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Maize Deficiencies

Magnesium  deficiency appears in lower leaves as yellow or white streaking between veins. The leaves eventually become reddish-purple, and the edge and tip die if the deficiency is severe.  The soils most likely to be deficient in Mg include acidic and sandy soils.



Nitrogen deficiency makes the older leaves turn pale or yellowish-green. The deficiency then starts to create a V shape, starting at the tip of the leaf. If the problem continues, the deficiency works its way up the plant from older to newer leaves. The stalks tend to be thin and spindly. Nitrogen deficiency develops commonly in wet to saturated soils or under cool soil temperatures in the spring.  Deficiency can be induced  when soils tend to be dry and can also occur in soils with large amounts of low-nitrogen-containing residues.



Potassium  deficiency is observed as yellowing and necrosis (death) of the edge of older leaves. When the problem persists, this deficiency will continue to move up from older to newer leaves, while the top leaves may look completely green. Potassium  deficiency can cause lodging of the crop later in the season because stalks are thin and not strong. Soil conditions that restrict root growth can induce deficiency, especially at early stages of development when the root system is small.



Phosphorus  deficiency causes a distinct dark green with reddish to purplish leaf margins, typically starting from the tip and is usually observed in the older leaves. Stunted growth is also typical.  Phosphorus deficiency symptoms normally disappear by the time the plant is waist-high. Since P is fairly immobile in the soil, any soil condition that limits root growth - cool temperature, wet or very dry conditions, compaction can induce the deficiency.



Maize has a medium manganese requirement. As this nutrient is highly immobile in the plant deficiency symptoms are first seen in the young leaves. A  deficient plant is recognised by interveinal chlorosis (yellowing between the veins of the leaves) while the veins themselves remain dark green.  Manganese deficiency looks similar to magnesium deficiency but the latter occurs in older leaves. Manganese deficiencies are most likely to occur on high pH soils and on organic soils. Under dry conditions the availability of manganese is likely to be reduced.


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