A method for grazing ducks and returning straw to field in soda saline-alkaline paddy fields and its application

The steps of the duck grazing and straw incorporation method include: after harvesting rice with stubbles, crushing the rice straw and spreading it into the paddy field, irrigating the field, grazing ducks until the thickness of the straw layer is reduced by ≥80% or the proportion of straw pressed into mud and covered by mud reaches ≥80%, stopping duck grazing and draining the paddy field, air-drying the field until no surface water remains, performing shallow tillage, and completing straw incorporation.

The invention utilizes the flocking behavior and feeding-trampling activities of ducks, achieving effects such as surface soil muddification, compaction of the straw layer into the mud, and natural adjustment of the carbon‑to‑nitrogen ratio through duck manure by means of high‑density grazing and block‑by‑block advancement. Shallow tillage enables complete mixing of straw into the soil without damaging the structure of the subsoil layer.