Abstract
Humic substances have significant practical implications regarding the transport and availability of micronutrients to plants. Nutrient solution studies were conducted to evaluate Fe-humate complexes as a iron source to plants. A short term Fe-humate absorption study was conducted using excised barley roots, while long term absorption studies were conducted using sunflower andSpirodella intermedia. Humic acid was extracted with 0.5N NaOH from a Typic Argiudol, A horizon, and purified with exhange resins and EDTA. The Fe-humate was obtained by passing purified humic acid through a cation exhange resin saturated with iron using59Fe as a tracer. In the short term, absorption studies, the absorption of iron by barley roots was insensitive to metabolic inhibitors, low temperature and anaerobiosis. This may be due to a strong adsorption or precipitation of Fe-humate in the root free spaces masking the absorption. However, long term studies indicated that Fe-humate was a good source of iron which was readily absorbed and transported to the shoot.
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Lobartini, J.C., Orioli, G.A. Absorption of iron Fe-humate in nutrient solutions by plants. Plant Soil 106, 153–157 (1988). https://doi.org/10.1007/BF02371209
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DOI: https://doi.org/10.1007/BF02371209