The research about "The Effect of Sitozym and Plant Spacing on Potato (Solanum tuberosum L.) Yield" was conducted at Bawono Village, Pakis Subdistrict, Magelang Regent, Central Java Province. This research had been conducted on February until June, 1988. The method of research is Split Plot Desaign (SPD) based on Randomized Complete Block Design (RCDB), with two factors an three replications. T…