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Table 4 Water stress amounts and periods for the LIRF 2008–2011 water productivity study

From: Water productivity of maize in the US high plains

Year Treatment Seasonal Stress Moderate stress growth stages Severe stress growth stages
2008 T1 1.00   
  T2 1.00   
  T3 0.98   
  T4 0.95   
  T5 0.84 V10–V16, R4 R5–R6
  T6 0.84 V10–V16, R4 R5–R5
2009 T1 1.00   
  T2 1.00   
  T3 0.99   
  T4 0.94 V11–V12  
  T5 0.77 V10–VT, R1–R2 R3–R6
  T6 0.70 V10–VT, R1–R2 V11–V12, R3–R6
2010 T1 0.79   R5–R6
  T2 0.77 V17–VT, R4 R5–R6
  T3 0.71 V17–VT, R4 R5–R6
  T4 0.70 V11–VT R4–R6
  T5 0.57 V8–V10 V11–VT, R3–R6
  T6 0.54 V8–V14 V14–VT, R3–R6
2011 T1 1.00   
  T2 1.00   
  T3 0.85 R3–R6  
  T4 0.83 V15–VT, R3–R6  
  T5 0.82 V10–V16, R1–R4 R5–R6
  T6 0.77 V12–VT, R2–R3 R4–R6
  1. Ks is a stress coefficient based on soil water deficit as defined by Eq. 3. Seasonal stress is the average of daily Ks over approximately 130 days between maize emergence and maturity (1.0 = no stress). Moderate stress growth stages are the growth stages during which 0.75 > Ks > 0.5 for most days. Severe stress growth stages are the growth stages in which Ks < 0.5 for most days