Soil Testing Compaction Test :- Soil compaction occurs when soil particles are pressed together, reducing pore space between them . Heavily compacted soils contain few large pores, less total pore volume and consequently a greater density. A compacted soil has a reduced rate of both water infiltration and drainage. This happens because large pores are more effective in moving water downward through the soil than smaller pores. With increasing farm size, more acres need to be covered each day to conduct field operations in a timely manner. The width and weight of field equipment is increasing and so is the horsepower of the tractors needed to pull them. The weight of tractors has increased from less than 3 tons in the 1940's to approximately 18 tons today for the big four-wheel-drive units. Wheel traffic is without a doubt the major cause of soil Compaction