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

Soybean - Deformation

Symptoms
Upper leaves turn yellow and become mottled with small, brown necrotic spots. Leaf margins are bent down and internodes are shortened.

Reasons
Boron deficiency. Soybeans are quite tolerant to B deficiency. Symptoms are similar to K or Ca deficiency and to leafhopper injury.

Soybean - Deformation

Symptoms
Upper leaves turn yellow and become mottled with small, brown necrotic spots. Leaf margins are bent down and internodes are shortened.

Reasons
Boron deficiency. Soybeans are quite tolerant to B deficiency. Symptoms are similar to K or Ca deficiency and to leafhopper injury.

Soybean - Deformation

Symptoms
Upper leaves turn yellow and become mottled later small, brown necrotic spots appear. Leaf margins are bent down and internodes are shortened.

Reasons
Boron deficiency. Soybeans are quite tolerant to B deficiency. Symptoms are similar to K or Ca deficiency and to leafhopper 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

  • More efficient carbohydrate metabolism and protein synthesis
  • Improved pollen germination

Yara recommended fertilizers for Boron

YaraVita® POWERBOR™ Ca

YaraVita® POWERBOR™ Ca

Soya Bean: 1 to 2 quarts/acre when crop is 4 to 6" tall. For moderate to severe deficiency, a repeat application may be necessary 10 to 14 days later. Water rate: 3 to 20 gallons per acre.

Read more about YaraVita® POWERBOR™ Ca