Crop Science and Agriculture

In order to investigate the eff ect of diff erent potassium levels and hybrid maize varieties on the yield and yield components of maize, an experiment was carried out at the Bajeng Experimental Station, Indonesian Cereals Research Institute, Gowa, South Sulawesi, from May to September 2017. Th e level of K on site of the experiment is 0.26 mg kg-1. Th e potential grain yield of three hybrid maize varieties has diff erent. Nasa-29 has potential grain yield (13.5 t ha-1), Bima-20 (12.8 t ha-1) and Bima-4 (11.7 t ha-1). Th e experiment was laid out in randomized split plot design with three replications having a plot size of 9 m×6 m with planting density 75×25 cm. Th e main plot was 6 levels of potassium (0, 20, 40, 60, 80 and 100) kg K2O ha-1. Th e sub plot was 3 hybrid maize varieties (Nasa-29, Bima-20 and Bima-4). Results indicated that the interaction of diff erent levels of potassium and hybrid maize varieties signifi cantly infl uenced maize plant height, cob diameter, weight of 1000 grains, and grain yield. Th e application of potassium at the rate of 60 kg K2O ha-1 and Nasa-29 variety resulted in the highest grain yield (11.33 t ha-1) under field condition the agro-ecological of Gowa, South Sulawesi.