new growth is turning yellow

[omera1]

Hello,
got an autoflower in 11l coco, handwatering. since a week the new growth, or new upper leaves are turning yellow. i saw a bit of mg deficiency, and added some epsom to my feeding.
my feeding in numbers:
5,8 pH
1,5 EC
15 ppm NH4+
28 ppm NO3-
110 ppm K
55 ppm P
40ppm Mg

Ca every week @ 1g/l CaCl2 foliar.

what is my problem? maybe iron? iron/mg/ca at the same time ?

 

[al70]

Hello,
got an autoflower in 11l coco, handwatering. since a week the new growth, or new upper leaves are turning yellow. i saw a bit of mg deficiency, and added some epsom to my feeding.
my feeding in numbers:
5,8 pH
1,5 EC
15 ppm NH4+
28 ppm NO3-
110 ppm K
55 ppm P
40ppm Mg

Ca every week @ 1g/l CaCl2 foliar.

what is my problem? maybe iron? iron/mg/ca at the same time ?

View Image
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Boron Deficiency

Problem: Cannabis leaves and roots show abnormal and slowed growth when showing a boron defiency. The first signs of a cannabis boron deficiency is abnormal or thick growth tips. New leaves may display chlorosis (yellowing of leaves). Stems may become rough or hollow. The plant may look like it has a calcium deficiency because boron is needed for the plant to properly use calcium. New growth is affected the most, and may look like it's been burnt or scorched, hope this is some help, i'm not 100% sure, goodluck

 

[omera1]

thanks!
ok, but how to fix that problem? i have some Hesi Root Complex, should i foliar feed it or what can i do?

edit: ive read that sea kelp contains high amounts of boron. i have some Ascophyllum Nodosum extract here, so foliar feed?

 

[Coba]

looks like it needs some Sulfur to me. Gypsum or Epsom salts will clear that up.

 

[omera1]

oh sorry i just forgot i feed sulfur @ ~50ppm

 

[al70]

sulphur def usually starts with older leaves, try waiting a few hours for some more answers omera, sorry couldn't help any more, i'm gonna have a look around for some more answers for you, goodluck. don't foliar feed anything yet

 

[al70]

sulphur def usually starts with older leaves, try waiting a few hours for some more answers omera, sorry couldn't help any more, i'm gonna have a look around for some more answers for you, goodluck. don't foliar feed anything yet

Boron is not absorbed will without enough potassium and nitrogen, or if there isn't enough moisture. You plant may also exhibit signs of a boron deficiency if the pH is too high or low. Flush your system with clean, pH'd water that contains about half the nutrients needed for the plant and watch to make sure that the problem clears up for new growth.
Picture:

 

[al70]

Heat and Light Stress

Problem: Your cannabis plant can only withstand a certain amount of heat and light. After a certain point, your cannabis will start exhibiting signs of stress on the leaves near the sources of light and/or heat. Your leaves will get yellow or brown brown spotting and may appear generally burnt in places when there's too much light.
If you directly touch a plant's leaves with the lights, you will also leave "burns" if the bulbs were hot when they touched the leaves.
When the heat gets too high, the edges of the serrated leaves will begin to curl up even if there are no burns or other signs of light stress.
Light Burn

Heat Stress

Solution: Find a way to lower the temperature and/or increase the circulation in the grow room or grow area if heat is the problem. Having a small fan blowing over the tops of your plants will help prevent hot spots from forming directly under your grow lights.
If your marijuana plants are just getting too much light, try removing some of the lights or moving your lights further away from the tops of the plants.
When learning how to weed, it's best to try to keep things at a comfortable room temperature at all times for optimal growth. If it's too hot for you, it's probably too hot for your plants.

 

[al70]

Manganese Deficiency

Problem: Leaves may become yellow in between the veins, with mottled brown spots on the affected leaves. These brown dead patches may spread and eventually kill the leaf. Leaves may also shred and fall apart.
Overall growth of the marijuana plant may be stunted.

Solution: Manganese deficiencies are often caused by a pH that is too high, or if the plant is getting too much iron.
If you have a manganese deficiency in soil, try to correct pH to 6.0 - 6.5l. In hydro, correct pH to 5.5 - 6.0. You are looking to avoid higher pH ranges, as this is where manganese deficiencies are most likely to occur.
Flush your system with clean, pH'd water that contains about half the correct amount of nutrients needed by the plant. Watch to make sure that the problem starts to clear up within a couple of days.
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this is all I can find, hope you get it sorted

 

[omera1]

so much input al70, thanks a lot!
mhh i thought of too much light too, i am running a 250w hps with a cooltube. distance from cooltube glass is just 1-2 inch max. little fan is running, but maybe thats not enough... and the light is too near. i will check circulation and correct distance to about 3-4 inch. and i think some foliar seaweed isnt wrong.
From the information here i think its boron or the light.
lets see what the next 2 days bring..

 

[al70]

so much input al70, thanks a lot!
mhh i thought of too much light too, i am running a 250w hps with a cooltube. distance from cooltube glass is just 1-2 inch max. little fan is running, but maybe thats not enough... and the light is too near. i will check circulation and correct distance to about 3-4 inch. and i think some foliar seaweed isnt wrong.
From the information here i think its boron or the light.
lets see what the next 2 days bring..

don't panic, it'll work out, be lucky.

 

[Coba]

if not Sulfur then Iron. Iron will have more of a bleached look though, I still believe you are experiencing a Sulfur def.

"sulphur def usually starts with older leaves,"

^ this statement is absolutely incorrect.

First signs of a Sulfur deficiency are pale young leaves.

young leaves = New Growth

https://www.icmag.com/ic/showpost.php?p=163837&postcount=3

 

[omera1]

Ok, but do you think my S ppm are to low? Im now @ 2grams epsom to 5 Liters (1/4 more than a gallon) , ppms above.

 

[al70]

if not Sulfur then Iron. Iron will have more of a bleached look though, I still believe you are experiencing a Sulfur def.

"sulphur def usually starts with older leaves,"

^ this statement is absolutely incorrect.



young leaves = New Growth

https://www.icmag.com/ic/showpost.php?p=163837&postcount=3

Sulfur Deficiency


Problem: A sulfur deficiency will manifest itself as all-over chlorosis (yellowing of leaves) starting with the oldest leaves and may look like a nitrogen deficiency at first. The parts that are underneath the leaves may take on a distinctive pinkish red or orange color. The buds on a flowering plant may start dying off. Unlike other deficiencies that cause chlorosis, a sulfur deficiency will start at the back of the leaf and move it's way forward as opposed to started at the tips. Leaves become stiff and brittle and will eventually fall off.

Solution: Check and correct your pH to make sure that your sulfur isn't being locked out. Sulfur moves slowly through the plant so it may take a few days after you fix the problem before you start noticing an improvement in your plant.
Picture:

 

[al70]

Sulfur Deficiency


Problem: A sulfur deficiency will manifest itself as all-over chlorosis (yellowing of leaves) starting with the oldest leaves and may look like a nitrogen deficiency at first. The parts that are underneath the leaves may take on a distinctive pinkish red or orange color. The buds on a flowering plant may start dying off. Unlike other deficiencies that cause chlorosis, a sulfur deficiency will start at the back of the leaf and move it's way forward as opposed to started at the tips. Leaves become stiff and brittle and will eventually fall off.
[URL="http://growweedeasy.com/sites/growweedeasy.com/files/medium_sulfur-deficiency-cannabis.jpeg"]View Image[/URL][URL="http://growweedeasy.com/sites/growweedeasy.com/files/medium_sulphur-deficiency.jpg"]View Image[/URL][URL="http://growweedeasy.com/sites/growweedeasy.com/files/medium_sulphur-deficiency2.jpg"]View Image[/URL][URL="http://growweedeasy.com/sites/growweedeasy.com/files/medium_sulphur-info-marijuana.jpg"]View Image[/URL]
Solution: Check and correct your pH to make sure that your sulfur isn't being locked out. Sulfur moves slowly through the plant so it may take a few days after you fix the problem before you start noticing an improvement in your plant.
Picture:
View Image

i'm just trying to help this guy, neither of us is definetly right

 

[omera1]

i'm just trying to help this guy, neither of us is definetly right

thanks to both of you.
i think what i do is this:
add bloombastic @ 1ml/5l (that will raise my Fe ppm to 2.5)
and lower my base nute a bit...
2.5g espom insted of 2g per 5l
kelp extract @ 5ml/5l
Root complex @ 15ml/5l
cooltube glass is now 4 inch away and i installed an additional fan.

when its not getting better within 2-3 days i will buy some boron...

hope all this helps

 

[Coba]

from my own experience friend...

can you see the sulfur def.?

I fixed it with Gypsum... it turned into this...

the difference between mobile and immobile elements is...

the plant itself can move mobile elements ... which it does if need be, from old growth to new growth... it cannot move immobile elements, which is why immobile elements deficiencies show in the new growth.

 

[Coba]

OFC all of these issues would go away if you grew Organic

Recycled Organic Living Soil (ROLS) and No-Till thread for Beginners

 

[omera1]

sorry cant see pictures

 

[omera1]

news, i think its not getting better
today i hope to get some boron. (hard to get here)



has someone an idea?