Think about how many people used to be farmers. In 1900, nearly 40% of our population were farmers. In 1950s, it was 12.2% and each farmer supplied food for 15.5 persons. Now it is 2% directly involved in agriculture, yet the value of their production has skyrocketed and we export tons of products to other nations.

They use technology and better inputs and tools. Agronomists are used who specialize in things that the average farmer didn't understand, and feed specialists, and then obviously there are those who design and manufacture their equipment. Many farmers are retiring and people are managing much larger plots with fewer people but more machines. It's not like there are many unemployed farmers you hear about, their kids are in school either learning about how to make Deeres or Cases, or studying for professions and moving to cities.
Just because the amount of people directly doing something is lower doesn't mean that things are worse off... it just requires people to take up work in areas that supplement or enable progress to occur. (In manufacturing, CNC programming, CAM or CAD training, logistics, lean six-sigma quality specialist, design for manufacturing engineer, etc. etc.)

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