Pengaruh Komposisi Media Tanam dan Pupuk Organik Cair Daun Lamtoro terhadap Pertumbuhan Bibit Kopi Arabika (Coffea arabica L.) Varietas Sigarar Utang

Abstract

The decline in coffee productivity in Indonesia is partly due to low seedling quality. Planting media and fertilizers play an important role in the seedling stage. Goat Manure can improve soil fertility, while lamtoro leaf liquid organic fertilizer contains nitrogen that supports vegetative growth. This study aims to assess the effect of planting media and lamtoro leaf POC on the germination and growth of Arabica coffee seedlings of Sigarar Utang variety. This research was conducted at the experimental field of the Faculty of Agriculture, University of North Sumatra, with coordinates 3°33'24.9°N and 98°39'16.9°E, at an altitude of ±25 meters above sea level. This research was conducted from February to June 2025. This study used a factorial randomized design consisting of 2 treatment factors and 3 replications. The first factor is the composition of planting media, soil: Rice Husk: Goat Manure (4:1:1), Soil: Rice Husk: Goat Manure (1:4:1), Soil: Rice Husk: Goat Manure (1:1:4) and the second factor is lamtoro POC concentration (0 ml, 25 ml, 50 ml, 75 ml). The results showed that the planting media had a significant effect on plant height, chlorophyll index, and crown fresh weight. In contrast, lamtoro leaf POC and its interaction with the growing media had no significant effect, possibly due to the low nutrient content. Media dominated by Goat Manure proved to be more effective in supporting the early growth of Arabica coffee seedlings.