Slow-release rooting agent and preparation method thereof

The invention relates to a slow-release rooting agent and a preparation method thereof. The slow-release rooting agent is a pasty colloid obtained by mixing a slow-release agent, a reinforcing agent, a rooting agent and a solvent. The slow-release rooting agent comprises effective compositions in parts by weight: 1000 parts of bentonite, 24-36 parts of aluminum sulfate, 1.8-3.6 parts of a green plant growth regulating agent, 1.8-3.6 parts of indole-3-butyric acid potassium, and the balance purified water. The compositions interact each other for preparing the gray pasty colloid which has protrude rooting promotion effect; also the characteristics and the performances of the compositions are fully utilized, and the proportion and the usage amount are reasonable; the slow-releasing rooting agent is closely combined with production practice, the usage method is simple and practicable, the raw materials are cheap and easily purchased, the slow-release rooting agent is wide in application scope and extremely strong in practicability, and has relatively high popularization utilization value.