The highlight of hydroponics systems is that you have full control over the nutrient level of your hydroponic plants. But, this can be a drawback because you have to be extra careful in how to alter your hydroponic nutrients to get best growth. Listed below are common symptoms of a few important nutrient solutions deficiency.
(1) Nitrogen: If your hydroponic plants are suffering from nitrogen deficiency the leaves may change their color to pale green and yellowish in extreme nitrogen deficiency cases. Also, you may see a light purple tint on the stems and the leaves. However, if your there is excess nitrogen the roots of your hydroponic plants may become stunted and may cause slow flowering.
(2) Phosphorus: Phosphorus deficiency may result in small roots and flowers and dark leaves with red or purple appearance. Not necessarily the deficiency of phosphorus may occur due to lack of phosphorus in plants, it may occur due to nutrient solution being cold, which may result in the decrease of nutrients uptake by your hydroponic plants.
(3) Potassium: Potassium deficiency will result in blackened leaves with dead, brown spots. These symptoms occur on old leaves in the start. Potassium deficiency also results in lighter and weaker hydroponic fruits and flowers.
(4) Magnesium: This deficiency will be seen when your leaf turn yellow from edges. This deficiency is most commonly found in tomato plants.
(5) Calcium: Calcium deficiency is usually seen in young plants than the older ones. These affected leaves will look abnormally small and mangled.
(6) Iron: Like Calcium iron deficiency also shows its symptoms on younger leaves. In severe instances leaves look pale and white. Iron deficiency may be caused because of extreme cold water and not because of deficiency in the hydroponics nutrient solution.
(7) Manganese: Manganese deficiency affects older leaves. However, if there is excess manganese provided to the plants it will result in iron deficiency.
(8) Copper: Copper deficiency is very rare among plants because plants don’t need copper. But, copper deficiency is possible in plants that may result weak and distorted young leaves. Also, over supply of copper to your hydroponic plants create roots that are abnormally darker and may decrease branching.
(9) Boron: Less boron may result in abnormally dark leaves. Boron deficiency further results iron deficiency.
(10) Molybdenum: This deficiency results in dark and curly leaves; it will result in unusual small leaves.
Ref: http://www.softsia.com/hydroponic-nutrients-download-gsnd.htm
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