If you can get some fresh mushroom compost use as much as you can. It is fairly basic and doesn't need any lime but does need some regular soil to help it hold water as well as some alfalfa meal or pellets and some water crystals to keep the moisture level steady.
If you can't get fresh mushroom compost, I would use fresh compost, horse or cow manure (composted if possible), lime or basic slag, sand and soil, perlite, alfalfa pellets, and water crystals. Once the carrots get a couple of inches tall it would be good to mulch with something fine like grass clippings to stop the top of the soil from drying too fast. Fertilize with a soluble fertilizer every 2 weeks or so and pick them before the temps get too hot. My last crop of carrots were planted in late January and may be too late for down here; but the ones planted in October and November are now producing some really sweet carrots, despite the heavy rains.
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