In a practice known as crop rotation, farmers alternate a crop of legumes (plants, like beans, whose roots bea

In a practice known as crop rotation, farmers alternate a crop of legumes (plants, like beans, whose roots bear nodules containing Rhizobium) with a crop of nonlegumes. What is the benefit of this practice?



A) Rhizobium fixes nitrogen, and excess products of this process can fertilize the soil.
B) It prevents the farmer from being personally exposed to the same crop pathogens year after year.
C) It keeps the plants from getting too used to the bacteria in a particular variety of soil.
D) It keeps the plants from becoming pesticide resistant.
E) It keeps those bacteria that are plant pathogens from becoming pesticide resistant.

A - the nitrogen stuff. We do this for our tomato plants - rotate bean crop in one bed, then that's the tomato bed next year since tomatoes are "heavy feeders" who suck up lots of nitrogen from the soil.

A