Remember, it is well to acidify by degrees. Your soil may need another application. Now, get a handful of your soil. You can adjust your soil to the correct texture by adding a half inch of clay soil to a sandy soil or 3 inches of sand to a clay soil, working the material into the top few inches of your soil. Leaf mold, peat moss, or other weed-free organic matter can profitably be added 'to most soils every few years.
Humus material is excellent -to condition soils that crack badly in summer.
New chemical soil conditioners show promise of being the solution to problems of excessively heavy, clay-type soils. As this is written there does not seem to be enough practical, over-all experience to warrant a conclusive recommendation. We firmly believe that chemical soil conditioners will play an important part in gardening in years to come. Presently, we recommend that you try only small experimental quantities if you are troubled with heavy soils.