Boron

Beet & brassicae - heart rot

Calcium

Distortion in growing points, Internal Rust Spot in potatoes

Copper

Barley - bleached, twisted awns, spiraling leaves

Wheat - blind and blackened ears, ‘wither tip’

Iron

Brittle looking, yellowing

Magnesium

Interveinal yellowing in older leaves, beaded necrosis

Manganese

Pale yellow mottling, floppy leaves, often in patches

Wheat, oats - grey spot

Barley - brown spot

Sugar Beet - speckled yellows

Peas - marsh spot

Potatoes - brown/black spot, interveinal chlorosis

Nitrogen

Small, yellow-green leaves, stunted plants

Phosphorous

Thin bluish leaves, poor growth

Potassium

White or pale brown leaf tips and margins

Sulphur

Yellowing of younger leaves