On Monday I ordered a truckload of mined gypsum for the farm. Gypsum is famous for two things: flocculating clay particles and providing a great source of calcium. We all need lots of calcium for growth, and flocculation is a wonderful thing for our soil. If you can imagine, the soil particles can form wet plates, which are difficult to separate. The gypsum’s properties put spacers between the plates, allowing other nutrients to bond to the clay particles and form a nice crumb structure in the soil. We will be putting it on the beds for the tomatoes and the beds for the potatoes. Gypsum is calcium sulphate and the amount that can be applied is determined by the sulfur level in our soil sample. This was tested last year, so we know we can safely apply it without overloading the soil with sulfur. Sulfur is an important plant nutrient that we need to maintain in balance in the soil with all the other ones.

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