عنوان مقاله [English]
نویسندگان [English]چکیده [English]
In order to study the growth of winter cereals under different amount of nitrogen fertilizer application, an experiment was carried out in Research Field of Gonbad-e- Kavous University during 2013-2014. Cereals including bread wheat (Triticum aestivum L.) cv. Koohdasht, durum wheat (Triticum turgidum L.) cv. Seimareh, six rowed barley Sahra, two rowed barley Khoram, naked barley Line 17 (Hordeum vulgare L), Canadian oat (Avena sativa L.) and triticale Javaniloo (Triticosecale Wittmack L.) at two nitrogen levels as zero and optimum (bread wheat 150 kg ha-1, durum wheat 120 kg ha-1, two row barley 12 kg ha-1, six row barley 210 kg ha-1, hull less barley 150 kg ha-1, oat 90 kg ha-1 and triticale 240 kg ha-1) considered as treatments. Results indicated that among the cereals triticale had the highest grain yield (409.45 gr m-2) while oat had the lowest (182.95 gr m-2). The maximum of leaf area index varied between 6.07 (triticale) and 3.28 (hull less barley). Triticale with 2054.9 gr m-2 and durum wheat with 1528 gr m-2 had the highest and lowest accumulation dry matter, respectively. Maximum CGR was observed in triticale (45.19 gr m2 day-1) while the minimum CGR was in durum (29.78 gr m2 day-1). Leaf area index, crop growth rate, relative growth rate and leaf area duration showed positive and significant correlation with yield. Critical leaf area index of triticale was more than other cereals (6.05). According to the results, triticale is the best plant to cultivation in Gonbad- e- Kavous condition.