Abstract
A factorial experiment in RCBD was conducted in the season 2002 at technical institute of Mosul at Namrood location to study the effect of distance between holes (20,30,40 cm) and levels of N fertilizer (120,160,200,240 kg Urea/ha.) on vegetative characters and yield and its components using cotton variety Koker-310. The results revealed significant effects and quadratic trend for number of fruiting branches and seed cotton yield, while number of bolls/plant was affected significantly with linear trend, where 40 cm planting distance recorded significant higher for number of fruiting branches and seed cotton yield. The number of bolls/plant was significant higher at 30 cm and just higher than distance 40 cm which revealed significant response for these characters with increasing distance between holes. The nitrogen fertilization levels had significant effect to increase number of fruiting branches, number of bolls/plant, boll weight and seed cotton yield when adding 240 kg Urea/ha. , Trend analysis for nitrogen fertilization levels revealed significant linear for these characters as well as seed index except seed cotton yield revealed to significant cubic trend. The distance between holes and levels of nitrogen fertilization interaction where significant for boll weight and seed cotton yield with significant trend analysis (AL BQ) and (AQ BQ) respectively and (AL BL) for lint percentage.
