This photo from a 1921 encyclopedia shows a
tractor ploughing an
alfalfa field.
Infrared
image of the above farms. To the untrained eye, this image appears a
hodge-podge of colours without any apparent purpose. But farmers are now
trained to see yellows where crops are infested, shades of red
indicating crop health, black where flooding occurs, and brown where
unwanted pesticides land on chemical-free crops.
[citation needed]
After 1492, a
global exchange of previously local crops and livestock breeds occurred. Key crops involved in this exchange included the
No comments:
Post a Comment