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library:articles:fe_basics 2010/03/17 15:36 library:articles:fe_basics 2010/03/17 15:40 current
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-Iron presents some difficulties for plant analysis also because  +Iron presents some difficulties for plant analysis also because\\  
- 1. it is often a contaminate on samples that have any dust on them   +  
- 2. Fe can exist in a leaf in a non-functional form   + 1. it is often a contaminate on samples that have any dust on them\\  
- 3. a crop may respond to foliar Fe due to a low Fe:Mn ratio in the tissue, even when Fe is adequate by "critical level" standards.+ 2. Fe can exist in a leaf in a non-functional form\\  
 + 3. a crop may respond to foliar Fe due to a low Fe:Mn ratio in the tissue, even when Fe is adequate by "critical level" standards.\\
^  Recommended Rates  ||| ^  Recommended Rates  |||
-^ Method ^ Rate  | +^ Method ^ Rate  | 
-| Broadcast: | Not Recommended  | +| Broadcast | Not Recommended  | 
-| In-row<sup>a</sup>: | Follow label rates  | +| In-row<sup>a</sup> | Follow label rates  | 
-| Foliar<sup>b</sup>: | 1.0 to 2.0 lb./A  |+| Foliar<sup>b</sup> | 1.0 to 2.0 lb./A  |
<sup>a</sup>Certain proprietary chelated Fe products appear to be effective when applied in the row, otherwise only foliar Fe is recommended. \\ <sup>a</sup>Certain proprietary chelated Fe products appear to be effective when applied in the row, otherwise only foliar Fe is recommended. \\
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Be concerned if visible symptoms are evident, since this indicates serious reductions in growth has already occurred. Annual corrective applications to solve Iron deficiencies can be both expensive and difficult. It is best to try and understand, then control the interaction which caused the Iron problem. Often a simple reduction in the application rate of Phosphorus or proper liming more easily solves the problem. Where an excessively high soil pH is the cause, be aware that acidifying the soil is very expensive, and not normally cost-effective for agronomic crops. Be concerned if visible symptoms are evident, since this indicates serious reductions in growth has already occurred. Annual corrective applications to solve Iron deficiencies can be both expensive and difficult. It is best to try and understand, then control the interaction which caused the Iron problem. Often a simple reduction in the application rate of Phosphorus or proper liming more easily solves the problem. Where an excessively high soil pH is the cause, be aware that acidifying the soil is very expensive, and not normally cost-effective for agronomic crops.
^  Some common fertilizer products containing Iron  ||| ^  Some common fertilizer products containing Iron  |||
-^ Product ^ Chemical Formula ^ Typical Iron Content  | +^ Product ^ Chemical Formula ^ Typical Iron Content  | 
-| Ferrous Sulfate | FeSO<sub>4</sub> !BULLET 7H<sub>2</sub>O | 20%  | +| Ferrous Sulfate | FeSO<sub>4</sub> !BULLET 7H<sub>2</sub>O | 20%  | 
-| Ferrous Ammonium Sulfate | (NH<sub>4</sub>)<sub> 2</sub>SO<sub>4</sub> !BULLET FeSO<sub>4</sub> !BULLET 6H<sub>2</sub>O | 14%  | +| Ferrous Ammonium Sulfate | (NH<sub>4</sub>)<sub> 2</sub>SO<sub>4</sub> !BULLET FeSO<sub>4</sub> !BULLET 6H<sub>2</sub>O | 14%  | 
-| Iron DPTA Chelate | FeDPTA | 10%  | +| Iron DPTA Chelate | FeDPTA | 10%  | 
-| Iron HEDTA Chelate | FeHEDTA | 5-12%  |+| Iron HEDTA Chelate | FeHEDTA | 5-12%  |
 
library/articles/fe_basics.txt · Last modified: 2010/03/17 15:40 by bill