Figure 6

Average water content of the 0–60 cm layer of farmland soil under different treatments in 2018–2019 (a), 2019–2020 (b) and 2020–2021 (c) and precipitation and irrigation in the test area. According to the Mild stress (soil relative water content 65–70%); Moderateild stress (soil relative water content 55–65%); Severe stress (soil relative water content < 55%).