Phosphorus encourages root development increasing crop yield and resistance to disease. It is important stuff.
This test begins the same as the others with a solution put in the test tube to mix a little of the soil in and shake. Then, after the soil is settled, the liquid is drawn up by eyedropper and put into another clean test tube.
A different chemical tablet is added and then, the test tube is shaken till the tablet dissolves, making a blue color appear.
We compare the resulting blue liquid to a chart to see what the result is. Results can be anywhere from trace to high levels of Phosphorus.