Application of ardealite in preparation of plant culture medium

The invention belongs to the field of ardealite utilization, and particularly relates to application of ardealite in preparation of a plant culture medium. The phosphogypsum is modified by changing the using amount of lime and the aging time so as to remove the phosphorus content and the fluorine content of the phosphogypsum, a lime neutralization method is adopted, and when the using amount of the lime is 0.4% and the aging time is 12 h, the removal rates of soluble phosphorus and soluble fluorine in the phosphogypsum are the highest and are 93.27% and 29.07% respectively. The phosphogypsum obtained through modification treatment, yellow soil, lime and humus are used as raw materials to prepare compound matrixes with different proportions for plant cultivation, and the influence of the matrixes with different proportions on plant growth is researched; finally, the optimal treatment mode and proportion of the ardealite for preparing the culture medium for eggplants, rhododendron, daphne odora, geranium, rhodo