I looked up some of your posts, (not all of them though) but haven't found the way I used to employ, before we installed 10 kW of PV panels, having no problems with shortages of increasing prices of electricity. All you need is a glass pane, old window or a sheet of bubble plastic, some wooden planks or some OSB, plywood or other boards, straw bales and AN (ammonia nitrate). Build a simple box of whatever materials you have on hand, place it in a dirt dug up to 50-60 centimeters deep, place tightly straw bales in it, pour AN all over, a couple of pounds per bale, and wash it into the straw with a lot of water. The straw has to be soaked with water. Then cover straw with a layer of top soil and wait a couple of days for it to heat up.
At the beginning the temperature may be too high for vegetation, but steadily in reaches the right level. Then you can seed whatever you like. The process lasts for a couple of weeks, long enough to grow proper seedlings. Of course, you need to cover the box with transparent material to let the light in during the day. You can use some blanket to cover everything after dark, to keep the heat in.
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