Yielding and seed value of winter wheat depending on valuation of water condition and tillage systems

conventional tillage crops cultivos cultivos de invierno culture d'hiver direct sowing field experimentation grain granos irrigation par aspersion labranza convencional plante de culture poland pologne polonia rendement rendimiento seed semence semillas semis direct siembra directa sprinkler irrigation statistical methods travail du sol conventionnel triticum aestivum use value valeur d'utilisation valor de uso variedades varieties winter crops yields