因子

时段

等级

轻旱

中旱

重旱

严重干旱

作物水分亏缺率CWDI(%)

全生育期

CWDI < 15

15 ≤ CWDI < 30

30 ≤ CWDI < 50

CWDI ≥ 50

播种期

CWDI < 40

40 ≤ CWDI < 50

50 ≤ CWDI < 60

CWDI ≥ 60

拔节–孕穗

CWDI < 15

15 ≤ CWDI < 45

45 ≤ CWDI < 70

CWDI ≥ 70

乳熟–成熟期

CWDI < 20

20 ≤ CWDI < 35

35 ≤ CWDI < 45

CWDI ≥ 45