Effectivenes of NPK compound (10-30-20) to improve growth and yield of hybrid maize on vertisol soil

To determine the effectiveness of NPK compound (10-30-20) fertilizer to maize growth and yield, a study was conducted on vertisol soil of the rainfed rice field in Gambir Kuning village, Kraton District Pasuruan Regency, from September 2020 until February 2021. The study was arranged in randomized block design with four replications. As the treatment i.e., A. control (without inorganic fertilizer), B. standard/local recommendation (NPK 15-15-15) 300 kg, C. NPK (10-30-20) 100 kg, D. NPK (10-30-20) 200 kg, E. NPK (10-30-20) 300 kg, F. NPK (10-30-20) 400 kg, G. NPK (10-30-20) 500 kg ha-1. Except for control, all treatments were fertilized with 200 kg Urea and 100 kg ZA. P27 hybrid maize variety was used as an indicator plant. The results showed that the applications of NPK compound ((10-30-20) were increasing plant growth and yield effectively. The optimum dosage of NPK (10-30-20) was 499.55 kg ha-1. Treatment F produced the highest yield (6.83 tons ha-1) and was significantly different from the control (4.13 tons ha-1) and higher than the standard (6.24 tons ha-1). This treatment also gave the highest RAE value (127,55).