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2007 Nebraska Water Management Demonstration Network ET Gage Data

NOTE:  The glass tube on the atmometer at Site #8 was damaged and data from the site is unavailable at this time.  The gauge will be replaced and readings will resume next week.  Weekly crop water use for the site is being estimated at 1.15 inches.

Site #8
Arapahoe 8 mi. Northwest - SE1/4 Section 12 -T5N-R24W, Gosper County
Date read
6/2
6/9
6/17
6/24
6/30
7/6
7/14
7/21
7/29
8/4
8/11
8/18
8/26
9/1
9/8
9/15
9/22
9/29
ET gage change for period
Date
1.30
2.00
1.50
1.75
1.75
2.15
2.10
1.60
2.30
1.00
1.15
n/a
            
Rainfall for period
  
0.71
0.32
0.79
0.91
0.10
0.24
0.41
0.32
0.08
0.36
0.90
0.88
            
Corn
Crop ET
Factor
Weekly Crop Water Use for Corn by Stage of Growth
V2 - 2 leaf
0.10
0.13
                                  
V4 - 4 leaf
0.18
0.23
0.36
                             
V5 - 6 leaf
0.35
0.46
0.70
0.53
0.61
                            
V8 - 8 leaf
0.51
0.66
1.02
0.77
0.89
0.89
                          
V10 - 10 leaf
0.69
 
1.38
1.04
1.21
1.21
1.48
                        
V12 - 12 leaf
0.88
      
1.54
1.54
1.89
1.85
                   
V14 - 14 leaf
1.01
        
1.77
2.17
2.12
1.62
                   
V16 - 16 leaf
1.10
          
2.37
2.31
1.10
2.53
1.10
                
R1 - silk
1.10
          
2.37
2.31
1.76
2.53
1.10
1.27
1.15
            
Blister
1.10
          
2.31
1.76
2.53
1.10
1.27
1.15
            
Dough
1.10
                
2.53
1.10
1.27
1.15
            
Beg. dent
1.10
                    
1.27
1.15
            
Black layer
0.60
                                    
 = Observed stage of growth at site; use ET rate corresponding to crop maturity in field
Date read
6/2
6/9
6/17
6/24
6/30
7/6
7/14
7/21
7/29
8/4
8/11
8/18
8/26
9/1
9/8
9/15
9/22
9/29
ET gage change for period
Date
1.30
2.00
1.50
1.75
1.75
2.15
2.10
1.60
2.30
1.00
1.15
n/a
            
Rainfall for period
  
0.71
0.32
0.79
0.91
0.10
0.24
0.41
0.32
0.08
0.36
0.90
0.88
            
Soybeans
Crop ET
Factor
Weekly Crop Water Use for Soybeans by Stage of Growth
VC - cotyledons
0.10
0.13
0.20
0.15
0.18
                            
V1 - 1st node
0.20
0.26
0.40
0.30
0.35
0.35
                          
V2 - 2nd node
0.40
0.52
0.80
0.60
0.70
0.70
0.86
                        
V3 - 3rd node
0.60
  
1.20
0.90
1.05
1.05
1.29
1.26
0.96
1.38
                  
R1 - beg. bloom
0.90
        
1.58
1.94
1.89
1.44
2.07
                 
R2 - full bloom
1.10
          
2.37
2.31
1.76
2.53
1.10
1.27
              
R3 - beg. pod elongation
1.10
            
2.31
1.76
2.53
1.10
1.27
1.15
            
R4 - end pod elongation
1.10
                  
1.10
1.27
1.15
            
R5 - beg. seed enlargement
1.10
                  
1.10
1.27
1.15
            
R6 - end seed enlargement
1.10
                      
1.15
            
R7 - beg. maturity
0.90
                                    
R8 - mature
0.00
                                    


The Central Nebraska Public Power and Irrigation District
415 Lincoln Street , P.O. Box 740
Holdrege, Nebraska 68949
Phone 308-995-8601
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(Updated 8/26/08 )

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