[Handbook on seed production: results from 30 years of experimentation]

cosecha crecimiento croissance crops cultivation cultivo cultivos danemark denmark dinamarca drying enfermedades de las plantas establecimiento de plantas fertilisation fertilizer application field experimentation gramineas graminee grasses growth harvesting maladie des plantes plant diseases plant establishment plant protection plante de culture pratique culturale production de semences profondeur de semis profundidad de siembra protection des plantes secado seed production sowing depth trifolium repens