What deficiency could this be please?

My lower leaves started to show signs of deficiencies. I use advanced nutrients micro grow and bloom (ph perfect) I ph my water to 6.8. I fed it on Thursday with 2ml/L of each and fed it again today same amount but also added 0.8ml/L of biobizz calmag as I saw that it might be a magnesium def but I want to double check and get someone else's opinion on this. First pic is today and last two pics are yesterday. I did a soil slurry test yesterday by grabbing some soil from the middle of the pot and mixed it with equal part water at ph 7, left it to settle for 10mins and then I strained it. Ph came back to 6.5. I also checked runoff ph today after feeding and it was about 5.5 but I heard that runoff ph is misleading. ThanksT

I've use the same nutes for over 20 years and from what you've posted I think it's more of an excess than a deficiency. You're feeding at a pretty high rate for so small a plant. I feed large plants 2ml/L one time then just RO water the next time so averaging 1ml/L. You're doubling that and then adding CalMag with more N so it could be a form of burning called toxic salts buildup and I highly suspect it is.

When you say you pH your water to 6.8 is that before you add the nutes to it? What type of water are you using and what's it's pH and ppm? If it's fairly hard tap water you shouldn't be using CalMag. Teh nutes have that in them and too much Ca blocks some others.

I've always only used RO or distilled water and NEVER checked the pH once AN went pH Perfect either in DWC or soilless ProMix HP. You should never adjust the pH of your nute sol'n after mixing or you screw up the pH Perfectness of it and that could be an issue as well.

You might want to switch to a 3-2-1 ratio, (GMB), in veg then back to 1-1-1 with a dash of Big Bud just a week before flipping to flower.

I'd run some extra water thru the pots to reduce nute levels a bit and skip a feeding.

Good luck!

OldMedUser said:

I've use the same nutes for over 20 years and from what you've posted I think it's more of an excess than a deficiency. You're feeding at a pretty high rate for so small a plant. I feed large plants 2ml/L one time then just RO water the next time so averaging 1ml/L. You're doubling that and then adding CalMag with more N so it could be a form of burning called toxic salts buildup and I highly suspect it is.

When you say you pH your water to 6.8 is that before you add the nutes to it? What type of water are you using and what's it's pH and ppm? If it's fairly hard tap water you shouldn't be using CalMag. Teh nutes have that in them and too much Ca blocks some others.

I've always only used RO or distilled water and NEVER checked the pH once AN went pH Perfect either in DWC or soilless ProMix HP. You should never adjust the pH of your nute sol'n after mixing or you screw up the pH Perfectness of it and that could be an issue as well.

You might want to switch to a 3-2-1 ratio, (GMB), in veg then back to 1-1-1 with a dash of Big Bud just a week before flipping to flower.

I'd run some extra water thru the pots to reduce nute levels a bit and skip a feeding.

Good luck!

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I use bottled water which has an EC of 0.08 and ph is at 6.7. When I add the nutes it drops down to around 5.5 so I bring it back up with ph+. 5.5 is a bit low for potting mix if im not mistaken. With 2ml/L plus calmag today the EC of the nute solution was at 1.63 and runoff came back to 1.3EC. Its an autoflower which is in preflowering at the moment. How much do you think I should be feeding it? Plant is about 15 inches tall.

I'm running some autos as well. A dozen outside in the ground and 3 small ones indoors to breed with. Spraying one with STS to force fem pollen and starting to see 'nanners emerging.

pH pens don't seem to read these nutes properly so you shouldn't be adjusting it. The pH will find it's right spot once in the pot and as they are hydro nutes pH 5.5 is what I aimed at in DWC before pH Perfect came along. Your water sounds fine so trust the technology and just mix then feed.

Autos continue to grow as they flower so at this stage they will still want ample N so I'd stick with a 1-1-1 ratio for feeding then the P and K are helping with the budding end of things. I'm still working out the best way to feed autos myself while getting heavily into more organic growing using ProMix HP as my base.

I barely use any CalMag with RO water that's about 3ppm but do add some Epsom Salts now and then. In flowering the plants like extra Mg and the S in it is the 'secret ingredient' in many bud boosters. I love Big Bud myself but only use about half they say to use. Just read a paper today that supports the idea that we use way too much P and K for optimal growth and actually reduce resin yields.

You say you use BioBiz CalMag. Do you also use their soil? As ProMix has zero nutes it has to have nutes right away but with real soil that has lots of nutes you need to feed hydro nutes at lower rates.

Like I said I'd wash a little water thru it. Maybe half the volume of the pot for runoff and skip a feed. Then do a 2ml/L of each with a tsp/4L of epsom.

How much does that water cost you? I'm paying $3.49Can for a 20L jug and we use it for drinking water as our tap water comes out of a dugout on our property and is unfit for human, or plant, consumption except outside in the garden. I bought all the stuff to build my own custom RO unit but haven't got around to installing it yet. Soon tho I hope.

Big thunderstorm tonight that broke 4 branches off my 5 outdoor auto plants. A good 3 or 4 oz of yield lost there dammit! Wife says I told you so. Should have made that windbreak. Hate when she's right. Need to set up a cover as well. Can get nasty hailstorms this time of year. Just another month to go. Same strain as last year and started at the same time and they were chopped Sept. 11. 6oz each.

I took all the fans off before taking this pic last fall. Chopped the next day. The middle one is an unrelated CBD auto.



Poor girls all beat up.





3:30 so off to bed for this old fart.

calcium deficiency

BenGman said:

calcium deficiency

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Unlikely as low Ca usually shows on newer and mid growth leaves first being it's an immobile nutrient so wouldn't be relocated from old fan leaves. Toxic salts buildup on the other hand first shows in the oldest leaves unless there is too much heat from lights on the tops then it can show there first but may just be a result of the excess heat and the plant moving a lot more nute laden water thru them causing a local buildup.

There's plenty of Ca in his nutes and he uses CalMag too so should be lots of Ca. I ran DWC with RO water for ten years before ever getting CalMag and never saw low Ca. Low Mg tho but Epsom fixed that up fine.

Pot looks a bit small you may want to think about transplanting, when you say you fed 2ml/L of AN is that 1/2 strength? it sounds like it's a bit early to be feeding 1/2 strength nutes to a plant that size

yosim said:

Pot looks a bit small you may want to think about transplanting, when you say you fed 2ml/L of AN is that 1/2 strength? it sounds like it's a bit early to be feeding 1/2 strength nutes to a plant that size

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AN feeding chart shows that you need to feed it week 1: 1ml/L, Week 2: 2ml/L, week 3: 3ml/L and week 4: 4ml/L and then charts shows to keep giving it 4ml/L till harvest. The first time I fed it was 0.5ml/L. 3-4 days later I did 1ml/L. and This week I fed it another 2 times at 2ml/L each feeding. Runoff EC reading today was 1.4 and I fed it around 1.63 like 4 hours ago. Now that I fed it, I'll keep an eye on it for the next few days and if problem persists I'll skip a feeding and give it water to wash out the salts and I'll drop my feeding to 1ml/L. I have another plant that is like 2 days younger and I'm giving it the exact same strength of nutes and it's all green. It's looks like the issue is just with this specific plant.

Overwatering

BL2001 said:

AN feeding chart shows that you need to feed it week 1: 1ml/L, Week 2: 2ml/L, week 3: 3ml/L and week 4: 4ml/L and then charts shows to keep giving it 4ml/L till harvest. The first time I fed it was 0.5ml/L. 3-4 days later I did 1ml/L. and This week I fed it another 2 times at 2ml/L each feeding. Runoff EC reading today was 1.4 and I fed it around 1.63 like 4 hours ago. Now that I fed it, I'll keep an eye on it for the next few days and if problem persists I'll skip a feeding and give it water to wash out the salts and I'll drop my feeding to 1ml/L. I have another plant that is like 2 days younger and I'm giving it the exact same strength of nutes and it's all green. It's looks like the issue is just with this specific plant.

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I've never followed those feeding charts at all, I just feed based on how the plant is looking, every plant will have different feeding requirements. I use AN Sensi Bloom, 4ml/L is full strength and I don't ever recall giving any of my plants 4ml/L

yosim said:

I've never followed those feeding charts at all, I just feed based on how the plant is looking, every plant will have different feeding requirements. I use AN Sensi Bloom, 4ml/L is full strength and I don't ever recall giving any of my plants 4ml/L

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What's the maximum dose you ever gave a plant?

Feeding charts are made to sell nutrients not to grow good plants.. Its all about $$$

BL2001 said:

What's the maximum dose you ever gave a plant?

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probably about 3/4 strength, usually don't have to exceed 1/2 strength

yosim said:

I've never followed those feeding charts at all, I just feed based on how the plant is looking, every plant will have different feeding requirements. I use AN Sensi Bloom, 4ml/L is full strength and I don't ever recall giving any of my plants 4ml/L

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yosim said:

probably about 3/4 strength, usually don't have to exceed 1/2 strength

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Same here. The most I've ever used for a single feeding is 3ml/L and then just water for the next time. My final pots hold 16L so only need watering every 3 or 4 days in flower.

I would much prefer to see a little yellowing on some older fan leaves than burned tips and margins on my leaves indicating overfeeding and nute burn. A constant low level of overfeeding leads to toxic salts buildup that starts showing about the middle of flowering with leaves burning all over, (not unlike the first pics the OP put up), that spreads across the leaves leaving them all burnt, thick and crispy. With yellowing from lack of N, Mg or normal senescence as the end nears the leaves feel thin and soft.

Those feed charts are too much with every damn maker. The only one with good advice I've seen is for the MegaCrop dry nutes. Their chart isn't bad but they even tell you that it's just a guideline and you should observe your plants and feed as they tell you. It takes some practice but you do learn to read your plants the more you observe their reactions to what you feed them or other changes you make like lighting, temp RH etc.

To the OP: What kind of light and how big is that pot.?? And what exactly is your growing medium?
Someone else mentioned transplanting but I can’t tell what it’s growing in presently.
Honestly, a pic of the entire plant could generate a lot of help for you.
You’ve said it was 15” tall….I’ve seen 15” plants that were total bushes and yielding 3-4 oz. But, I’ve also seen plants the same height with 23 total leaves and wouldn’t produce enough to give a schoolboy a good rush.
You seem like you’re taking things seriously and really want to do things right. You likely have the “sticktuitiveness” to learn from your first few grows and become a seasoned grower.
Knowing the details I mentioned can allow the many “Green Thumbs” on this site to better assist and save you a lot of time and frustration.
For example, You could do everything perfect w/ nutrition and growing medium but if you’re growing under a 25W shop light, you’re never gonna get the results you want….catch my drift.

Bullmark said:

To the OP: What kind of light and how big is that pot.?? And what exactly is your growing medium?
Someone else mentioned transplanting but I can’t tell what it’s growing in presently.
Honestly, a pic of the entire plant could generate a lot of help for you.
You’ve said it was 15” tall….I’ve seen 15” plants that were total bushes and yielding 3-4 oz. But, I’ve also seen plants the same height with 23 total leaves and wouldn’t produce enough to give a schoolboy a good rush.
You seem like you’re taking things seriously and really want to do things right. You likely have the “sticktuitiveness” to learn from your first few grows and become a seasoned grower.
Knowing the details I mentioned can allow the many “Green Thumbs” on this site to better assist and save you a lot of time and frustration.
For example, You could do everything perfect w/ nutrition and growing medium but if you’re growing under a 25W shop light, you’re never gonna get the results you want….catch my drift.

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Hi. Thanks for your reply. Its an autoflower growing outdoors with about 6hrs of direct sunlight a day. average RH is about 50% but sometimes it goes up to 60%. Temperature ranges from about 30-34 degrees celsius during the day and 25-28 during night time. Pot size is 2.8litres. I attached a photo of the potting mix I use and also a couple of pictures of the full plant. If you need anymore information LMK. Thanks again