Wheat [Triticum vulgare]

The first signs of magnesium deficiency on wheat is the appearance of bead-like spot lacking chlorophyll between the leaf veins and necrotic spots at the leaf tips. Later the leaves turn yellow and appear stunted. Magnesium Deficiency in Wheat

Maize [Zea mais]

Magnesium deficiency is shown by typical yellowish-white stripes between the veins. The necrotic leaf edges are drawn together giving a ridged appearance. Finally, the whole leaf turns yellow and dies. The symptoms are first seen in older leaves.

Sugar Beet [Beta vulgaris]

Magnesium deficiency first appears on older leaves. The interveinal spaces, starting at the tip and edges, turn pale yellow and dry-up. The symptoms are most likely to appear when leaf expansion is at a maximum. Where cropping is intensive, Mg deficiency may be encountered even on medium textured and heavy soils. Magnesium Deficiency can be mistaken for Sulphur Deficiency in Beet

Potatoes [Solanum tuberosum]

Potatoes are often affected by magnesium deficiency on light soils. The first sign of deficiency is yellowing between the veins on the older leaves. Later the yellow leaves turn brown and finally the leaves wilt, dry-up and fall. In some varieties necrosis may occur without any previous yellowing of the leaves.

Tomatoes [Solanum lycopersicum]

When tomatoes are magnesium deficient, the leaves become brittle and show a tendency to curl from top to bottom. The veins remain green while the leaf edges turn yellow and die-off. Mg deficiency adversely affects yield and quality.

Dwarf Beans [Phaseolus vulgaris]

In dwarf beans Mg deficiency is shown in yellow patches which later appear dark and necrotic. Many other legumes show similar signs.

Apple [Malus domestica]

When Mg deficiency occurs in apples, the leaves of the lower branches are dark green… then pale spots appear between the veins. These spots enlarge, turn reddish-brown and become necrotic. In typical cases, ther is early leaf-fall and the lower branches become almost bare, only the leaves at the growing point remain green

Grapes [Vitis vinifera]

Acute magnesium deficiency is easily recognises in grapes. The interveinal areas bleach, only the veins themselves remaining like fingers of whitish yellow [white wine varieties] or red[ red wine varieties] leaf surface. The lower leaves are affected first and frequently fall early.

Red Clover [Trifolium pratense]

In red clover the interveinal spaces turn yellow, the veins remaining green. Magnesium deficiency reduces the yield and lowers the fedding quality of fodder plants. Mg deficiency in the fodder can adversely affect the health of the animals.

Oil Seed Rape [Brassica napus olefera]

In rape, magnesium deficiency appears as a pale colouring between the veins. Low magnesium soils should receive supplementary magnesium fertiliser, particularly Kieserite with its additional sulphur content.

Magnesium Deficiency can be mistaken for Sulphur Deficiency in OSR.

Tobacco [Nicotiana tabacum]

In tobacco, magnesium deficiency is shown in chlorosis and yellowing starting at the leaf tips and edges. As distinct from potash deficiency the leaves seldom dry-up but quality is adversely affected.

Conifers [Pinus silvestris]

Magnesium deficiency symptoms affect the tips of the needles of the young growth of conifers, which stand out against the green of the lower needles.