Growth and Production Response of Lettuce (Lactuca Sativa, L) Due to GDM Liquid Organic Fertilizer and NPK Mutiara Concentration

Abstract: The research was conducted in July-August 2024, located in Gurgur Pematangsintar, Siantar Simarimbun District with an altitude of 390 meters above sea level. The purpose of the research was to determine the response of growth and production of lettuce (Lactuca sativa L.) due to the concentration of GDM liquid organic fertilizer (LOF) and NPK Mutiara. The study used a factorial Randomized Block Design (RBD) with two factors. The first factor was the administration of the GDM LOF dose (G) consisting of 4 levels, namely G0 = Control, G1 = 10cc/plot, G2 = 20cc/plot and G3 = 30cc/plot. The second factor was Mutiara NPK (N) consisting of 4 levels N0 = Control, N1 = 100g/plot, N2 = 200g/plot and N3 = 300g/plot. The parameters observed were plant height (cm), number of leaves (strands), net weight per plant (g) and net weight per plot (kg). The results showed that the GDM LOF and NPK Mutiara fertilizer treatments significantly affected plant height, leaf number, net weight per sample, and net weight per plot. GDM LOF treatment at a dose of 30cc/plot was the best dose, and NPK Mutiara treatment at 300g/plot was the best. However, the interaction between GDM LOF and NPK fertilizer showed no significant effect on plant height, leaf number, net weight per sample, or net weight per plot.