Re: additional iron

[Gregg Kitagawa <splab@flash.net>]

Walter Nelson wrote:
> 
> for better foliage color and test results that show low iron levels
> chelated iron is desirable for production of this poinsettia crop
> a multiheaded injector is used
> tank 1 combination sulfuric acid and phosphoric acid
> tank 2 calcium and potassium nitrate in second
> tank 3 excel 21-5-20
> additional iron in first tank is precipitating
> Will it not precipitate if put into second one too?
> How about third tank?
> Where might you put it?  alternate the iron with another material in one of
> the  existing tanks?
> Fourth head is a new purchase we want to avoid
> thanks for ideas
> Cheers,
> Walter N Nelson
> Extension Educator, Horticulture
> 
> e-mail wnelson@cce.cornell.edu
> voice 607.734.4453
> FAX 607.734.7740
> s-mail 425 Pennsylvania Ave.
>           Elmira NY 14904
Chelates of iron, zinc, copper and manganese are incompatible with
phosphoric acid, sulfuric acid and nitric acid and shows reduced
solubility with ammonium phosphate.  It is compatible with calcium and
potassium nitrate and most other materials.  Off the top of my head I
don't know what excel 21-5-20 is derived from.  Am faxing you a liquid
fertilizer concentrate compability chart.
Gregg
-- 
Gregg Kitagawa 
Consultant
Soil & Plant Laboratory, Inc.
Phone 408-727-0330
e-mail:  splab@flash.net