ABSTRACT A reseach about the effect of age of seedling and dose of urea fertilizer on the yield lettuce (Lactuca sativa, L.) had been carried out since October 135 2000 until January 5'? 2001 at Green house, Faculty of Agriculture, University of Tidar Magelang, Potrobangsan Village, North Magelang District, Magelang Regency. The soil type is latosol with pH 6,5 and altitude is 376 m…