FIG. 22. Relation between soil temperature, potassium excess (in relation
to the equivalent total of calcium and magnesium) and incidence of grass
tetany
N.B. Cf. Table 21 concerning the influence of the
ratio on the
incidence of grass tetany.
2. Cf. Figs. 20 and 21 for the influence of temperature on
the incidence of tetany.
From KEMP