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Considerable increasing number of plant varieties on domestic seed market at lower production and selling of planting material in years 1989-2001 was observed; thus the exchange of cereal seeds could have place every 14 years and seed potato every 35 years only. Unachieved varietal potential increased from 33,0-51,0% in years 1986-1996 to 48,9-60,9% in years 2000-2002, owing to increased yields in...
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