They say mixing gypsum with clay, from Ed Hume Seeds;
Are clay or hardpan problems in your garden? Gypsum may be just the answer to help break -up and loosen the soil structure. It's not a miracle and it doesn't work over-night, but a three-year program of yearly applications should help improve poor soil conditions. It's easy to apply and relatively inexpensive for the job it does. Gypsum is easy to apply! Simply spread it on the lawn with a lawn fertilizer spreader, at the rate of 40 pounds per thousand square feet. When preparing new soil for planting flowers, shrubs, vegetables or a new lawn, mix 20 to 30 pounds of Gypsum per one thousand square feet of heavy soil. Mix the Gypsum into the soil and water well.
If you are making an application of Gypsum on the soil around established plantings use it at the rate of only 40 pounds per thousand square feet. Under these circumstances the Gypsum can be spread or broadcast over the beds. And, like with the lawn, a single application should be done only once a year, over a three-year period. There is no need to mix it into the soil, simply water-it-in.The granular grade is the best, and easiest to apply, for home garden use.A single application each year is sufficient. And, it can be spread at any time of the year. Water it in right away, in order to get it working in the soil. Gypsum is neutral, non-toxic to humans and animals and does not burn.
You are welcome.
Charley
