In comparison with the WW treatment, under the MD and SD treatments the volumes of root exudates at 14 DPA decreased by respectively 27.0% and 66.1% for the WT, by 21.5% and 56.9% for PPDK, and by 6.3% and 50.7% for PCK and the volume of root exudates at 28 DPA decreased by respectively 42.1% and 71.4% for the WT, by 33.7% and 66.3% for PPDK, and by 20.7% and 63.6% for PCK.