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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