V3I3P91

The Efficacy of Organic and Inorganic Fertilizers on the Growth Performance of Onion (Allium cepa L.): A Comparative Study

Seth Assur G. Alampayan¹, Carlo Jay A. Enovero¹, Roliie, Jr. M. Batula¹, Angelo P. Salar¹, Christine D. Agbo¹, Mares P. Daug¹, Rodelio B. Pasion, PhD^1*

Abstract

This study investigated the effects of organic and inorganic fertilizers on the growth performance of onion (Allium cepa L.) using a quantitative experimental research design. The experiment was conducted in Butuan City, Agusan del Norte, where onion seedlings were subjected to three treatments: organic fertilizer (goat and horse manure), inorganic fertilizer, and a control group. Growth performance was measured using key indicators, including leaf length, number of leaves, root length, and number of roots. Results showed that all treatments supported plant growth; however, the organic fertilizer consistently produced the highest values across all parameters. By the final observation period, the organic treatment recorded the greatest mean leaf length (33.79 cm) and root number (16.80), followed by the inorganic treatment. At the same time, the control group exhibited the lowest performance. Statistical analysis using an independent sample t-test revealed significant differences (p < 0.05) between organic and inorganic treatments, confirming the superiority of organic fertilization. The findings indicate that organic fertilizer enhances soil structure, microbial activity, and sustained nutrient release, leading to improved plant growth and development. The study concludes that organic fertilization is a more effective and sustainable approach for onion production compared to inorganic fertilizers.

Keywords:

Inorganic Fertilizer, Onion Growth, Organic Fertilizer, Soil Fertility, Sustainable Agriculture, Butuan City, Philippines