Boron deficiency-Soybean

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Nutrients

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™

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.