Soil organic carbon content of paddy fields before transplanting and after harvesting FF: Flooding irrigation and farmers’ fertilization practice, FS: Flooding irrigation and wheat straw return at a rate of 3000 kg ha^-1, CF: Controlled irrigation and farmers’ fertilization practice, CS: Controlled irrigation and wheat straw return at a rate of 3000 kg ha^-1, BV: Background value.

<p>Soil organic carbon content of paddy fields before transplanting and after harvesting FF: Flooding irrigation and farmers’ fertilization practice, FS: Flooding irrigation and wheat straw return at a rate of 3000 kg ha^-1, CF: Controlled irrigation and farmers’ fertilization practice, CS: Controlled irrigation and wheat straw return at a rate of 3000 kg ha^-1, BV: Background value.</p>