ABSTRACT Research entitle the influence of concentration leaf manure organic Tress on the yield of several varieties Lec ttuce (Lactuca sativa L.), has been carried out from June 6 th 1994 until July 15 th 1994 in Tonoboyo village, Ban- dongan district, Magelang Regency, Central Java. The alti- tude was 650 meters above sea level at the latosol soil with pH 6. The research method used wa…