Effect of sowing date and component participation in mixture of barley and wheat on yield components and protein content in grain

analytical methods caracteres de rendimiento composante de rendement contenido proteico cultivos de primavera culture de printemps date de semis energy value fecha de siembra field experimentation grain granos hordeum vulgare mezcla de semillas poland pologne polonia protein content rendement rendimiento seed mixtures sowing date spring crops statistical methods technique analytique triticum aestivum yield components yields