Method for dissociating contribution rates of irrigation, drainage and fertilization to soil salt migration

The invention discloses a method for dissociating the contribution rate of irrigation, drainage and fertilization to soil salinity migration, which comprises the following steps: 1) establishment of test fields: establishing forty-two test fields, one half of which is a flat water test field and the other half of which is a drought test field, and numbering each test field; 2) water source selection: establishing well water, river water and sewage; 3) fertilizer selection: preparing organic fertilizer and inorganic fertilizer with the same parts; 4) selecting a soil salinity migration method: irrigating the test field, and performing a salinity migration method of irrigating and fertilizing, and irrigating, fertilizing and draining; and 5) sampling: performing an experiment on the test field after salt migration, performing an experiment on an improvement effect through an experiment method of irrigation, irrigation + fertilization and irrigation + fertilization + drainage in the same test field, and selectin