What are the Missing Words ?

The same five letters can be anagrammed into four different words that fill in the blanks in the sentence to make good sense.
What are the missing words?

The farmer with hundreds of _ _ _ _ _ ,
deeply _ _ _ _ _ about the amount of rainfall,
and _ _ _ _ _ around with artificial watering systems
when the ground is dry enough to _ _ _ _ _ him
about the possibility of crop failure.

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Acres, Cares, Races, Scare