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Resume
Object of study is find influence predecessor on productivity and quality index wheat cultivation in period 2000-2007 year on the experimental field in Maize Research Institute – Kneja.
Analysis receiving results slow that region of North-West Bulgaria most suitable predecessor for wheat is spring peas, following from maize for grain and wheat.
Grain yield after spring peas exceed this after maize and wheat with 35,07 and 46.39%.