemicals. Not watering fully will affect ph and nutrient levels.

As rurumo says, its a learning experience. And these are auto seeds, not photos so you are almost done. You ride this out carefully feeding bloom nutrients that contain low amounts of N. You cannot fix the N deficiency now. Leaf damage so what they will make it still. You did well for 1st try. You shot in the dark, next round you do much better.

A few people on this thread have said Nitrogen I would agree I have seen similar problems and nitrogen was part of my fix humidity for me was way to low the combo of fixing humidity and adding nitrogen had a huge impact looking good now. Check your humidity you are in flower so not more than 50% I stay around 40% in flower.

That was happening to me too until I starting adding CANNA PK 13/14. Death Race 2021.

On the other hand the plants don't look bug infested so there's that.

Rurumo said:

I wouldn't start over-finishing this grow is a valuable learning experience. If you are using a complete 2 part like Jacks (or even 1 part like Maxibloom), you just won't see deficiencies like these if you are feeding over 500 ppm (which is LOW, most ppl feed 700+ in flower.) I didn't catch if you're using soil or coco, but I would double check everything at this point. Make sure your PH and TDS pens are accurate, do a slurry test on your media to see what is happening there, then I'd raise the PPMs of the nutrient solution and adjust it to 5.8 to start.

Click to expand...

I agree. The experience learned from this grow (even though it's not looking like it's going to be overly successful), is invaluable down the road. The thing is though, we need to come to a solution, so if it happens again, the OP will know what to do.

Hollatchaboy said:

I agree. The experience learned from this grow (even though it's not looking like it's going to be overly successful), is invaluable down the road. The thing is though, we need to come to a solution, so if it happens again, the OP will know what to do.

Click to expand...

It's all trial and error, isn't it?

I'm going with potassium shortage. OP indicates using six products. You'd think everything would be covered in six products. Especially in an upgraded soil.

Moreover, the problem with soils is it takes to long to react.