Range of Sufficient K Concentrations in Upper Plant Parts

Plant Species

Cereals, young shoots 5-8 cm above soil surface

Wheat (Triticum aestivum) Barley (Hordeum vulgare) Rye (Secale cereale) Oats (Avena sativa)

Maize (Zea mays)" at anthesis near cob position Rice (Oryza sativa)a before anthesis Dicotyledonous field crops

Forage and sugar beets (Beta vulgaris)a

Potatoes (Solanum tuberosum)a at flowering

Cotton (Gossypium), anthesis to fruit setting

Flax (Linum usitatissimum), 1/3 of upper shoot at anthesis

Rape (Brassica napus)a

Sunflower (Helianthus annuus)a at anthesis

Faba beans (Vicia faba)a at anthesis

Phaseolus beans (Phaseolus vulgaris)

Peas (Pisum sativum)a at anthesis

Soya bean (Glycine max)

Red clover (Trifolium pratense)a at anthesis

White clover (Trifolium repens) total upper plant part at anthesis

Alfalfa (Medicago sativa) shoot at 15 cm

Forage grasses

Total shoot at flowering 5 cm above soil surface, Dactylis glomerata, Poa pratensis, Phleum pratense, Lolium perenne, Festuca pratensis

Concentration Range (mg K/g DM)

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