Nutrients

N Nitrogen
P Phosphorus
K Potassium
Mg Magnesium
Ca Calcium
S Sulfur
B Boron
Fe Iron
Mn Manganese
Zn Zinc

Banana - Deformation

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. The leaves become chlorotic from their margins and are curled inwards. Later, the chlorotic zones become necrotic dark brown.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the color of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves not from the leaf margin.

Banana - Chlorosis

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. Proceeding from their margins, the leaves become chlorotic and curled inwards. Later, the chlorotic zones turn necrotic dark brown.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the colour of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves, not from the leaf margin.

Banana - Deformation

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. Proceeding from their margins, the leaves become chlorotic and curled inwards. Later, the chlorotic zones turn necrotic dark brown. White strips perpendicular to the veins may be seen on the underside of the lamina.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the colour of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves, not from the leaf margin.

Banana - Deformation

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. Proceeding from their margins, the leaves become chlorotic and curled inwards. Later, the chlorotic zones turn necrotic dark brown. White strips perpendicular to the veins may be seen on the underside of the lamina.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the colour of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves, not from the leaf margin.

Banana - White

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. Proceeding from their margins, the leaves become chlorotic and curled inwards. Later, the chlorotic zones turn necrotic dark brown. White strips perpendicular to the veins may be seen on the underside of the lamina.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the colour of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves, not from the leaf margin.

Banana - Deformation

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. Proceeding from their margins, the leaves become chlorotic and curled inwards. Later, the chlorotic zones turn necrotic dark brown. White strips perpendicular to the veins may be seen on the underside of the lamina.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the colour of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves, not from the leaf margin.

Banana - Deformation

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. Proceeding from their margins, the leaves become chlorotic and curled inwards. Later, the chlorotic zones turn necrotic dark brown. White strips perpendicular to the veins may be seen on the underside of the lamina.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the colour of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves, not from the leaf margin.

Banana - Deformation

Symptoms
Boron deficiency symptoms start on the youngest leaves of the plant. Proceeding from their margins, the leaves become chlorotic and curled inwards. Later, the chlorotic zones turn necrotic dark brown. White strips perpendicular to the veins may be seen on the underside of the lamina.

Reasons
Boron deficiency Calcium deficiency also leads to necrosis on the upper leaves, but the colour of the necrosis is a lighter brown, and the necrosis starts from the top of the leaves, not from the leaf margin.

Boron deficiency made worse by

  • Sandy soils
  • Alkaline soils
  • Soils low in organic matter
  • High levels of nitrogen
  • High levels of calcium
  • Cold wet weather
  • Periods of drought

Boron is important for

  • Increased fruit number, weight and yield
  • Boron can activate uptake of other nutrients
  • Increases TSS content of fruit

Yara recommended fertilizers for Boron

YaraVita BORTRAC

YaraVita BORTRAC

Banana: Regular applications may be necessary where low or marginal levels of boron exist. Spray at 300 ml-1 l/ha per application. Water rate: 30-500 l/ha.

Read more about YaraVita BORTRAC