highly significantP < 0.01
For the total length of the root system, the treatment with −0.14 MPa had the longest root length, which was 92.36 cm, showing a highly significant level of 39.7 cm longer than CK ( P < 0.01); With the decrease of environmental water potential, the total root length showed a very significant decrease trend ( P < 0.01), with the lowest being −1.02 MPa treatment, resulting in a total root length of 5.37 cm ( Fig. 2E ).