I started a series on soil testing back here , in which I explained a few simple tests to work out the clay/silt/sand content of soil and the pH. I was always going to come back and explain dispersion, but the truth was, I didn't really know WHY dispersion was important at that time. I have since done a course on erosion management and it all became clear. However, dispersion is not really important for garden soil or for farming, so I never came back to finish the series. Dispersion is very important when it comes to using soil to construct things like dams and roads, and when you start to get erosion problems. We just had a dam built, so I came back to dispersion and soil testing, so its time to finish that series! We asked our neighbour to come over with his buldozer and build us a farm dam near the house. He thought that the soil wouldn't be any good where I wanted the dam. So throughout the digging process we grabbed multiple sam...