Earlier versions of Field Track employed a 'projection' system for a field's main income. It assumed that your currently calculated sales price was the same for the whole field's yield.
The latest version of Field Track does things differently, so income appears to go 'up' the more you sell and should be a little more understandable, however it no longer (currently) takes account of a field's yield variations. This may be altered in later version upgrades.
Each field can be given a "Sales Crop Type". As you sell a "Sales Crop" then each field with the same 'type' will have its main income altered.
The main income list is NOT field specific and simply details all shipments of that specific "Sales Crop Type" sold.
The Main Income system can use one of two types of calculations: Area Based (default), or "Area Based. You can access Field Track's configuration system to switch either system on, or off:
Area Based is the default, however, the principle behind the calculation is the same.
As you sell a main income crop type, Field Track totals up the field areas for all fields with the same "Sales Crop Type" and then deduces how much this field is as a percentage of the total area. The field is then given an income of that percentage of the total income from that "Sales Crop Type". For example you sell £100 worth of grain and two fields of 50 acres each are allocated to your sales crop type. Field Track will deduce each field is 50% of the total sales and will give each field £50 worth of the total sales. A very basic example but that's how it works.
The "Area Total" of any "Sales Crop Type" is not stored by Field Track. You can click on the underlined "Area Total" to see what the total area is of the current sales crop.
Total income is based on "Price/Unit" multiplied by "Units Sold".
Due to the way Main Income is calculated the figures are NOT altered when you upgrade from earlier versions of Field Track. You will need to re-select a "Sales Crop Type" in every field to have Field Track re-calculate your main income to the new system. It is not required that old records be altered however, if you are happy with them.