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Transformation of Incubated Micronutrient Chelates in Calcareous Soils
Author(s) -
Ryan John,
Hariq S. N.
Publication year - 1983
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1983.03615995004700040037x
Subject(s) - calcareous , soil water , chemistry , micronutrient , extraction (chemistry) , environmental chemistry , calcareous soils , chelation , irrigation , soil test , organic matter , incubation , agronomy , environmental science , botany , soil science , inorganic chemistry , biology , chromatography , organic chemistry , biochemistry
Micronutrient chelates have been introduced as fertilizing materials to overcome deficiencies mainly in calcareous soils, and to maintain effectiveness for a significant period of time. However, few studies have examined changes in applied chelates over a normal growing season, and some selected soil and environmental properties which influence these changes. Laboratory incubation studies, up to 168 d, were conducted to evaluate the influence of associated properties in several soils and, added CaCO 3 (0, 2.5, 5.0, and 10.0% wt/wt), temperature (5, 15, 25, and 35°C) and wetting‐drying (up to four weekly cycles) on the persistence of applied FeEDDHA and Zn‐, Mn‐, and CuEDTA. Incubated samples were extracted with water and then with DTPA‐extraction solution. Recovery varied with the metals in each soil. After 168 d, 32 to 56% of the applied Fe and <13% of the applied Cu and Zn was extracted by both solutions. Loss of Mn from MnEDTA was essentially complete within 2 d. Decreased metal extractability appeared to be related to the organic matter content of each soil. Applied CaCO 3 depressed recovery with no significant difference between application rates. Metal extraction also decreased consistently with increasing temperature and with the number of wet‐dry cycles compared to constantly moist samples. The results have implications for arid‐region soils where chelates are used under irrigation and high soil temperatures.