The Impact of Vermicompost and NPK Fertilisation on the Growth and Bulb Yield of Shallots (Allium Ascalonicum L.) in Rote Ndao Regency

This study examines the effects of vermicompost and NPK fertiliser, both individually and in combination, on the growth and bulb yield of shallots (Allium ascalonicum L.) in Rote Ndao Regency, Indonesia. A factorial randomised block design was employed, consisting of 16 treatment combinations replicated three times in field trials. Key growth parameters assessed included plant height, leaf length, number of leaves, as well as fresh and dry bulb weights. In addition, soil chemical properties were analysed before and after treatment application. The results demonstrated a significant synergistic interaction between vermicompost and NPK fertiliser, leading to enhanced plant growth and yield. The K3N3 treatment (15,000 kg/ha vermicompost + 750 kg/ha NPK) produced the highest fresh and dry bulb weights, whereas the K1N3 treatment (5,000 kg/ha vermicompost + 750 kg/ha NPK) resulted in the tallest plants. Soil analyses revealed improvements in pH, organic carbon, total nitrogen, available phosphorus, and potassium levels, indicating enhanced soil fertility. These findings underscore the effectiveness of integrated nutrient management as a sustainable strategy to improve shallot productivity while maintaining soil health in dryland agricultural systems.