The best thing to add to clay soil is organic matter such as compost, added yearly; gypsum only helps sodic clay, and fine sand makes clay worse. Expect the top layer to improve in one season and real structure in two to three years.
The best thing to add to clay soil is organic matter such as compost, added yearly; gypsum only helps sodic clay, and fine sand makes clay worse. Expect the top layer to improve in one season and real structure in two to three years.