Živiny

N Dusík
P Fosfor
K Draslík
Mg Hořčík
Ca Vápník
S Síra
B Bór
Fe Železo
Mn Mangan
Zn Zinek

Banány - Chlorosis

Projevy
Slow, stunted growth with 'rosetting' appearance. Thin and woody stems; petioles break easily. Broad longitudinal chlorotic bands with necrotic spots may occur on both sides of the midrib or along the leaf edge. Marginal necroses on oldest leaves coalesce, resulting in premature senescence. Younger leaves may show bluish to purple tint, especially on backside.

Příčiny
Phosphorus deficiency. Excess nitrogen fertilization also leads to a blue-green color of the leaves. Manganese deficiency also causes marginal necrosis, but these have a darker color.

Banány - Growth retardation

Projevy
Slow, stunted growth with 'rosetting' appearance. Thin and woody stems; petioles break easily. Broad longitudinal chlorotic bands with necrotic spots may occur on both sides of the midrib. Marginal necroses on oldest leaves coalesce, resulting in premature senescence. Younger leaves may show bluish to purple tint, especially on backside.

Příčiny
Phosphorus deficiency

Banány - Chlorosis

Projevy
Slow, stunted growth with 'rosetting' appearance. Thin and woody stems; petioles break easily. Broad longitudinal chlorotic bands with necrotic spots may occur on both sides of the midrib. Marginal necroses on oldest leaves coalesce, resulting in premature senescence. Younger leaves may show bluish to purple tint, especially on backside.

Příčiny
Phosphorus deficiency

Banány - Discolouration

Projevy
Slow, stunted growth with 'rosetting' appearance. Thin and woody stems; petioles break easily. Broad longitudinal chlorotic bands with necrotic spots may occur on both sides of the midrib. Marginal necroses on oldest leaves coalesce, resulting in premature senescence. Younger leaves may show bluish to purple tint, especially on backside.

Příčiny
Phosphorus deficiency

Phosphorus deficiency zhoršuje

  • Acidic or very alkaline (calcareaus) soils
  • Low organic matter
  • Cold or wet conditions
  • Crops with a poorly developed root system
  • Soils with low P reserves
  • Soils with a high phosphate capacity
  • Iron rich soils

Fosfor je důležitý pro

  • Part of nucleic acids, phospholipids and energy storing and transferring systems in plants
  • Important for root growth, flower development and fruit set