4.21 - Modified Hargreaves Crop Coefficient File (*.kmh)
The crop coefficient file (*.kmh) contains Modified Hargreaves crop coefficient curves developed by Agro
Engineering, Inc. This file is read when flag1= 4 in the model control file (see Section 4.4).
The recommended naming convention to identify crops with their crop coefficients is Crop_Name.XXX as
described in Section 3.1.7. An example is provided in Appendix A.
| Row-Data | Program Variable | Description |
|---|---|---|
| Row 1 | Format (a80) | |
| 1-1 | remark | Title |
| Row 2-4 | Free Format | |
| 2-1 | nc | Number of crop coefficient curves |
| 3-1 | id | Crop number (not used in StateCU) |
| 3-2 | cropn | Crop name |
| 4-1 | kcday(1) | Number of days to 10 percent cover |
| 5-1 | kcday(2) | Number of days to 80 percent cover |
| 6-1 | kcday(3) | Number of days to crop maturity |
| 7-1 | kcday(4) | Number of days to crop harvest |
| 8-1 | kcb(1) | Crop coefficient K1 |
| 9-1 | kcb(2) | Crop coefficient K2 |
| 10-1 | kcb(3) | Crop coefficient K3 |
Repeat for the number of crop coefficient curves, nc.
Note that additional information is required for alfalfa.
If the crop is alfalfa (cropn= ALFALFA.MHG), then the following format applies for rows 3 through 12:
| Row-Data | Program Variable | Description |
|---|---|---|
| Row 3-12 | Free Format | |
| 3-1 | id | Crop number (not used in StateCU) |
| 3-2 | cropn | 'ALFALFA.MHG' |
| 4-1 | kcday(1) | Number of days to 10 percent cover |
| 5-1 | kcday(2) | Number of days to 80 percent cover |
| 6-1 | kcday(3) | Number of days to first cut |
| 7-1 | kcday(4) | Number of days to crop maturity |
| 8-1 | kcday(5) | Number of days to second cut |
| 9-1 | kcday(6) | Number of days to crop harvest |
| 10-1 | kcb(1) | Crop coefficient K1 |
| 11-1 | kcb(2) | Crop coefficient K2 |
| 12-1 | kcb(3) | Crop coefficient K3 |