Seedling protection method for cotton field without preseeding irrigation in under-film-drip-irrigation precision-seeded cultivation environment

The invention provides a seedling protection method for a cotton field without preseeding irrigation in an under-film-drip-irrigation precision-seeded cultivation environment. The method comprises thesteps of cotton field preparation, variety and seed preparation, seeding, irrigating, seed pit sealing and other field management methods. In regions where cotton field locations are not wind valleysat both a cotton seeding period and a period of emergence, the cotton field is free of preseeding-irrigation soil moisture accumulation, an arable layer has the salt content of 0.3g/kg to 2.9g/kg andthe soil texture of loamy soil or sandy loam, chosen seeds are vitriolized bare seeds and are required to be coated, and the germination percentage should be 90.4% to 96.8%; and during the seeding ofthe cotton field, two operating procedures, i.e., cotton seeding row soil covering and tamping are not carried out, seed pits of cotton seeding rows are subjected to soil-covering pit sealing at a 1-leaf 1-heart stage of young