TY - JOUR T1 - Study of Nitrogen Use Efficiency Indices in the Double Cropping Rotations of Wheat (Triticum aestivum L.) in Ilam TT - ارزیابی شاخص‌های کارآیی نیتروژن در تناوب‌های دوگانه گندم در ایلام JF - JCPP JO - JCPP VL - 5 IS - 18 UR - http://jcpp.iut.ac.ir/article-1-2482-en.html Y1 - 2016 SP - 327 EP - 337 KW - Nitrogen uptake efficiency KW - Nitrogen use efficiency KW - Nitrogen utilization efficiency KW - Rotation KW - Wheat N2 - This study was carried out under temperate climate condition of Ilam province, Iran, during 2012-2013 growing season to determine the suitable crop rotation for enhancing nitrogen uptake, utilization, and use efficiency of wheat. A two factor experiment was laid out as split plot arrangement (RCBD) with four replications. The main plots consisted of 6 pre-sowing plant treatments (control, Perko, Buko, Clover, Oilseed radish and combination of three plants Ramtil, Phaselia, Clover), and sub-plots were allocated to four levels of nitrogen fertilizer (Zero, conventionally recommended fertilizer, 50% lower and 50% higher than the recommended fertilizer). Results showed that nitrogen use efficiency (NUE), nitrogen uptake efficiency (NUpE), nitrogen utilization efficiency (NUtE) and nitrogen efficiency ratio (NER) in wheat were significantly affected by crop rotation and nitrogen fertilizer and their interaction. The lowest and highest nitrogen use efficiencies were achieved in oilseed radish-wheat and fallow-wheat rotations. The greatest nitrogen use efficiency in oilseed radish-wheat was due to high utilization efficiency of nitrogen in the rotation. The greatest and smallest nitrogen utilization efficiencies (NUtE) were observed in oilseed radish-wheat and fallow-wheat rotations, respectively. Perko-wheat rotation with application of nitrogen at the conventional level for wheat brings about an acceptable economic yield and high nitrogen uptake and use efficiency and seems to be advantageous to other rotations. M3 10.18869/acadpub.jcpp.5.18.327 ER -