00541naa#a2200169#i#450# EN\\bibl\11023 20260313230514.5 1997-3225 20160318b2016####ek#y0engy0150####ca RUS RU SPRING WHEAT CLOGGING BY CONVOLVULUS ARVENSIS INFLUENCE FOR PRODUCTIVITY INDICATORS IN FOREST-STEPPE OF SAMARA REGION Journal article Kinel Samara State Agrarian University 2016 2 с. Journal article local Sharapov Ivan Ivanovich zh-szf.ru