Plant Deficiencies

The following info was taken from various website:
http://www.thekrib.com/Plants/Fertilizer/nutrient-deficiency.html
http://www.csd.net/~cgadd/aqua/art_plant_nutrient.htm
http://www.theplantedtank.co.uk/deficiencies.htm

Boron (B)
Effecting new leaves
Symptom: Dead shoot tips and side shoots, brittle stems, similar to calcium deficiency.

Calcium (Ca)
Effecting new leaves
Symptom: Distorted leaf growth, cupped leaves, twisted and bend leaves, twisted and short roots, damage and die off of growing points, yeloow leaf edges

Carbon Dioxide (CO2)
Effecting new leaves
Symptom: Slow growth, Distorted leaf growth, possible calcium deposits on leaves

Copper (Cu)
Effecting new leaves
Symptom: Dead leaf tips and withered edges

Iron (Fe)
Effecting new leaves
Symptom: Pale growwth of new leaves, yellowing of leaves, Greenish nerves enclosing yellow leaf tissue

Magnesium (Mg)
Effecting old leaves
Symptom: Yellow spot, Similar to iron as it prevents plant from absorbing iron, yellowing of old leaves starting from edges while major veins remain green, the plants may also become reddish from the presence of the red pigment anthocyanin.

Manganese (Mn)
Effecting new leaves
Symptom: Dead yellowish tissue between leaf nerves

Molybdenum (Mo)
Effecting old leaves
Symptom: Yellow spots between leaf nerves, brown edges, inhibited flowering

Nitrogen (N)
Effecting old leaves
Symptom: Stunted growth, leaves turn yellow and die off, the plants may also become reddish from the presence of the red pigment anthocyanin.

Phosphorus (P)
Effecting old leaves
Symptom: Stunted growth, sometimes leaves become darker green, poor root growth, symptoms can be similar to nitrogen deficiency

Potassium (K)
Effecting old leaves
Symptom: Pinholes appear in older leaves which slowly enlarge, yellow patches, curling leaves, stunted growth, withering of leaf edges and tips

Sulphur (S)
Effecting new leaves
Symptom: Leaves turn yellow and die off, similar to nitrogen deficiency

Zinc (Zn)
Effecting old leaves
Symptom: Yellowish areas between nerves starting at tip and edges

I found this great picture summarize plant deficiency from the net.