Nutrients

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

Tobacco - Growth retardation

Symptoms
Growth retardation due to shortening of internodes. Shoot tips die off

Reasons
Boron deficiency. Boron uptake may be delayed by cool temperatures. Boron deficiency symptoms at young seedlings are similar to those of cold injury.

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

  • Stabilization of plant tissues and improved plant and crop strength, working together with Ca
  • Increased crop quality and yield