Comparison Growth and Accumulation Dry Matter of Winter Cereals in Nitrogen Limitation Condition

In order to growth study 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 include bread wheat Koohdasht (Triticum Aestivum L.) , durum wheat Seimareh (Triticum turgidum L.), six rowed barley Sahra, two rowed barley Khoram, naked barley Line 17 (Hordeum vulgare L), oat Canadian (Avena sativa L.) and triticale Javaniloo (Triticosecale Wittmack L.) at two nitrogen levels: 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 and triticale 240 kg.ha-1) were evaluated. 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.