What are the precautions for cultivating flowers with biogas slurry

When cultivating flowers with biogas slurry, although the fertilizer effect is steady, the nutrients are complete, the fertilizing power is long-lasting, and it also controls pests and diseases, the following precautions should be noted:

(1) The biogas residue must be fully decomposed; the removed biogas residue can be stored in a bucket for 20-30 days before use.

(2) Before biogas slurry is used as a topdressing or foliar spray fertilizer, it should be left open for 2-3 hours.

(3) When using biogas slurry for potted flowers, the amount should be calculated; do not be impatient and over-fertilize. If old leaves fall in profusion after fertilizing, the concentration is too high, and it should be diluted with water or the soil should be changed promptly; if the edges of young leaves become water-soaked and drop off, it is water-fertilizer poisoning, and the plant should immediately be removed from the pot and repotted, pruned, and cared for in the shade.