Effect of different levels of plant density and time of nitrogen application on Canola oil quality and quantity (cultivar Hyola 401) in Ahvaz conditions

摘要

In order to study the effects of plant density and time of nitrogen application on Canola oil quality and quantity in Ahvaz conditions, an experiment was conducted at Agricultural College of Shahid Chamran University of Ahvaz The experiment design was split plot in completely randomized block basis with 4 replications. In this study main plots and sub plots were consisted of 3 levels of plant density (60, 80 and 100 plants per m2) and 3 times of nitrogen fertilizer application (T1: application of nitrogen in 3 times, 1/3 at sowing date, 1/3 at stem elongation stage and 1/3 at the beginning of flowering. T2: application of nitrogen in 2 times:1/3 at sowing date and 2/3 at stem elongation stage. T3: application of nitrogen in 2 times: 1/2 at sowing date and 1/2 at stem elongation) respectively. The results showed that different levels of treatments and interaction of them had no significant effects on percents of Palmitic acid, Palmitoleic acid, Stearic acid, Linolenic acid and Arashitic acid. But use of nitrogen in tree times decreased the oil percent, erosic acid percent, ratio of erosic acid to oleic acid, saturated to unsaturated fatty acids and polyunsaturated to monounsaturated fatty acids. Use of nitrogen in tree times, especially at higher plant densities, increased the percent of oleic acid. Increasing in level of plant densities from D1 to D2 lead to decrease of Linoleic acid. Minimum ratio of polyunsaturated fatty acids to monounsaturated fatty acids obtained from 80 plants/m2 and any changes (decrease or increase of plant density), can increase this ratio and oil quality will be decreased. According to these results at Ahvaz conditions, Canola planting at 80 plants/m2 and use of nitrogen at tree times (D2T1) lead to Higher oil quality.