Coated fertilizer for inducing root growth and preparation method and application thereof

The invention discloses a coated fertilizer for inducing root growth and a preparation method and an application thereof, belonging to the field of fertilizer industry. The coated fertilizer comprises a fertilizer core and a coated layer, wherein the fertilizer core comprises organic matters, compound amino acid, humic acid materials, macroelements, secondary elements, microelements and an inorganic conditioner, the coated layer comprises a binder, a coated agent, a root system inducer, an alginate solution and a calcium ion solution. The preparation method comprises the following steps of smashing raw materials of the fertilizer core, after mixing, tabletting so as to form granulated fertilizer, spraying the binder, the coated agent mixed with the root system inducer, the alginate solution and the calcium ion solution on the granulated fertilizer sequentially so as to form a coated layer, and obtaining the coated fertilizer for inducing root growth after drying. On the one hand, the coated fertilizer can induce the root system to grow rapidly around the fertilizer due to the addition of the root system inducer, so that the fertilizer use ratio is improved; on the other hand, the fertilizer core is extruded and bonded by adopting a physical manner, so that the slow-release effect of the fertilizer core guarantees the fertilizer to be used efficiently.