Nutrients

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

YaraVita® BORTRAC™

Soybean: 1- 2 l/ha when the crop is 5 to 15 cm tall. For moderate to severe deficiency, repeat once or twice at 10 to 14 day intervals up to the start of flowering. Water rate: 50 to 200 l/ha. Fève de soja : Application de 1- 2 l/ha lorsque la culture mesure de 5 à 15 cm. Répéter une ou deux fois en cas de déficience modérée à sévère à intervalles de 10 à 14 jours plus tard au stade début floraison. Volume d'eau: 50 à 200 l/ha.

Read more about YaraVita® BORTRAC™