LDSF Extractable Iron (Fe)
Essential for synthesizing chlorophyll, iron (Fe) is involved in nitrogen fixation and photosynthesis. Iron deficiency is often not due to insufficient iron supply, but rather iron availability. Conditions associated with that include: carbonate levels in the soil, salinity, soil moisture, low temperature, and concentration of other elements (competitive microelements, phosphorus, calcium) (Singh 2008). In high pH soils, it becomes difficult for plants such as rice to absorb iron (Ishizuki, 1971). High M-3e Fe levels indicate potential for high P absorption capacity in acid soils.
Fe concentrations of 29% of the soils sampled in both the higher and lower elevation sites exceeded the high-end threshold and may impact P absorption though the phosphorus sorption index does not indicate soils are strongly P adsorbing.
There were no differences in Fe concentrations among LULC class, slope, or elevation.
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