Effects of Adding Chemical Fertilizer and Plastic Films to Raise Soil Temperature on the Elimination of Radopholus similis in Soil

【Objective】The eliminating effect of chemical fertilizer and sunlight on Radopholus similis in soil were studied.【Method】The experiment was conducted by adding chemical fertilizer to the soil infected with R. similis and covering it with plastic films.【Result】The results showed that the soil temperature was raised by adding calcium cyanamide or carbamide and covering the soil with white or black films. In the case that the highest average temperature in the local area was above 38.8 ℃ , and the number of sunny days was above 31 days, the R. similis in soil could be eliminated effectively by the method(adding calcium cyanamide or carbamide and covering soil with films) treating soil for no less than 5 weeks; in the case that the highest average temperature in the local area was above 37.6 ℃ , and the number of sunny days was above 38 days, the R. similis in soil could also be eliminated by the method(adding calcium cyanamide or carbamide and covering soil with films) treating soil for no less than 6 weeks. Among all the treatments, 1 L soil treated with 10 g calcium cyanamide and covered with white films had the best effect on increasing soil temperature.【Conclusion】In high temperature seasons, the method of adding calcium cyanamide or carbamide and covering white or black films can eliminate the R. similis in infected soil.