All times are UTC + 8 hours




Post new topic Reply to topic  [ 6 posts ] 
Author Message
PostPosted: Aug 18th, '16, 04:34 
Offline
Valued Contributor
Valued Contributor
User avatar

Joined: Feb 19th, '14, 04:54
Posts: 65
Gender: Female
Are you human?: YES
Location: PA, US
Unsure if this is a calcium deficiency or something else?
Image
I have it indoors and under a light, did not start getting these spots until plants had grown for 3 months.

_________________
With a background in planted aquariums I've set up a few aquaponic systems-constant flood grow beds.
I make typos often, sorry in advance!


Top
 Profile  
Reply with quote  
    Advertisement
 
PostPosted: Aug 18th, '16, 04:57 
Offline
Legend Member
Legend Member

Joined: Jan 13th, '14, 01:53
Posts: 726
Gender: Male
Are you human?: Yes
Location: Treasure Coast Florida
I'm going to say its probably Magnesium or Potassium deficiency and not calcium. I'm assuming this is on older leaves since you said its been growing for 3 months. If in fact its on older leaves your noticing these spots, its because the newer leaves need the deficient element so it pulls it from the older leaves. Calcium is not mobile. Magnesium, potassium, nitrogen, phos, and others are mobile. How are your nitrate levels? What is your pH? Any other plants in the system with signs of dificiencies?


I'm still learning this stuff so I may be way off... :D

_________________
My AP YouTube Channel

System Thread


Top
 Profile  
Reply with quote  
PostPosted: Aug 18th, '16, 08:36 
Offline
Site Admin
Site Admin
User avatar

Joined: Mar 12th, '06, 07:56
Posts: 17763
Images: 4
Location: Perth
Gender: Male
Blog: View Blog (1)
My guess would be anthracnose... See pdf here http://ausvegvic.com.au/pdf/VG10123_Let ... -Guide.pdf

_________________
www.havehomewilltravel.com
Life on the road


Top
 Profile Personal album  
Reply with quote  
PostPosted: Sep 7th, '16, 21:20 
Offline
A posting God
A posting God
User avatar

Joined: Feb 7th, '11, 18:32
Posts: 3178
Gender: Male
Are you human?: Most of me
Location: Thailand, Chaing Rai
You have signs of tip burn in your pics,so I will go with Calcium,I get this exactly the same look at times of high humidity,transpiration is low or nil resulting in low Calcium uptake,another sign for me is stubby roots,instead of the log white root system I normally see the roots are stunted and,well just don't look right.

_________________
dasboot's system
Andreas Garden.
https://www.facebook.com/Andreas-Garden ... 681644511/


Top
 Profile  
Reply with quote  
PostPosted: Oct 14th, '16, 13:35 
Offline

Joined: Oct 12th, '16, 17:24
Posts: 8
Gender: Male
Are you human?: YES
Location: Toronto
It may be caused due to fungus. I've heard that lettuce should be grown with good air circulation and in case of appearance of spots it's better to rotate the crops. Will you be able to grow it outside??


Top
 Profile  
Reply with quote  
PostPosted: Oct 14th, '16, 15:32 
Offline
Moderator
Moderator
User avatar

Joined: Aug 26th, '10, 07:17
Posts: 8819
Gender: Male
Are you human?: YES
Location: Oregon, USA
I realize this is an old thread but I think it's probably either caused by calcium or guttation. Both of these look related because the water pressure within the leaf is involved. If too much water pressure exists you get guttation and water droplets along the leaf edge. When the water evaporates the salts left behind can cause tip burn. If too little water pressure exists then calcium doesn't get transported to the leaf tip causing tip burn. You might notice the guttation during the night or early morning.

Here's a good picture of guttation on a strawberry leaf - https://commons.wikimedia.org/wiki/File:Guttation_on_a_strawberry_leaf.jpg

Some miscelaneous related info -
http://purehydroponics.com/wp-content/uploads/2012/07/Avoiding-Tip-Burn-on-Hydroponic-Crops.pdf


Top
 Profile  
Reply with quote  
Display posts from previous:  Sort by  
Post new topic Reply to topic  [ 6 posts ] 

All times are UTC + 8 hours


Who is online

Users browsing this forum: No registered users and 4 guests


You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot post attachments in this forum

Search for:
Jump to:  

Powered by phpBB® Forum Software © phpBB Group
Portal by phpBB3 Portal © phpBB Türkiye
[ Time : 0.163s | 16 Queries | GZIP : Off ]