For micronutrient elements analysis, inductively coupled plasma optical emission spectrometry (ICP-OES) was used to measure elemental levels of Fe, K, Mg, Mn, P, and Zn. Specifically, homogenized dry soil (50 to 100 mg) and sand (100 to 200 mg) samples were dissolved in the vessels with 8 ml of nitric acid together with negative control, which only include nitric acid and samples spiked with all the standard (6 ml of nitric acid + 2 ml of standards mixture). Samples were digested using microwave digestion. After the digestion, ddH2O was added for a final volume of 25 ml. Samples were centrifuged, and the supernatant was collected for ICP-OES analysis. For the C, H, N, and S elemental analysis, 5 to 20 mg of homogenized dry soil and sand samples were analyzed with a CHNS Elemental Analyzer (LECO), and sulfanilamide was used as a standard.

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