One who studies bacteria and other organisms in soil for the purpose of growing crops or feeding animals.(noun)
One who studies the nutrition or breeding of animals or crops.(noun)
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Use "agrobiologist" in a sentence
"Lysenko was a poorly educated but politically savvy agrobiologist, who for decades managed to get an unconditional support from the tyrannical ruler of the USSR, first Joseph Stalin and later Nikita Khrushchev."