Applying the SIPOC concept to, "Types of work related to agriculture" ... plants and animals have different considerations that I'm not attempting to address.
SUPPLIERS: real estate agents, Department of Agriculture, seeds and fertilizer vendors, tractor/farm equipment rental or sales, OSHA
INPUTS: land/real estate sales or leasing, land management requirements, water management, seed and fertilizer, employees
PROCESS: storing materials, growing food, harvesting, processing food for purchase
OUTPUTS: packaged/prepared food, compost, waste products
CUSTOMERS: farmers markets, local markets, food distribution, waste management companies
That is a start
Drew recommends the following next steps: