Seed time, seed rate and nitrogen fertilization in different varieties of winter wheat [take-all]

azote cantidad de semilla requerida crecimiento croissance crop yield cultivos de invierno culture d'hiver danemark date de semis denmark dinamarca encamado fecha de siembra fertilisation fertilizer application gaeumannomyces graminis growth lodging nitrogen pseudocercosporella rendement des cultures rendimiento de cultivos sowing date sowing rates triticum variedades varieties verse winter crops