Gypsum increases the number of large soil pores by improving soil structure ( Miller, 1987). Moreover, soil infiltration is directly related to the diameter of soil pores. Consequently, soil infiltration will improve by increasing its gypsum content. Improved soil infiltration increases the amount of water entering it and being stored in it. This stored moisture makes crop plants more resistant when water becomes scarce and increases their yield. Research has shown that water from rainfall that is stored in soil increases crop yield even in irrigated lands.