Seedling raising method for cultivating superlong-age strong seedlings of machine transplanting rice in wheat-rice double cropping area

The invention discloses a seedling raising method for cultivating superlong-age strong seedlings of machine transplanting rice in a wheat-rice double cropping area. The seedling raising method includes variety selecting, seed processing, germination accelerating and chest bursting, seed cooling and sprout hardening, scientific fertilizer preparing for nutrient soil, sowing, seedling raising management, disease and insect damage preventing and controlling and timely machine transplanting. Compared with the prior art, the seedling raising time is 10-15 days longer, 1-2 leaves grow out in the seedling age, seedling age elasticity is improved, and the seedling transplanting stage is prolonged, which is beneficial for peasant operation and reduces intensity of the busy farming season; a late-maturing high-quality rice variety with a long growth period can be selected for a wheat and oilseed rape rice transplanting field, the transplanting variety selection is increased, seedling raising is convenient, sowing amoun