Impact of Anaerobic Soil Disinfestation Treatment on the Properties of Tomato Continuous Cropping Soil

To investigate the impact of anaerobic soil disinfestation (ASD) treatment with different processing duration on tomato continuous cropping soil, a total of eight treatments were designed, which included two treatment temperatures of 10 °C and 30 °C, and four treatment times of 3, 4, 5 and 7 weeks (w). The results showed that whether the temperature was 10 °C or 30 °C, the pH values, TOC and available K contents in the soil treated by the ASD method were significantly increased (P<0.05), while the EC values and NO3 – contents in soils treated by ASD were significantly reduced compared with the untreated group (P<0.05). The Fusarium oxysporum population in soils treated by ASD decreased with the extension of the treatment time. When the treatment temperature was 30 °C, the effect on the removal of the NO3 – that had accumulated in soils treated by ASD was significantly better than the treatment temperature of 10 °C (P<0.05). When soil was treated by ASD for more than 5 w at 30 °C, the NH4 + content in soil was significantly increased (P<0.05) compared with the untreated soil. In conclusion, NO3 – accumulation in soils could not be completely eliminated with treatment by ASD, even when the treatment time at 10 °C was prolonged. Whether the treatment temperature was 10 °C or 30 °C, the F. oxysporum population in soils treated by ASD decreased significantly with the extension of the treatment time to more than 5 w compared with treatment only for only 3 w.