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Nutrient Disorders

Posted: Tue Apr 09, 2013 10:58 pm
by chilliman64

Nitrogen (N): Plants under low N stress are smaller than normal and have an overall light-green color, especially in the lower leaves. Fruits are small with thin walls. Excess nitrogen fertilizer can cause leaf and fruit burning, especially if applied as an ammonium formulation.
Phosphorus (P): Leaves on deficient plants are smaller than normal and dark-green. Older leaves are affected first and, in severe cases, may senesce.
Potassium (K): Symptoms of K deficiency begin on older leaves and progress to younger leaves. Foliage develops bronzing and/or burning of leaf margins and may develop chlorosis. Plants are smaller than normal and produce less fruit.
Calcium (Ca): Interveinal chlorosis and leaf margin necrosis occur at the growing points in Ca deficient plants. Later, growing points die. Leaves can be distorted. Fruit may develop blossom-end rot. Excess Ca can cause white spots below the surface of pepper fruit. Open-pollinated pepper may develop stip.
Magnesium (Mg): Magnesium deficient plants develop interveinal chlorosis on older leaves which later progresses to young leaves. Interveinal tissue may become necrotic.
Sulfur (S): Older leaves of S deficient plants turn light-green and spindly.
Boron (B): When B is deficient, older leaves turn yellow and brittle and the growing points become necrotic and die. Margins and leaf tips of mature leaves become necrotic. Fruit may also be affected and develop scattered corky areas and exposed ovaries.
Copper (Cu): Copper deficiency starts as a wilt of young leaves that later turn bluish-green and curl upwards. Severely affected plants are stunted and chlorotic.
Iron (Fe): Young leaves of Fe deficient plants develop interveinal chlorosis followed by a general yellowing. The leaf midrib usually remains green.
Manganese (Mn): Young leaves deficient in Mn develop interveinal chlorosis followed by speckling or necrosis. Midribs of affected leaves remain green.
Zinc (Zn): Leaves deficient in Zn thicken and curl downward. Petioles may twist and older leaves develop an orange-brown chlorosis.

Conditions for Symptom Development:
Nutrient deficiencies are most common in acid or alkaline soils due to immobilization of nutrients. Low temperatures, soil compaction or excessive soil moisture may also affect nutrient availability. Nutrient disorders may also be caused by excessive or unbalanced use of fertilizer. Plant diseases that affect plant roots can induce nutrient deficiency symptoms due to reduced nutrient uptake.

Conduct soil and foliar nutrient analyses regularly to verify nutritional needs, design a balanced fertilizer program and correct nutrient imbalances. Alter soil pH with the addition of lime to acid soils or sulfur and acid- forming fertilizers to alkaline soils to increase nutrient availability.

Re: Nutrient Disorders

Posted: Tue Apr 09, 2013 11:17 pm
by TimEdwards

Re: Nutrient Disorders

Posted: Tue Apr 09, 2013 11:19 pm
by TimEdwards
Also worth nothing that steps to rectify the problem can take 1-2 weeks before you notice them. Things happen slowly in plants :mrgreen:

Re: Nutrient Disorders

Posted: Fri Apr 12, 2013 6:32 pm
by Mojojojo
A Larger version of tims chart + a PDF from Uni of arizona i found handy

mod edit: I removed the chart as it didn't all fit, feel free to edit yourself if you can get it to fit in the window.

Re: Nutrient Disorders

Posted: Sun Apr 14, 2013 1:25 pm
by horsebones
Wow, that FlairForm site is pretty cool. Here is the page where the flow chart diagram is from:

Re: Nutrient Disorders

Posted: Fri Apr 26, 2013 10:42 am
by horsebones
Here is one that's even easier to understand.

Lack of calcium: New leaves become curled and pale.

Lack of iron: The new leaves turn yellow (including the rib).

Lack of magnesium: Pale colour in the whole leaf, including the rib. In severe cases there is leaf drop.

Lack of potassium: Small holes in the leaves -- the leaves become thin.

Lack of nitrogen: Older leaves take on a pale green and yellow that starts its advance from the tip.

Lack of phosphorus: Leaves turn yellow with dead zones and its advancement leaf ends quickly. It's similar to Nitrogen deficiency.

Lack of sulfur: Little development which results in dwarfed and stunted plants. The leaves turn yellow. It can be confused with a lack of nitrogen.


Re: Nutrient Disorders

Posted: Mon Jun 09, 2014 7:13 pm
by scion
It is one of the best subjects of this forum, thanks for all the useful links you provided to the forum.