Citrus Growers Forum

Evaldas · Posted: Sat 14 Jan, 2012 9:06 am

Hi,
I've been fertilizing my citruses with a fertilizer that contained 0.06% Fe and I haven't had any problems with iron deffiency, but now I bought one that contains 0.03% Fe. Will it be too litte?

danero2004 · Posted: Sat 14 Jan, 2012 2:23 pm

I've always used 0.20 and not 0.02 , it seems too litle ,my guess Very Happy

Evaldas · Posted: Sat 14 Jan, 2012 5:37 pm

danero2004 wrote:

I've always used 0.20 and not 0.02 , it seems too litle ,my guess Very Happy

I would assume that it states the mass of iron chelate, which contains 13% iron, so in such case the fertilizer would contain ~0.026 pure iron.

danero2004 · Posted: Sat 14 Jan, 2012 5:53 pm

Now I can not find it anymore , but I was using this mixed with the 23-6-10 from Scotts (Everris now)

This one have 0.16% Fe in it.

Now I've got a 0,20 % Fe , a fertilizer for azalea , gardenia , ....acid lovers , and mix it with the 23-6-10-3Mg0 from Scotts , from time to time , to add some acidity back and to add some Iron too.

Hope it helps.
Daniel

Evaldas · Posted: Sat 14 Jan, 2012 6:36 pm

I had always been using "Substral" fertilizer for citrus, except it was in a different bottle, and mine was NPK 6-4-6...
And here it says that the fertilizer you've shown is also 6-4-6
The new, 0.03% Fe, fertilizer, also "Substral" is 6-1-5, and your, 0.16% Fe, was 23-6-10 which is about four times more concentrated, which means you'd have to dilute it more.

danero2004 · Posted: Sat 14 Jan, 2012 7:00 pm

I don't know about the new one , but the same bottle as shown in the picture had or have 0,16% Iron , so why should I dilute it since the producer said to use the regular dose of it

And had some green leaves too.

Universol 23-6-10 from scotts have only 0,06% Iron so it is weak on Iron feeding.

Daniel

Evaldas · Posted: Sat 14 Jan, 2012 8:18 pm

danero2004 wrote:

I don't know about the new one , but the same bottle as shown in the picture had or have 0,16% Iron , so why should I dilute it since the producer said to use the regular dose of it

And had some green leaves too.

Universol 23-6-10 from scotts have only 0,06% Iron so it is weak on Iron feeding.

Daniel

Because if it is a NPK 23-6-10 fertilizer with 0.16% iron you would have to use 1.07 ml of it per 1 litre of water in order to fertilize your citrus at 250ppm nitrogen, and with this amount you would automatically put in ~0.2g of iron into every litre of water ("~" because it depends on the density of the fertilizer, I calculated using 1.2g/ml). Now if you use NPK6-4-6 0.06%Fe you would have to use 4.11ml/l for 250ppmN and you would put ~0.3g/l of Iron (again fertilizer density 1.2g/ml).
So to conclude 0.16% of iron in a NPK23-6-10 fertilizer is less than 0.06% of iron in a NPK6-4-6 fertilizer

danero2004 · Posted: Sat 14 Jan, 2012 8:44 pm

Evaldas wrote:

So to conclude 0.16% of iron in a NPK23-6-10 fertilizer is less than 0.06% of iron in a NPK6-4-6 fertilizer

6-4-6 have the 0,16 ratio Laughing