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бессменная культура stresses
agr.	continuous cultivation
agric.	continuous culture
agrochem.	permanent system
econ.	continuous cropping
Makarov.	continuous crop; monocrop; monoculture; one-species culture; permanent crop
бессменные культуры
ecol.	permanent crops

бессменная культура: 2 phrases in 2 subjects

Agriculture	1
Makarov	1