Salat - Necrosis
Symptomer
Symptoms of zinc deficiency on lettuce start on older or medium leaves. They develop papery, grey-green necrosic spots with brown borders on leaf margins. Necrotic areas increase quickly and flow together.
Leaf parts which are not subjected to light remain green.
Growth is restricted.
Zinc deficiency in an early stage of development causes rosetting, no heads are formed.
Årsak
Zinc deficiency on leaves compared to optimum supply
Salat - Growth retardation
Symptomer
Symptoms of zinc deficiency on lettuce start on leaf margins of older or medium leaves. They develop papery, grey-green necrotic spots with brown borders, mostly without preceding chlorosis. Necrotic areas increase quickly and flow together.
Leaf parts which are not subjected to light, remain green.
Growth is restricted.
Zinc deficiency in an early stage of development causes rosetting, no heads are formed.
Årsak
Zinc deficiency
Salat - Growth retardation
Symptomer
Symptoms of zinc deficiency on lettuce start on leaf margins of older or medium leaves. They develop papery, grey-green necrotic spots with brown borders, mostly without preceding chlorosis. Necrotic areas increase quickly and flow together.
Leaf parts which are not subjected to light, remain green.
Growth is restricted.
Zinc deficiency in an early stage of development causes rosetting, no heads are formed.
Årsak
Zinc deficiency
Salat - Growth retardation
Symptomer
Symptoms of zinc deficiency on lettuce start on leaf margins of older or medium leaves. They develop papery, grey-green necrotic spots with brown borders, mostly without preceding chlorosis. Necrotic areas increase quickly and flow together.
Leaf parts which are not subjected to light, remain green.
Growth is restricted. Zinc deficiency in an early stage of development causes rosetting, no heads are formed.
Growth of roots is slightly restricted.
Årsak
Zinc deficiency on leaves and roots
Salat - Chlorosis
Symptomer
Symptoms of zinc deficiency on lettuce start near leaf margins of older or medium leaves. They develop papery, grey-green necrotic spots with brown borders, mostly without preceding chlorosis. Necrotic areas increase quickly and flow together.
Leaf parts which are not subjected to light, remain green.
Årsak
Commencing zinc deficiency on leaves
Zinc deficiency vs. optimum forverret av
- Organic soils
- High pH soils
- Soils rich in phosphorus
- Soils receiving high phosphorus application
- Cold wet conditions
Sink er viktig for
- Enzyme activation, but also for synthesis of growth regulators
