Magnesium deficiency - Tomato

Symptoms
Symptoms of magnesium deficiency start on older leaves. They show interveinal chlorosis on the leaf margins and some whitish to light brown necrotic dots. If deficiency is severe, interveinal chlorosis progresses from the margins to the middle of the leaflets. The small veins also become chlorotic, but the bigger veins remain dark green first. Subsequently the whole leaves are yellowing and finally the older leaves die. In this case growth is severely impaired and fruit yield is reduced.

Reasons
Magnesium deficiency Magnesium uptake can be depressed by an excess of other cations (potassium, ammonim, calcium). Symptom can be confused with nitrogen and iron deficiency. But in the case of nitrogen deficiency the whole leaf turns uniformly yellow and the veins do not remain green. Iron deficient plants also show intercostal chlorosis, but in contrast to Mg it starts on the young leaves.

Symptoms
Symptoms of magnesium deficiency start on older leaves. They show interveinal chlorosis on the leaf margins, covered with some whitish to light brown necrotic dots. If deficiency is severe, interveinal chlorosis progresses from the margins to the middle of the leaflets. The small veins also become chlorotic, but the bigger veins remain dark green first. The necroses become larger. Subsequently the whole leaves are yellowing and finally the older leaves die. In this case growth is severely impaired and fruit yield is reduced.

Reasons
Magnesium deficiency Magnesium uptake can be depressed by an excess of other cations (potassium, ammonim, calcium). Symptom can be confused with nitrogen and iron deficiency. But in the case of nitrogen deficiency the whole leaf turns uniformly yellow and the veins do not remain green. Iron deficient plants also show intercostal chlorosis, but in contrast to Mg it starts on the young leaves.