Determination of critical nitrogen dilution curve for winter wheat in Guanzhong Plain
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DOI:10.7606/j.issn.1000-7601.2019.04.11
Key Words: Guanzhong plain, winter wheat, critical nitrogen concentration, nitrogen nutrition index, accumulated nitrogen deficit
Author NameAffiliation
QIANG Sheng-cai College of Urban and Rural Construction, Shanxi Agricultural University, Taigu, Shanxi 030801, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F University, Yangling, Shaanxi 712100, China 
ZHANG Fu-cang Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F University, Yangling, Shaanxi 712100, China
Institute of Water-saving Agriculture in Arid Areas of China, Northwest A&F University, Yangling, Shaanxi 712100, China 
ZHANG Yan College of Urban and Rural Construction, Shanxi Agricultural University, Taigu, Shanxi 030801, China
Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F University, Yangling, Shaanxi 712100, China 
YAN Shi-cheng Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F University, Yangling, Shaanxi 712100, China 
XIANG You-zhen Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F University, Yangling, Shaanxi 712100, China 
LI Zhi-jun Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas of Ministry of Education Northwest A&F University, Yangling, Shaanxi 712100, China 
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Abstract:
      The critical nitrogen concentration can be used to diagnose the crop nitrogen status. At present most domestic researchers only establish the curvefor a single variety. However, establishing a universal curve based on multiple varieties can significantly improve the application of the model. Six popular varieties of winter wheat and four nitrogen levels N0(0)、N1(105 kg·hm-2)、N2(210 kg·hm-2)and N3(315 kg·hm-2)were applied in this study. The critical nitrogen dilution curveand the accumulated nitrogen deficit model were constructed based on the aboveground dry matter from re-growth to heading stages, and the results were compared with published Nc curves. The relation ship between maximum above ground dry matter and critical N concentration of winter wheat could be described in the form of negative power function. The nitrogen nutrition index and accumulated N deficit model were further derived from the critical nitrogen dilution curve, which can be used to evaluate the nitrogen nutrition status and quantify the N deficit of winter wheat, respectively. Results show that the nitrogen nutrition index increases with the N application rate. N0 and N1 nitrogen application rates showed nitrogen nutrition deficiencies, but nitrogen nutrition surplus was revealed in the N2 and N3 treatments. When nitrogen application rate was 0~315 kg·hm-2, the accumulated N deficit (Nand) ranged from -33.2 kg·hm-2 to 50.9 kg·hm-2, and increased as winter wheat grew. Through the linear fitting between NNI and N application rates, a suitable N rate of about 162 kg·hm-2 was obtained for winter wheat in Guanzhong Plain.
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