Nutrients

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

Citrus - Deformation

Symptoms
Boron deficiency causes the death of the terminal growing point. The tree loses its apical dominance and sends out multiple shoots.

Reasons
Boron deficiency on shoots

Citrus - Deformation

Symptoms
Early breakdown of albedo, caused by poor boron supply. Gum spots in the albedo of the fruit and flesh near the rind may occur and result in fruit creasing (shrivelled surface makes processing more difficult).

Reasons
Boron deficiency. Poor boron supply reduces calcium uptake and therefore can induce a breakdown of the albedo and promote post-harvest rot.

Citrus - Deformation

Symptoms
Boron deficiency causes the death of the terminal growing point. The tree loses its apical dominance and sends out multiple shoots.

Reasons
Boron deficiency on shoots

Citrus - Spots

Symptoms
A lack of boron results in gum pockets forming in the fruit albedo and flesh, near the rind. Fruit is small and hard with gum like spots appering on the skin.

Reasons
Boron deficiency. Citrus is sensitive to boron. Poor boron supply reduces calcium uptake and therefore can induce a breakdown of the albedo and promote post-harvest rot.

Boron deficiency on citrus 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

  • More uniform and vigorous vegetative growth
  • Leaves are properly formed and premature drop is avoided
  • Fruit set and development is improved
  • Fruit quality (juice/sugar levels) enhanced
  • Fruit/rind ratio improved
  • Yield increased

Yara recommended fertilizers for Boron

YaraVita® POWERBOR™ Ca

YaraVita® POWERBOR™ Ca

Citrus: 1 to 2 quarts/acre applied before flowering and after petal fall during fruit sizing. Water rate: minimum 40 gallons per acre.

Read more about YaraVita® POWERBOR™ Ca