[Report on a trip to Northern Germany and the Netherlands to study small fruit growing]

abri plastique baja sajonia basse saxe beerenobst blackberries cultivation cultivo ferme pilote fincas experimentales fraise framboise frambuesa fresa fruit harvesters groseille rouge grosella roja lower saxony market gardens multiplication des plantes pilot farms plant propagation plastic film covers pratique culturale raspberries red currants strawberries zarzamora