Application of agricultural gypsum in saffron fields
Investigation of the mechanism of agricultural gypsum in reducing the soil salinity of saffron fields shows that there is no time limit for adding gypsum to the soil and it can be done at any time. We should also add gypsum to the soil when heavy irrigation is possible. If the addition of gypsum to the soil is not followed by heavy irrigation, the washed gypsum will accumulate in the upper depths of the soil (area of root activity). Accumulation of gypsum in the upper layers acts as a limiting layer if it exceeds 40%. In cases where the gypsum accumulates in the depth of the saffron root area, the saffron root changes its direction one to two centimeters from this layer. This is why gypsum needs to be added gradually over two to three years in order to improve the salinity of farm soils.
Agricultural gypsum contains the two widely used elements of calcium and sulfur. Due to the presence of sulfur in water and soil sources, calcium supply is more important, because its deficiency in the soil causes physiological problems of absorption and transfer in the plant and disturbs the balance between calcium and magnesium in favor of magnesium. Therefore, it is recommended to use this substance gradually over two to three years.