The effect of stepwise seeding in the summer period on the development of the bracteate poppy (Papaver bracteatum) and on the quality and yield of the drug

calidad cantidad de semilla requerida date de semis essai etapas de desarrollo de la planta fecha de siembra graine measurement mesure opio opium papaver somniferum plant developmental stages precipitation pruebas quality racine rendement rendimiento roots saison seasons seeding rates seeds semilla sowing date trials yields