Veronika Vellin

This thesis examines the growth response and yield performance of long bean (Vigna sinensis L.) variety Pertiwi F1 in relation to the application of Triple Super Phosphate (TSP) and Kascing (earthworm castings) fertilizers. The study employed an experimental approach using a factorial design to assess plant responses to various fertilizer dosages and to determine the most effective treatment for optimizing growth and production. The research measured key parameters including plant height, number of branches, pod length, pod weight, and total yield. The results demonstrated that TSP fertilizer significantly influenced fruit weight, with the optimal effect observed at a dosage of 10.8 g per polybag (equivalent to 300 kg/ha). In contrast, Kascing fertilizer did not produce significant effects on most growth and yield parameters, although the application of 72 g per polybag (equivalent to 20 tons/ha) resulted in the highest pod yield among the Kascing treatments. Additionally, the interaction between TSP and Kascing fertilizers showed no significant impact on the observed variables. The novelty of this research lies in its combined evaluation of inorganic and organic fertilizers in a polybag cultivation system, which is relevant for small-scale and limited-land agricultural practices. The strength of this study is its evidence-based recommendations that contribute to more efficient fertilization strategies, offering practical guidance for improving long bean productivity under controlled cultivation conditions.