The following is from New Mexico State University's "ABCs of Making Adobe Bricks."Select a site that is near a suitable soil and has a large level area for drying and curing the bricks. Dig a pit about 2 feet deep and of any convenient size for mixing. Before you start mixing, soak the pit thoroughly for at least 12 hours to saturate the retaining perimeter.When you are ready to start, put some soil in your pit and add just enough water, mixing as you add, to make a stiff mix. You may wish to add straw or dried manure to your mix. Although this may be the local customs, it is not structurally necessary.Transport the mix to the drying area. The drying area should be sprinkled with dry sand or straw to prevent the wet blocks from binding to the surface of the drying area. Fill the forms with the mix and compact the corners thoroughly. With a straight edge, strike off the form and "gently" remove it, leaving the wet adobe bricks to dry for several days (at least three) before handling. Wash and reuse the forms immediately, but do not disturb the bricks. After several days, the bricks should be strong enough to be turned so that drying can continue. But they will not be strong enough to be handled roughly for three or four weeks, depending on weather conditions during the drying time. However, if showers are prevalent during the brick-making season, you should stack the partially cured adobe in loose ricks and protect them as much as possible from moisture.Adobe bricks gain strength with drying time, provided they are not exposed to rain or other moisture. Protect your work, but remember that the wind and the sun are you drying agents, and use judgment, too.Don't build with adobe unless labor is cheap or free. Adobe bricks are cheap only when labor is cheap.Read the rest here.