Effect of nitrogen fertiliser rates and plant density on grain yield of maize

Low soil fertility has constrained maize production in Sidama district in the Southern region of Ethiopia. The effects of four levels of nitrogen fertiliser (0, 46, 92, 138 kg N ha-1) and four plant populations (44000, 53000, 67000 and 89000 plants ha-1) on grain yield of maize were evaluated over four years (1995-98) at Awassa Research Centre. The experiment was laid out in a randomised complete block design arranged as a complete factorial with three replicates. Effect of N application was dependent on seasonal distribution of precipitation (