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| Comparative Analysis of Nitrogen Use Efficiency in Different Potato Production Areas of China |
| YU Jing1，XIONG Xing-yao2，GAO Yu-lin3，WANG Gui-jiang4，WANG Wan-xing2，LYU He-ping5，ZHU Jie-hua6，SHI Ying7，YANG Yan-li8，TANG Hao9，DONG Dao-feng10，FAN Ming-shou1* |
| （1College of Agronomy，Inner Mongolia Agricultural University，Hohhot 010019，Inner Mongolia，China；2Institute of Vegetables and Flowers，Chinese Academy of Agricultural Sciences，Key Laboratory of Biology and Genetic Improvement of Root and Tuber Crops，Ministry of Agriculture and Rural affairs，Beijing 100081，China；3Institute of Plant Protection，Chinese Academy of Agricultural Sciences，Beijing 100081，China；4Heilongjiang Academy of Agricultural Sciences，Harbin 150086，Heilongjiang，China；5Institute of Potato，Gansu Academy of Agricultural Sciences，Lanzhou 730070，Gansu，China；6College of Plant Protection，Agricultural University of Hebei，Baoding 071001，Hebei，China；7College of Agronomy，Northeast Agricultural University，Harbin 150030，Heilongjiang，China；8College of Plant Protection，Yunnan Agricultural University，Kunming 650201，Yunnan，China；9Crop Research Institute，Fujian Academy of Agricultural Sciences，Fuzhou 350013，Fujian，China；10Vegetable and Flower Institute，Shandong Academy of Agricultural Sciences，Jinan 250100，Shandong，China） |
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Abstract This paper analyzed and evaluated the nitrogen use efficiency actuality in potato production by questionnaire and literature retrieval method for nitrogen application rate，basic fertilizer application rate，potato yield，etc. in 6 potato producing areas；and probed into the effective way of improving PFP in potato production．The results showed that there were bigger differences in productivity of applied N（PFP）between different production areas．It was 184 kg·kg-1 in Northeastern China，110 kg·kg-1 in Southwestern China，104 kg·kg-1 in Central Plain Region，99 kg·kg-1 in Southern China，95 kg·kg-1 in Northwestern China，and 84 kg·kg-1 in North China，The main reason for low productivity of nitrogen fertilizer was excessive application of nitrogen fertilizer．The effective technical ways to reduce nitrogen application and increase efficiency were to adopt‘ big formula，small adjustment’regional fertilization technology；to apply nitrogen fertilizer recommended plan of combining soil test with plant diagnosis；to conduct fertilization pattern of mixing new fertilizer with organic fertilizer，thus to fully excavate yield potential，reduce nitrogen application，and increase efficiency．
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Received: 17 April 2019
Published: 06 May 2019
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