Total nutrient soilless culture matrix suitable for eggplant and preparation method and application thereof

The invention discloses a total nutrient soilless culture matrix suitable for eggplants and a preparation method and application thereof. The matrix contains an organic culture substrate, an inorganic fertilizer and a water retaining agent; wherein the organic culture substrate comprises 50-75 parts by volume of fermented cassava residue, 0-50 parts by volume of peat and 0-35 parts by volume of vermiculite; the inorganic fertilizer is composed of urea, inorganic phosphate fertilizer and inorganic potash fertilizer, and the urea is absorbed by the water retaining agent, and then is added into the organic culture substrate. By preparation of a vegetable cultivation substrate from the cassava residue as a raw material, the problem of environmental pollution caused by the waste cassava residue can be effectively solved to achieve re-use of resources. The total nutrient soilless culture matrix creatively uses the water retaining agent to absorb the urea and then adds the urea into the organic culture substrate to guarantee slow release of the absorbed N fertilizer (urea) to provide plant growth needs, also decreases N fertilizer loss, improves the utilization rate of the N fertilizer, ensures the scientific use of fertilizers, and reduces environment pollution.