Ключевые слова: adult, agriculture, agronomy, analysis, background, biology, biotechnology, caucasian, check, closeup, components, composition, contamination, ecology, environment, experiment, farming, fertile, fertilization, fertilizer, field, ground, hands, industry, lab, laboratory, male, man, mortar, natural, nitre, organic, people, person, pestle, pollution, quality, research, sample, samples, science, scientist, soil, studying, technology, test, testing, work, working, young,