Growth and yield of sweet potato in response to the application of nitrogen rates and paclobutrazol

The excess of nitrogen (N) causes the overgrowth sweet potato foliage, increasing self-shading and reducing root yield. Therefore, a combined N paclobutrazol (PBZ) application can reduce vegetative benefit purpose this study was to evaluate plant growth, yield, uptake removal by plants fertilized with treated PBZ during two planting seasons. treatments consisted four rates (0, 50, 100 200 kg·ha–1), three forms (PBZ-10: applied at 10 days after side-dressing fertilization [DASNF]; PBZ-25: 25 DASNF, PBZ-10 + 25: plus DASNF), control (without application). Paclobutrazol temporarily reduced length main branches planted in rainy season, but it did not shoot biomass both A single DASNF increased yield fresh storage roots seasons, but, increases were greater when applications carried out. 50 kg·ha–1 season sufficient reach maximum roots, dry without benefiting