Cultivation and soil structure - Department of Primary,
D7. Cultivation and soil structure D7.4 Vegetable SOILpak DIRECT DRILLING Direct drilling is a technique where crops or pastures are sown into uncultivated soil. In general, the soil is disturbed only in a narrow slot along each sowing line. This technique offers many benefits to growers, since the soil structure will improve over a number of,Wells and Well Drilling - building, depth, important,,Casing, Screen, and Seals. The sanitary seal is the top covering of a well. Its function is to keep insects, small animals, dirt and debris from entering the well and contaminating the aquifer .This cap usually has an access port that allows periodic water-level measurements, and may have a screened breathing tube to allow air pressure to equalize as water levels rise and fall in the well.ARCTIC ICE AND DRILLING STRUCTURES,All structures in the area were <in 1984> of the exploration type. Types of bottom-founded structure reviewed include artificial islands, caisson-retained islands <CRIs>, the SSDC <Dome's Single Steel Drilling Caisson -- see Abstract No. B62282, May 1984>, the Super CID <Global Marine's Super Concrete Island Drilling system>, and the MAC <Gulf Canada's Mobile Arctic Caisson>.