Final answer:
The top states for alfalfa production in 2007 were California, North Dakota, and Idaho, largely due to alfalfa's drought tolerance and deep root system, as well as its role in supporting the dairy industry which is often located near population centers. Changes in crop profitability can affect agricultural trends.
Step-by-step explanation:
The top three states for alfalfa production in 2007 were California, North Dakota, and Idaho. Alfalfa (Medicago sativa), a perennial herbaceous crop, originated in the Middle East and has been cultivated for over 2500 years. It is largely used as forage for domesticated animals, particularly in the form of hay, and is known for its deep root system and drought tolerance, enabling it to thrive in dry environments. It also has the capability to produce chemicals that prevent the germination of its own seeds, leading to the necessity for crop rotation. This adaptability to dry conditions contributes to its extensive cultivation in western areas of the US, like California.
Since alfalfa is a supportive crop for the dairy industry, requiring proximity to dairy farms which are typically located near population centers for logistical reasons, its production is influenced by the distribution of dairy farms. States like California lead in both the dairy industry and alfalfa production. The economic viability and profitability per acre of different crops can shape the agricultural landscape, as seen in regions like Illinois, which focus on corn rather than cattle due to the higher profitability of grain crops. These agricultural trends are subject to change in response to shifts in market demand and relative crop prices over time, emphasizing the dynamism of agricultural economics.