Effects of density and nitrogen fertilizer on number of ear, number of grains and grain weight in maize cultivars

In this study, the “Effects of density and nitrogen fertilizer on number of ear, number of grains and grain weight in maize cultivars” an experiment was carried out at Research Station of Agriculture and Natural Resources of Miandoab during 2011 and 2012. The experiment was conducted as split-plot factorial based on completely randomized block design with four replications. Cultivars hybrids included SC370 (early hybrid of corn) and SC704 (late hybrid of corn) were in main plot. The sub plots included plant densities (60000, 70000, 80000 and 90000 plants ha-1) and nitrogen fertilizer (200, 300, 400 and 500 kg ha-1). In this study indicated that number of grains, number of ear per square meter (ear/ m2) and 1000-grain weight (g) of SC704 was significantly higher than SC370. It was found that increasing density significantly increased the number of ears per unit area. The increasing density decreased one thousand grain weight but The highest seed weight was observed at the highest levels of nitrogen. interaction of plant density and nitrogen effects on Number of grains per ear was significant and highest number of grains per ear obtained from the density of 70 thousand plants ha -1