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

Soybean - Growth retardation

Symptoms
Leaves usually show a dark green to bluish tint. The displayed photo shows yellow chlorosis. Because of the effect that P deficiency has on retarding overall growth, striking foliar symptoms that are evidence of deficiency in certain other nutrients, for example N and K, are sometimes observed.

Reasons
Phosphorus deficiency. The uptake of P is inhibited in acidic as well as in cool, wet soils.

Soybean - Chlorosis

Symptoms
Plants suffering from P deficiency usually show a dark green to bluish tint on their foliage. In the displayed picture, leaves show an even chlorosis and a dark, brownish tint on the interveinal fields.

Reasons
Phosphorus deficiency. Soybeans require relatively large amounts of P, especially at pod set. The uptake of P is inhibited in acidic as well as in cool, wet soils.

Soybean - Chlorosis

Symptoms
Plants suffering from P deficiency usually show a dark green to bluish tint on their foliage. In the displayed picture, leaves show an even yellow chlorosis and a beginning light brown necrosis on the marginal area of the leaf base.

Reasons
Phosphorus deficiency. Soybeans require relatively large amounts of P, especially at pod set. The uptake of P is inhibited in acidic as well as in cool, wet soils.

Soybean - Chlorosis

Symptoms
P deficient plants suffer from growth retardation and sparse foliage. Leaves usually show a dark green to bluish tint. In the displayed case, older leaflets show interveinal chlorosis and necrosis. Light brown necrotic blotches coalesce along the leaf margin.

Reasons
Phosphorus deficiency. Soybeans require relatively large amounts of P, especially at pod set. The uptake of P is inhibited in acidic as well as in cool, wet soils.

Soybean - Chlorosis

Symptoms
Leaves usually show a dark green to bluish tint. In the displayed case, older leaflets show interveinal chlorosis and necrosis. Light brown necrotic blotches coalesce towards the leaf margin.

Reasons
Phosphorus deficiency. Soybeans require relatively large amounts of P, especially at pod set. The uptake of P is inhibited in acidic as well as in cool, wet soils.

Phosphorus deficiency made worse by

  • Acidic or very alkaline (calcareaus) soils
  • Low organic matter
  • Cold or wet conditions
  • Crops with a poorly developed root system
  • Soils with low P reserves
  • Soils with a high phosphate capacity
  • Iron rich soils

Phosphorus is important for

  • Increased energy transfer
  • Improved synthesis of proteins
  • Greater formation of nucleic acids
  • Stronger cell membranes due to increase in phospholipids

Yara recommended fertilizers for Phosphorus

YaraVita® HYDROPHOS™

YaraVita® HYDROPHOS™

Soybean: 3 - 5 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 3 - 5 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® HYDROPHOS™

Other recommended products

YaraVita® GLYTREL™MnP
Soybean: 1 to 2 l/ha as early in the growing season as possible, provided there is adequate leaf cover to intercept the spray. Repeat as necessary at 10 to 14 day intervals. Water rate: 30 to 200 l/ha. Soja: 1-2 l/ha appliquer dès que la surface foliaire est suffisamment développée. Répéter à 10 à 14 jours d'intervalle si nécessaire. Volume d'eau: 30 à 200 l/ha.