Final diagnosis


Ammonia toxicity (Large non-parasitic pivot)

Ammoniacal Phytotoxicity
The cortex of some roots shows a reddish brown coloration. Many rootlets are also affected. <b> Ammonia toxicity </b>
Toxicite_ammoniacale4
Root burns are the cause of the reduced growth of this lettuce. The blades of several leaves gradually turn yellow at the periphery and eventually turn brown and necrose. <b> Ammonia toxicity </b>
Toxicite_ammoniacale1
Toxicite_ammoniacale3