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    Deep Freezer Hash

    Put a 3D printed tumbler with electric motor in a plastic bin that all fits in a deep freezer. Add a few marbles and dry ice and run tumbler for about 6 minutes. Tumble in a mesh net thats less than 160 micrometer.
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    Gypsum (CaSO4·2H2O) added to Promix HP for Sulfur?

    How well can one mix the soil to have even nutrient distribution? I doubt any two samples are alike. An average or an uncertainty value is needed.
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