Application of Organic Fertilizer and Coconut Water to Improve the Growth of Butterfly Tree (Bahunea purpurea L.) in Karst Land

Abstract

Butterfly tree (Bauhinia purpurea L.) is known to possess high adaptability and can be cultivated in karst regions of Indonesia. In this context, organic fertilization combined with coconut water as a natural growth hormone is applied to enhance plant growth. Therefore, this research aims to determine the interaction between various organic fertilizers and coconut water in increasing the growth of the butterfly tree in the experimental garden of the Faculty of Agriculture, UPN Veteran Yogyakarta. A Completely Randomized Design (CRD) was used with a Factorial method between August and September 2025. The first factor was the type of organic fertilizer, consisting of cow and goat manure, as well as vermicompost. The second factor was the 25%, 50%, and 75% concentrations of coconut water. The results showed that there was no interaction between organic fertilizers and coconut water. Organic goat manure and vermicompost produced percentage of live plants, plant height, and number of leaves than cow manure. Meanwhile, vermicompost showed the longest root length and the largest number of roots compared to cow and goat manure. The 50% coconut water concentration produced the largest percentage of live plants and the number of roots.