Planting method for improving yield of silage corn in coastal mud flat area

The invention discloses a planting method for increasing the yield of silage corn in a coastal mud flat area, which comprises the following steps: alfalfa is planted in saline-alkali soil in a coastal mud flat reclamation area in October every year, the alfalfa is planted by sowing in drill in large and small rows, the row spacing of the small rows of the alfalfa is 30cm, the row spacing of the large rows of the alfalfa is 60cm, and the row spacing of the small rows of the alfalfa is 30cm; the small rows and the large rows of medicago sativa are alternately arranged; cutting and harvesting the medicago sativa for ensiling in May of the next year, wherein 5-10cm crops for rotation are reserved in the medicago sativa; after the medicago sativa is cut and harvested, silage spring corn is sown between the small rows of the medicago sativa, and the row spacing of the silage spring corn is 90 cm; harvesting silage of the silage spring corn in August. The problem that the silage yield of dry crop corn planted in coa