Disclosed are a soil replacement tray substrate for rice for raising seedlings and a method for raising seedlings thereof, belonging to the technical field of soil replacement tray substrates for raising seedlings for crops. The invention is characterized in that a pulp, an adhesive, a water-retaining agent and a fertilizer are included, with the amount of pulp being 100.0-1000.0 g/tray, the amount of adhesive being 0.1-2.0 g/tray, the amount of water-retaining agent being 2.0-20.0 g/tray, and the amount of nitrogen in the fertilizer being 0.5-5.0 g/tray, the amount of phosphorus in the fertilizer being 0.2-3.0 g/tray, and the amount of potassium in the fertilizer being 0.1-1.5 g/tray. The soil replacement tray substrate for rice for raising seedlings contains a pulp and a water-retaining agent, with the advantages of retaining water and fertility, preserving heat, good air permeability, a simple production process, and light weight of the end product, etc. The substrate is suitable for tray raising seedlings for a mechanical rice transplanter. The quality of the seedlings raised by the soil replacement substrate is superior to that of seedlings raised by traditional nutrient soil. Meanwhile, the cost of raising seedlings is significantly decreased, and the end product seedling tray is lighter so that the load and work strength of the transplanter is greatly lessened.La présente invention concerne un substrat en plaques en remplacement du sol pour le riz afin de cultiver des plants et un procédé de culture de plants associé, appartenant au champ technique des substrats en plaques en remplacement du sol pour la culture de plants. L'invention est caractérisée en ce qu'une pâte, un liant, un agent de rétention d'eau et un engrais sont inclus, la quantité de pâte allant de 100,0 à 1000,0 g/plaque, la quantité de liant allant de 0,1 à 2,0 g/plaque, la quantité d'agent de rétention d'eau allant de 2,0 à 20,0 g/plaque, et la quantité d'azote dans l'engrais allant de 0,5 à
