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Table 2

Evaluation index of dried soil layers in the Loess Plateau

Deficit conditionVolume soil water content (%)Water deficit degree (%)
Minor water deficit >75θ<25 
Moderately light water deficit 70θa–75θ25– < 30 
Moderate water deficit 55θa– < 70θ30– < 45 
Moderately heavy water deficit 50θa– < 55θ45–50 
Severe water deficit <50θ>50 
Deficit conditionVolume soil water content (%)Water deficit degree (%)
Minor water deficit >75θ<25 
Moderately light water deficit 70θa–75θ25– < 30 
Moderate water deficit 55θa– < 70θ30– < 45 
Moderately heavy water deficit 50θa– < 55θ45–50 
Severe water deficit <50θ>50 

a) θa is critical moisture for growth and equals 60% of the field water capacity.

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