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The last period of the text is in the present perfect tense in which “been” is the past participle of the verb to be.
There are five occurrences of the verb to be in the text.
Agronomists need to pay attention to the growth and development of the crops.
The word “crop” is mentioned several times in the text. One of its meanings can be expressed as the produce of cultivated plants, especially cereals, vegetables, and fruit.