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I've wanted to dry fruit/veg and had an idea to place the trays in a box with air filters at the top and bottom. The box would use the hot air in the attic as the drying source. In Toronto attic temps can easily reach 50C and generally it's pretty dry in the summer due to sun radiating heat through the roof for 12+ hrs a day. The attic's insulation is fiberglass with a thick layer of blown cellulose on top. Preventing any contamination is my only worry.
Part of my vegetable garden is on a slope along the side of the house. When watering it easily runs downhill and doesn't soak into the soil. I stuck 2.5 inch rings from a 2L bottle then cut in half to form a semi-circle placed into the dirt to act as a wall to hold in the water. These mini terraces do a good job of allowing the water to penetrate instead of running away.