Please help to identify the nutrient deficiency - The Planted Tank Forum
 
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post #1 of 6 (permalink) Old 09-13-2014, 07:49 PM Thread Starter
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Please help to identify the nutrient deficiency

Anyone can shed some light on what is the deficiency of my hygrophila polysperma? As can be seen in the photo the new leaves is losing white color vein. Thank you in advance.
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post #2 of 6 (permalink) Old 09-13-2014, 11:39 PM
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If the blade between the veins is getting pale (that is what I see) then it could be either of several nutrients.
Nitrogen is a common one, especially in a high tech tank with few fish.
Phosphorus is another one that is often low, but usually plants can find some.

Are you adding fertilizers?
How much light and for how long?
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post #3 of 6 (permalink) Old 09-14-2014, 07:38 AM Thread Starter
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Yes I am adding dry fert KNO3 and KH2PO4.

Lighting is 150w x2 mh bulb with 8hours photoperiod.

Will try to increase my nitrogen and phosphorus dosage and see how it goes. Initially I thought of iron deficiency due to the pale new leaves but other red plants seems doesn't suffer from it.

Anyway I seems to always have issue in growing H.polysperma the way I want it to. The veins tend to loose its distinct white color
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post #4 of 6 (permalink) Old 09-14-2014, 03:07 PM
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How much potassium nitrate and potassium phosphate are you adding?

Also, 2 metal halide bulbs seems to be overkill for a planted tank.

Anthony


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post #5 of 6 (permalink) Old 09-16-2014, 09:25 AM Thread Starter
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Currently dosing macro KNO3, KH2PO4, KCL and micro Plantex CSMB & EDTA FE at alternate day every week, 3 times per week

1 tsp KNO3
1 tsp KCL
1/4 KH2PO4

1/2 Plantex CSMB
1/2 EDTA Fe

Is my dosage suitable? Tank dimension 5 x 2 x 2ft
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post #6 of 6 (permalink) Old 09-16-2014, 01:11 PM
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5' x 2' x 2' is 150 (American) gallons. EI method is based on American gallons.

Quote:
1/4 KH2PO4

1/2 Plantex CSMB
1/2 EDTA Fe
are these also teaspoons? (ie: 1/4 tsp KH2PO4 and 1/2 tsp each CSM+B and Fe?)

EI for this tank would be double this formula (Copied from the sticky at the top of this forum)
60~80gal
50% H20 change-weekly
3/4 Tsp-KN03 3x a week
3/16 Tsp-KH2P04 3x a week
1 Tsp-GH booster once a week
15ml 3/16Tsp-Trace 3x a week
Optional
4-8ml-Fe/Iron 3x a week

So I think you are not too far off.

I use the same amount of CSM+B as I use of KH2PO4, and about 25% of that much of iron (I also am using a chelated iron, but I think it is not EDTA Fe)

Do you have a test for NO3?

Note the EI method assumes you are using KNO3, and this is the source of both K and N.
If you are using K2SO4 for some of the K, then the tank might be short of N. You could try using a bit less K2SO4 and a bit more KNO3.
I do the same thing: working back and forth with the K2SO4 and the KNO3, trying to keep the NO3 sufficient but not too high while still supplying the K in sufficient quantity.
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