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| * '''Normal ET<sub>0</sub> data''' for the season up to the current dekad. As outlined for actual data, the normal ET<sub>0</sub> data can be either calculated or entered manually. The water balance calculation needs a full year of dekadal ET<sub>0</sub> data to calculate the water balance. | * '''Normal ET<sub>0</sub> data''' for the season up to the current dekad. As outlined for actual data, the normal ET<sub>0</sub> data can be either calculated or entered manually. The water balance calculation needs a full year of dekadal ET<sub>0</sub> data to calculate the water balance. | ||
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| + | * '''General crop data'''. The crop data are described in the previous chapter. | ||
Revision as of 09:19, 1 September 2006
Entering data for a crop water balance calculation
For a water balance calculation the following data are needed:
- Actual Rainfall for the period of he water balance calculation (up to the current dekad). There are three ways to read these data into AgrometShell.
- Using the Database-Weather-Dekad function.
- When the data come as ASCII files, using the Database-Import-from ASCII file
- When the rainfall comes in the form of images, it can be imported through the Database-Import-from image function.
- Normal Rainfall for 36 dekads in the year. These data can be read into AgrometShell in the same way as actual rainfall.
- Actual ET0 data for the season up to the current dekad. The ET0 data can be calculated from its base data (temperatures, windpeed etc.. ) using the Database-Calculate-Formula function or the Tools-Potential ET-from file function. In case the ET0 values are already calculated, the can be entered in the three ways mentioned above. Although actual ET0 data will improve the outcome of the water balance calculation, AgrometShell can use normal values instead.
- Normal ET0 data for the season up to the current dekad. As outlined for actual data, the normal ET0 data can be either calculated or entered manually. The water balance calculation needs a full year of dekadal ET0 data to calculate the water balance.
- General crop data. The crop data are described in the previous chapter.