The energy balance of the production process of seed potatoes

analisis analyse analyse input output analysis anatomia anatomie anatomy bilan d'energie condiciones ambientales condition de milieu crops cultivos economic analysis economic plants energy balance environment environmental conditions environnement hortalizas (plantas) insolation medio ambiente methode methods papa plant anatomy plantas plantas feculentas plante plante de culture plante racine plants pomme de terre potatoes propagation materials root crops root vegetables starch crops stems storage organs tallo tige tubercule tubers vegetable crops