Content description for the individual items of a resource string array

Question

I have a spinner which is filled with the following string array from resources.

<string-array name="units_array_area">
    <item>kg/hectare</item>
    <item>kg/acre</item>
    <item>lb/hectare</item>
    <item>lb/acre</item>
</string-array>

Now if the selected item is kg/hectare, TalkBack pronounces it as "kug slash hectare", which doesn't make any sense. How can I make it pronounce "kilograms per hectare" while still displaying kg/hectare?