After capturing Shechem, what did Abimelech sow over the demolished city?

Answer: Salt

Abimelech fought all day, captured Shechem, killed its people, demolished the city, and sowed it with salt (Judges 9:45).

“And all that day Abimelech fought against the city until he had captured it and killed its people. Then he demolished the city and sowed it with salt.”— Judges 9:45 (BSB)