نویسندگان
دانشگاه گنبد کاووس
چکیده
کلیدواژهها
عنوان مقاله [English]
نویسندگان [English]
In order to evaluate the effects of different nitrogen rates on light interception and radiation use efficiency in winter cereals, an experiment was carried out in research field of Gonbad-e-Kavous University with four replications during 2013-2014. Treatments were cereals including bread wheat cv. Koohdasht, durum wheat cv. Seimareh, six row barley Sahra, two row barley Khoram, hull less barley Line 17, Canadian triticale and oat cv. Javaniloo and nitrogen fertilizer at two levels as zero and optimum (bread wheat 150 kg ha-1, durum wheat 120 kg ha-1, two row barley 120 kg ha-1, six row barley 210 kg ha-1, hull less barley 150 kg ha-1, oat 90 kg ha-1and triticale 240 kg ha-1). Results indicated that zero and optimum amount of nitrogen rate had no significant effect on extinction coefficient. Calculated K were for triticale 0.67±0.03, bread wheat 0.86±0.03, for durum wheat 0.77±0.03, for six rowed barley 0.79±0.03, for two rowed barley 0.80±0.03, for hull less barley 0.74±0.05 and for oat 0.76±0.04. Radiation use efficiency obtained from 2.02 to 2.78 grMJ1 m-2 in cereals. Radiation use efficiency gained were for oat 2.17± 0.048, for durum wheat 2.02±0.07, for bread wheat 2.42±0.13, for two rowed barley 2.33± 0.09, for hull less barley 2.52±0.11, for six rowed barley 2.39±0.08 and for triticale 2.78± 0.14
کلیدواژهها [English]
)