Its 5 months old seedling (Length about 27cm, leaves 6) of A. marina emerged from seed under submerged conditions in lab (Temp. 24±2 °C, under florescent light LUX 608 average). 3 Liter of modified Hoagland nutrient solution (Jian et. al., 2019) in 25% autoclaved filtered sea water, is used to maintain submerged condition. The final pH and EC of solution were 6.23 and 17.00 mS/cm respectively. This solution was changed on monthly basis. But after 4 and half months the leaves (except top pair of new leaves) getting burn from tips (as seen in attachments). I am in search of possible cause/causes and solution of this leaves burning, So please contribute in my searching.
Jian, L., Jingchun, L., Chongling, Y., Daolin, D., & Haoliang, L. (2019). The alleviation effect of iron on cadmium phytotoxicity in mangrove A. marina. Alleviation Effect of Iron on Cadmium Phytotoxicity in Mangrove Avicennia marina (Forsk.) Vierh. Chemosphere.
When fertilizers are not properly hydrolyzed they are not always made available to the plant and the compounds readily form their salts inside the leaf causing browning of the tip in general. It is more readily caused by inability of the plant to absorb nutrients through root dysfunction, irregular hydration, shortage of moisture, physiological dryness, metal toxicity etc. In addition to that the position of the light source too close to the tips of the leaves also cause physical damages to the leaves.
Yes, I agree with Abhishek Mukherjee It could be potassium deficiency or water deficiency :)
Abhishek Mukherjee Andrew Paul McKenzie Pegman Thank you so much for your answers. Water deficiency w.r.t. to water depth or availability?
Respected reviewers! One thing more, today I notice the color of root (From Opaque pot) of same plant, the color of some roots turned to black from white. Now what you suggest on priority basis to solve that problem!
1. Decrease the EC of water or
2. Increase the changing frequency or
3. Increase nutrient solution strength or
4. Decrease the water level or
5. Any other suggestion
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