Making Potting Soil

This is my system for mixing my own potting soil. It was made from a recycled dryer drum. I use a microwave to pasteurize the compost when making soil to propagate from seed. The microwave is from a yard sale at $5.00. A plastic shoe box with lid fits in the microwave and usually takes about 10 min to get to 165 deg f depending on moisture content of the compost.

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The door consists of ¾” plywood, two hinges and six pull clasps. There is a 2” hole in the center of the door to permit inserting a wand of a tank sprayer to spray water just before completion of tumbling to eliminate dust from the vermiculite. The top of the door folds down to permit loading of material.
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 The top of the door folds down to permit loading of material and inspection of results after blending. I can load about 2 cubic ft or 15 gallon of material at a time. If the material is lumpy, I also add about one dozen #2 gravel (recovered after blending) to aid in breaking up the lumps.

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I don’t think the standard drive unit or motor on a dryer would handle the added weight so I used a 3/4 HP motor and a worm gear speed reducer. I also used a heavier belt from the speed reducer to the drum.

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When a batch is finished, I attach a plywood funnel to the front panel to reduce spillage. I also use a 40 gal trash can to store the soil in. I usually fill it about 2 times a yr.

 

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Categories: Greenhouse Gardening, My Gardening Journals | Tags: , | 1 Comment

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One thought on “Making Potting Soil

  1. Crystabel

    That is such a cool setup! I see your woodworking hobby paid off 🙂 .

    Like

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