ABSTRACT From November 20, 1990 to February 14, 1991, was carried out a research about the influence kind of plastic mulch and the intensity of tillage to the growth of weeds and yield of potato plants (Solanum tuberosum L.) in medium land. The research was done at Candiretno village, Secang sub district, Magelang regency, Central Java pro- vince, in the altitude 380 meters of the s…