NUTRIENT DEFICIENCY SYMPTOMS IN SOYBEANS

- pale green or yellowed leaves (fairly uniform discoloration)
- look for poor nodulation on roots

- growth stunted, leaf cupping and some discoloration possible
- deficiencies are rare in Ohio

- chlorotic areas around leaf margins
- shows up on lower (older) leaves first

- leaf tips pinched, leaf bronzing, early leaf drop, growing point goes necrotic
- deficiencies are rare in Ohio

- pale green lower leaves w/yellow mottled interveinal tissue, later looks speckled bronze
- deficiencies are rare in Ohio (causes: sandy soils, low pH, high K)

- stunted plants, pale green color, similar to nitrogen deficiency except chlorosis may be more apparent on upper leaves
- most likely during cool wet conditions or on sandy soils

- stunted plants with interveinal chlorosis
- problem in high pH soils (>7)

- same symptoms as manganese (also a problem in high pH and/or dry soils)
- deficiencies are rare in Ohio

- small seed, poor quality
- no deficiencies have been documented in Ohio
- toxicity can occur at low pH's, symptoms include yellowing to browning of leaf margins, crinkled leaves and leaf edges that cup up or down (can stunt plant)

- no deficiency symptoms are visible
- deficiencies are rare in Ohio

- stunted plants with light green to yellow leaves (interveinal chlorosis). Lower leaves may turn bronzed and drop.
- scarce flowers, malformed pods, slow maturation

- molybdenum is necessary for nitrogen fixation, symptoms are the same as nitrogen deficiency.

- toxicity: necrosis along the leaf margin, leaves shed prematurely, occurs most frequently during reproductive stages.