Why is my bibb lettuce getting these brown tips on the inner leaves? This is growing in an NFT system.
Water temps – 68.9 F
Nutrients – General Hydro MaxiGro
pH – 6.05
PPM – 1100
Just changed res two days ago, so it's fresh. Is this a result of too much nutrient?
by SnowBeeJay
3 Comments
https://www.e-gro.org/pdf/2015_431.pdf
Lettuce tip burn. TLDR increase air flow decrease humidity
I don’t know, but my Bibb lettuce just did the EXACT same thing in my NFT greenhouse a week ago. Burnt tips, and lizard skin on some of the leaves. Other types (Ruby Red, Boston) are still great. I’m in Boise, ID.
Low air flow causes reduced transpiration, especially in the middle of the crown where the leaves form. This leads to calcium deficiency symptoms and tip burn. Put a fan on it.