级别

X_i值

抗旱性

1

X_i ≥ 0.8

高抗(highly resistant, HR)

2

0.6 ≤ X_i < 0.8

抗(resistant, R)

3

0.4 ≤X_i < 0.6

中抗(modeately resistant, MR)

4

0.2 ≤ X_i < 0.4

敏感(susceptible, S)

5

X_i < 0.2

极敏感(highly susceptible, HS)