American-Asian-Journal of agricultural & environmental sciences/American-Eurasian journal of agricultural & environmental sciences · 2010 · 12 citations · 10 references
AgricultureAgronomyCrop SciencesCrop ProductionPlant NutritionSeed ScienceCrop NutritionNitrogen NutritionOilseed AgronomySeed ProductionNitrogen Effects On YieldNitrogen Fertilization EffectsNitrogen Fertilizer ManagementOil Content In GrainsOil Content YieldSeed Oil AccumulationSowing TimeSplit Nitrogen Application
In order to investigate the effect of nitrogen rates and splitting on oil and seed yield of canola, a field experiment was conducted at Jouybar (Iran) in 2008. The experimental was evaluated in a split-plot with two rates of nitrogen fertilizer N , N kg N ha and check (N ) and three nitrogen splitting T (50% in sowing time 100 200 0 1 1 and 50% in stem elongation (bolting) begins), T (25% in sowing time, 50% in stem elongation (bolting) begins 2 and 25% in first flower opens growth stage) and T (25% in sowing time, 25% in stem elongation (bolting) 3 begins and 25% in first flower opens and 25% in flowering ends). Results indicated that N had higher seed, 200 straw and biological yield than N , so that seed yield relation to check had increased 111and 82%, 100 respectively. T had the highest straw and biological yields ,while T had the lowest, respectively. The highest 13 and lowest oil content was obtained with T and T , respectively. The highest and the lowest nitrogen content 23 was obtained with T and T , respectively. N had greater number of pods per plant and number of seeds per 3 1 200 pod than N. T and T had the greatest and the least number of pods per plant and also number of seeds per 100 2 3 pod, respectively. In interactions, Number of pods per plant and number of seeds per pod was the greatest at N T and the least at N T. Interaction of N T and N T had the highest and the lowest seed oil content; 200 2 100 3 100 2 100 3 respectively. The interaction between N and T and between N T had the highest and the lowest seed 200 3 100 and 1 nitrogen content, respectively. The interaction between N and T and between N T had the highest and 200 2 100 and 3 the lowest seed yield, respectively. There is positive correlation between seed yield and number of pods per plant. Consequently, low nitrogen and high splitting application decreased oil content , whereas, seed yield and oil yield were increased by increasing nitrogen rates.
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