Wateright Ag Tutorial - Step 3 Finding your local CIMIS station

Wateright Agricultural Tutorial

Step - 6

Generate a schedule

Submitted below is a schedule Wateright has generated for the conditions and system we have entered. The schedule is merely an estimate for run times of each irrigation, the minimum number of irrigations, and run time difference to date. Other data provided in the Wateright schedule are ETo, the crop coefficient (kc) and calculated ETc and root-zone depth. Note the changing root zone.

Wateright Schedule
Lodi, Station: 42
Nearest City: Lodi, County: San Joaquin

Field Number         : "1"
Description          : North 40
Crop                 : Corn
MAD                  : 50%
Maximun RootZone (ft): 2
Threshold (in)       : 1.222
Max Runtime (hhmm)   : 1:38
Adjustment           : 100
 
                Runtimes (HH:MM)        Current 
          Min.  Per      Weekly Runtime   Year  Avg       Avg   
Date      Freq. Start     TOTAL  Diff.  Runtime Precip.   ETo   Kc     ETc     Rz
----------------------------------------------------------------------------------
  4/1/98     0   0:00      0:00   0:00   0:00   1.22     0.77   0.20   0.15    0.3
  4/5/98     2   0:15      0:30   0:06   0:24   0.35     1.11   0.20   0.22    0.3
 4/12/98     2   0:09      0:18  -0:00   0:18   0.83     1.11   0.20   0.22    0.3
 4/19/98     0   0:00      0:00   0:00   0:00   0.04     1.19   0.20   0.24    1.0
 4/26/98     0   0:00      0:00   0:00   0:00   0.67     1.43   0.20   0.29    1.0
----------------------------------------------------------------------------------
  5/3/98     2   0:46      1:32   0:16   1:16   1.02     1.45   0.43   0.62    1.7
 5/10/98     0   0:00      0:00   0:00   0:00   0.63     1.48   0.43   0.63    1.7
 5/17/98     2   1:04      2:07  -0:04   2:12   0.00     1.34   0.71   0.95    2.0
 5/24/98     0   0:00      0:00   0:00   0:00   0.98     1.52   0.71   1.08    2.0
 5/31/98     3   1:10      3:30   0:15   3:15   0.16     1.60   0.97   1.55    2.0
----------------------------------------------------------------------------------
  6/7/98     2   1:12      2:25   0:30   1:55   0.00     1.86   0.97   1.81    2.0
 6/14/98     2   1:21      2:41  -0:19   2:60   0.00     1.75   1.15   2.02    2.0
 6/21/98     2   1:27      2:55   0:04   2:51   0.00     1.90   1.15   2.19    2.0
 6/28/98     2   1:25      2:50  -0:05   2:55   0.00     1.84   1.15   2.12    2.0
  7/5/98     2   1:28      2:56   0:06   2:50   0.00     1.91   1.15   2.20    2.0
----------------------------------------------------------------------------------
 7/12/98     2   1:21      2:42  -0:19   3:01   0.00     1.77   1.15   2.03    2.0
 7/19/98     2   1:20      2:41   0:04   2:36   0.00     1.75   1.15   2.01    2.0
 7/26/98     2   1:18      2:35  -0:12   2:47   0.00     1.69   1.15   1.94    2.0
  8/2/98     2   0:59      1:58  -0:01   1:59   0.00     1.73   0.85   1.47    2.0
  8/9/98     2   0:56      1:52  -0:08   2:00   0.00     1.64   0.85   1.40    2.0
----------------------------------------------------------------------------------
 8/16/98     0   0:00      0:00   0:00   0:00   0.00     1.52   0.52   0.79    2.0
 8/23/98     2   1:04      2:07                          1.54   0.52   0.80    2.0
 8/30/98     0   0:00      0:00                          1.67   0.00   0.00    2.0
----------------------------------------------------------------------------------
           TOTALS:        35:38   0:22                       26.7

Total Runtime (hhmm): 35:38
YTD Difference (hhmm): 0:22
Total ETc (in): 26.7
Data: 3/31/93 - 8/16/98
Records Processed: 904

Runtimes are shown in hours and minutes.
ETo and ETc are shown in inches.
Precipitation shown in inches. Significant precipitation will reduce the need to water.
If the current year ETc exceeds the 5 year historical ETc the "Runtime Difference" will show as negative(-). Negative runtime difference means that the scheduled runtime will under water the crop by the time shown.
For annual crops, the root zone is estimated to acheive full root depth after the first 30% of the crop period.
Maximum Runtime and Threshold are shown for full root depth.