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Table 1 Category of drought severity per Drought Stress Index (DSI)

From: Developing drought stress index for monitoring Pinus densiflora diebacks in Korea

DSI values

DSI category

≥ 2.00

Extremely stressed

1.50 to 1.99

Very stressed

1.00 to 1.49

Moderately stressed

− 0.99 to 0.99

Near being stressed

− 1.00 to − 1.49

Moderate condition

− 1.50 to − 1.99

Good condition

≤− 2.00

Very good condition