A soil water budget is a good management tool for irrigation scheduling. The budget tracks your soil moisture levels with daily rainfall and irrigation volumes, the inputs and PET (potential evapotranspiration), and the outputs. The budget is in a spreadsheet which you personalise for your farm at the start of the season.
The soil moisture budget can be used as an alternative to soil moisture monitoring and is acceptable in your farm environment plan and with a number of irrigation schemes as a good management practice. However, to achieve a good grade in your audits you will need to demonstrate that the budget is up to date and that you are using it to manage your irrigation scheduling.
User guide - How to use the Soil Water Budget Spreadsheet
Click here to open the Soil Water Budget Spreadsheet template