Slow-release compound fertilizer particle for saline-alkali soil improvement and preparation method thereof

The invention provides slow-release compound fertilizer particles for saline-alkali soil improvement and a preparation method of the slow-release compound fertilizer particles, and belongs to the technical field of saline-alkali soil improvement. According to a large number of experiments in the early stage, the specific processing technology that materials with vinegar residues, wood vinegar, calcium citrate and ardealite as substrates are combined with compost fermentation and secondary fermentation of a bacillus licheniformis-bacillus velezensis compound fungicide is found; the obtained slow-release compound fertilizer particles can solve the problem of poor saline-alkali soil improvement fertilizer in the prior art. The fertilizer provided by the invention can simultaneously retain nutritional ingredients in the raw materials and a saline-alkali remediation function, and can stably exert effects for a long time by doping subsequent slow-release components, so that crops are prevented from being damaged by