adapt-data-type-definitions.json: Add Biochar as a CropNutrientIngredient

[dubnemo]

Are we limited to elements on the Periodic Table?

I'd like to suggest a set of organic fertilizers, such as biochar and the classic manure.

[knelson-farmbeltnorth]

@dubnemo We brought in that list from what was in the ADAPT Framework. I can't say what it's history is, but I always understood it to be a list of discrete active ingredients in chemical fertilizers. We can revise that list just as we are doing with OperationType.

My concern would be that it represent a list of separate nutrients one would find on a chemical analysis of either organic or synthetic fertilizer. If it is a higher level concept, representing a category of fertilizer vs. chemical composition, perhaps we need a new attribute on the object.