نوع مقاله : مقاله پژوهشی
نویسندگان
1 استادیار پژوهش بخش خاک و آب مرکز تحقیقات کشاورزی و منابع طبیعی خوزستان
2 دانشیار پژوهش بخش تحقیقات اصلاح و نهال و بذر مرکز تحقیقات کشاورزی و منابع طبیعی خوزستان
چکیده
کلیدواژه‌ها
عنوان مقاله [English]
نویسندگان [English]
Canola planted in rotation with summer crops (e.g. corn) would cause sowing delay, yield reduction, and economic income of farmers. Based on previous research, the most suitable sowing date for canola is about 15-30 November. To investigate effects of late planting on canola yield and nitrogen use efficiency (NUE) a study was conducted in randomized complete blocks design in split plots with three replications. The experiment was carried out for 2 years (2004-2006) in Shavoor agricultural research station of Khuzestan Province. Treatments included four sowing dates, 11th Nov, 21st Nov, 1st Dec and 11thDec in the main plots, and five nitrogen levels (0, 50, 100, 150 and 200 kg N ha-1) in the sub plots. Results showed that sowing date and nitrogen levels had significant effects on yield components and nitrogen use efficiency (α<0.01). Delay in sowing date from Nov (11) to Dec (11) reduced 24.6 pods /plant, 3.1 seed/pod , 0.43gr of thousands seed weights, 1084 kg.ha-1 seed yield, 5.6 % oil seed, and 6.9 % NUE. Increasing nitrogen application rate from 150 to 200 kg N ha-1, increased yield and yield components significantly, but NUE was decreased about 2.2 %. It can be concluded that since normal sowing date (11th Nov- 21st Nov) with 150 kg N ha-1 can produce the highest yield, late planting date is not recommended in Khuzestan Province conditions.
کلیدواژه‌ها [English]
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