Full TGIF Record # 21398
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Publication Type:
Author(s):Robey, Mel
Author Affiliation:Director, turfgrass management program, College of the Desert, Palm Desert, CA
Title:Iron chelates
Source:Golden State Fairways. Vol. 3, No. 4, May 1991, p. 13.
Publishing Information:Las Vegas: R/K Communications Group, Inc.
Keywords:TIC Keywords: Iron chelates
Abstract/Contents:"The ability of plants to utilize iron is influenced by the pH of the soil. Availability of iron is influenced by a factor of 100 times for each one point change in the pH. Other factors which decrease iron availability are low concentrations of iron in the soil, cold and wet soils and droughty conditions. "Unavailable iron is in the ferric(Fe+++) ionic state, often forming insoluble compounds such as ferric hydroxide in the soil. When the iron becomes tied up in the soil, the grass plants will develop deficiency symptoms. Water soluble forms of iron have a very short soil resudual. Once applied, the ferrous iron is quickly converted to the insoluble ferric iron. To prevent the iron from becoming insoluble when applied, different types of chelating agents have been manufactured." These organic molecules hold the iron in a form which increases its residual activity. When choosing a chelated iron it is important to understand their different characteristics, especially their effectiveness in alkaline and acid soils."
Note:Correction as noted in 3:6 of Golden State Fairways: Two sentences in the first paragraph should read "Availability of iron is influenced by a factor of 10 for each one point change in the pH. For example, iron would be 10 times less available to plants growing in a soil with a pH of 6.0 as compared to 5.0."
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ASA/CSSA/SSSA Citation (Crop Science-Like - may be incomplete):
Robey, M. 1991. Iron chelates. Golden State Fairways. 3(4):p. 13.
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