Effect paclobutrazol and NPK fertilizer on generative fase and clorophyll content of soybean (Glicine max L.) variety Anjasmoro

Soybean (Glycine max) is a popular food ingredient due to its high protein content. Despite soybean cultivation in Indonesia, it is not yet at its best and requires further enhancement. Paclobutrazol (PBZ) is a plant growth regulator (PGPR) that can increase production by suppressing the vegetative phase and increasing the generative phase whereas, the use of NPK fertilizers can improve the yield quality of soybeans. The objective of this study is to investigate how different concentrations of PBZ and NPK fertilizers impact the growth and yield of soybean plants. This research was carried out from May to August 2024 in Semolowaru, a neighborhood in Surabaya, East Java. This research used the split plots design (SPD) method, in this study testing the concentration of paclobutrazol (0 ppm, 50 ppm, 100 ppm, and 150 ppm) and the dose of NPK fertilizer (150 kg/ha, 200 kg/ha, 250 kg/ha, and 300 kg/ha). Paclobutrazol concentration of 150 ppm and NPK fertilizer dose of 300 kg/ha showed the best results in the parameters of plant height, number of flowers, number of seeds, and chlorophyll content.