Agriculture can be conceptualized as the “controlled cultivation of biomass.” This represents a useful definition in geography and agricultural studies.
Interpretation
Agriculture involves the deliberate manipulation and handling of living beings including plants and animals with the view to producing useful products.
From this perspective:
Natural ecosystem → Human intervention → Cultivation/animal husbandry → Biomass production → Food, fiber, fuel and other products
Why agriculture is called controlled cultivation of biomass
Farmers have control over various factors:
Land/soil – preparation and management of the soil
Water – irrigation and drainage
Seeds and crops – selection and breeding
Fertilizers and manure – use of fertilizers and manure
Pests and diseases – control of pests
Temperature and microclimate – use of controlled agriculture methods
Reproduction and feeding of animals – animal husbandry
Harvesting – collection of biomass
Thus, agriculture is different from mere natural collection of biomass since humans select, handle, and harvest living beings intentionally.

Link(s), Source(s),Inspiration(s) and Further Reading:

Origin of Agriculture

Farming Started in Several Places at Once: Origins of Agriculture in the Fertile Crescent

Agriculture Started in West Asia 23,000 Years Ago?


Growing urban agriculture beyond the city limit

Issues,Priorities and Challenges for Indian Agriculture:A Worldbank View

Five Early Urban Hearths

Meghalayan Age, the Latest Stage in Earth’s 4.54-Billion-Year History Began 4,200 Years Ago When a Global Mega-drought devastated Agricultural Societies

Now,Agricultural Field Will SMS When to Water It


Farming Systems:Indian Scenario