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 - 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® MAGPHOS™

YaraVita® MAGPHOS™

Soybeans: 1 to 2 quarts/acre when crop is 6 inches tall. Repeat if necessary at 10 to 14 day intervals. Water rate: 3 to 20 gallons/acre.

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YaraVita® SENIPHOS™

YaraVita® SENIPHOS™

Soybeans: 2 quarts/acre before flowering. Water rate: 3 to 20 gallons/acre.

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NUTRA-PHOS CALZINC

NUTRA-PHOS CALZINC

Soya Bean: 2 to 10 lb. per acre per application. First application at bud to early-bloom stage, repeat in 2 to 3 weeks. Apply aerial applications in at least 5 gallons/acre and ground applications in at least 10 gallons/acre; however, when total application gallonage is 25 gallons per acre or less, DO NOT mix more than 1 lb. of this product per gallon of water.

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NUTRA-PHOS Zn-K PLUS

NUTRA-PHOS Zn-K PLUS

Soya Bean: 2 to 10 lb. per acre per application. First application at bud to early-bloom stage, repeat in 2 to 3 weeks. Apply aerial applications in at least 5 gallons/acre and ground applications in at least 10 gallons/acre; however, when total application gallonage is 25 gallons per acre or less, DO NOT mix more than 1 lb. of this product per gallon of water.

Read more about NUTRA-PHOS Zn-K PLUS