The agricultural device (10) is assembled of a storage container (12), a measuring aggregate (14) and a distributing unit (16, 28). A continuos air stream (19) is created by a fan (18). A predetermined quantity of seed or fertilizer (22) is inserted into the air stream (19) by a diffuser (21). The seed or fertilizer (22) is moved along the duct (24) to a bend (30) containing an air outlet (32) and from there to the distributing elements (28). The outlet (32) can be closed with a fine mesh, facilitating the removal of air but preventing the transported material (22) from escaping. -