Long bean production has decreased in Indonesia due to uncertain seasonal factors, such as long dry seasons and short rainy seasons. Long bean production has decreased due to inappropriate and optimal cultivation techniques. Several efforts can be made to overcome the problem of decreasing long bean productivity by fertilizing and applying growth regulators (ZPT). The aim of this research is to understand the combined effect of KNO3 fertilizer doses and paclobutrazol concentrations on the growth and yield of long bean plants. The research was conducted in Ketawang Village Land, Nganjuk, East Java. The research was a factorial experiment with Divided Plot Design (RPT) which consisted of two treatment levels, namely KNO3 fertilizer dose (0 g/plant, 8 g/plant, 10 g/plant and 12 g/plant) and paclobutrazol concentration (0 ppm, 150 ppm , 175 ppm and 200 ppm). The best treatment combination was 8 g/plant KNO3 and 175 ppm paclobutrazol which affected the number of leaves, age at flower emergence, number of flowers, number of pods per plant and fruit set (%).