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未閱讀文章發表於 : 2002-10-28 14:12 
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註冊時間: 2002-05-28 18:16
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來自: 香港南區
有沒有人用過NH4NO3(硝酸銨)作為氮肥 ? NH4NO3 比 KNO3
更容易被吸收

警告: NH4NO3(硝酸銨) 是有爆炸性的


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未閱讀文章發表於 : 2002-10-28 14:22 
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註冊時間: 2002-09-14 10:53
文章: 451
來自: Tseung Kwan O
Probably not a good idea.
NH4(ammonium) is slightly toxic than NO3 for fish.
Also, in high Ph, ie >7, NH4 will form highly toxic NH3 (ammonia) and poison your fish.
If u want to use it as a source of N, use it sparingly.
If u have a good bacteria colony, they will probably convert them to NO3 quickly.


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未閱讀文章發表於 : 2002-10-29 12:45 
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註冊時間: 2002-05-28 18:16
文章: 412
來自: 香港南區
I suspect some of the commerical fertilizers use ammonium salt as the form of nitrogen in addition to nitrate. Curious to know what kind of ammonium salt they are using. There is a new product from Seachem called Flourish Nitrogen (not available in HK yet) contains complexed ammonium as the source of nitrogen of which can be readily absorbed by plants.


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未閱讀文章發表於 : 2002-10-29 14:07 
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註冊時間: 2002-09-14 10:53
文章: 451
來自: Tseung Kwan O
On the ease of plant absorption of nitrogen, they are (easiest to difficult):
ammonia/ammonium, nitrite, nitrate.
However, ammonia is highly toxic, ammonium/nitrite less toxic, and nitrate is pretty safe.
In a nitrogen cycle, the bacteria convert:
Nitrosomonas: ammonia/ammonium to nitrite
Nitrobacter: nitrite to nitrate

So in a well-established tank, the ammonium should be quickly converted to nitrate. So i am also interested in knowing how seachem keep the ammonium ions fixed, so that it is not converted to ammonia or nitrate. I have emailed to ask Dr. Morin of Seachem about that product. Once i get the reply, i will post it out.


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未閱讀文章發表於 : 2002-10-30 11:13 
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註冊時間: 2002-09-14 10:53
文章: 451
來自: Tseung Kwan O
This is the reply i got from Greg Morin of Seachem:

>I notice u have a new product called Flourish nitrogen. On your
>company's website,
>this product is said to contain half nitrate and half ammonium.
>I have a few questions need clarifying:
>1. In what form does the Ammonium exist? In high pH, i believe
>ammonium will easily convert to
>the highly toxic ammonia.


The ammonium is complexed in such a way that it is not easily
converted into free ammonia or ammonium ion itself in the tank
environment. The exact nature of the complexation is propietary but I
can tell you that is more of a covalent nature than ionic.

>2. Wouldn't the ammonium be converted quickly to the nitrate form by
>the nitrobacter in a well established tank?


As I stated above, it is not actually free ammonium ion so the extent
of any potential conversion is greatly minimized. There may be some
low level conversion going on, however our studies showed a clear
difference in growth response between using nitrate alone vs our
complexed ammonium alone. If our complexed ammonium were being
entirely converted to nitrate and then used by the plants we would
have expected to see similar growth respones in both cases.

From the answer, it seems that the ammonium exists not in the form of inorganic salt, but binded to an organic compound/complexes with covalent bonds. Sort of like the idea of edta. Maybe be some sort of amino acids (??)


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未閱讀文章發表於 : 2002-10-31 09:15 
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註冊時間: 2002-05-28 18:16
文章: 412
來自: 香港南區
Good work. Interest to know the result of this new kind of nitrogen fertilizer.


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未閱讀文章發表於 : 2002-10-31 09:32 
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註冊時間: 2002-09-27 08:22
文章: 203
來自: BayArea, CA, USA
Didn't know they have new product coming out.... :-n06

Too bad, only 50% is of ammonium and other 50% is nitrate.

Don't we already have enough nitrate in our tank :j

Wonder if this is the only way to keep their "ammonium" stable in the bottle :j

I am actually switching over to use Topica Master Grow.


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未閱讀文章發表於 : 2002-10-31 10:06 
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註冊時間: 2002-05-28 18:16
文章: 412
來自: 香港南區
What I find in my tank is that the Nitrate level is less than 5 ppm, therefore I have started to add potassium nitrate (very cheap, HKD20. per pound) to maintain the nitrate level to 5 to 10 ppm (mg/L). But still interest to find some other effective source of nitrogen.


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未閱讀文章發表於 : 2002-10-31 11:11 
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註冊時間: 2002-09-14 10:53
文章: 451
來自: Tseung Kwan O
In a planted tank with vigorous growth, nitrate is always at very low level. In fact, many experienced tank keepers in the west (US, Europe) actually add nitrate to their tank to bring it up to 5-10ppm and have no problem with algae! I also add nitrate(KNO3) to my tank and one can almost instantly observe the effect, ie after 0.5 hr, plants are bubbling much more readily. K is another element needed in good conc for plant (20-40ppm, quoted from a US source), i add K2SO4 for that. (Seachem has a product for that purpose called Flourish Potassium.)

There are actually 2 schools of thought on fertilizing and algae control: 1. Starve the algae by limiting nutrients.
2. Feed them to death.

My opinion is (1) good for newly established tank, when plants are still weak and not adapted to the water.
(2) is good when plants are growing strongly. Cuz if u limit certain nutrient, plant growth is stunted and algae will seize the opportunity to outcompete.

Alex: one pound will last u for whole life!! $20 is cheap, where did u get them? Do they sell K2SO4 cheap too?


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未閱讀文章發表於 : 2002-10-31 13:06 
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註冊時間: 2002-05-28 18:16
文章: 412
來自: 香港南區
Alan, I don't know if they have K2SO4. This shop is small and don't have all the things we need. But they have FeSO4.
They are not selling high grade chemicals.

chemical store for information
SHIU SHING HONG, 130A JERVOIS ST., SHEUNG WAN,
TEL: 25445964


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未閱讀文章發表於 : 2002-10-31 15:49 
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註冊時間: 2002-09-27 08:22
文章: 203
來自: BayArea, CA, USA
It will only be true if fish load is low.

For me, I have more than enough nitrate to give away.... :-n06 Thanks to my discus and altum.


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