Yellow phosphorus slag composite substrate and application thereof

The invention provides a yellow phosphorus slag compound substrate and application thereof, and belongs to the technical field of soilless culture substrates. The yellow phosphorus slag compound substrate comprises original yellow phosphorus slag, powdery yellow phosphorus slag, coco coir and ardealite. Aiming at the current situation that the original-state yellow phosphorus slag is poor in water and fertilizer retention effect, high in watering frequency and high in pH value, part of the original-state yellow phosphorus slag is crushed, and the coco coir and the ardealite are added, so that the volume weight and the field water-holding capacity of the substrate can be remarkably improved, the pH value of the yellow phosphorus slag substrate is reduced, and the water and fertilizer retention effect is improved; the growth of tomato plants and the absorption and utilization conditions and yield of nitrogen, phosphorus and potassium nutrients in the whole growth period are obviously improved. 本发明提供了一种黄磷渣复合基质及其