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Title:: Effects of Different Types of Urea on Nitrogen Accumulation and Nitrogen Use Efficiency of Soybean

Author(s):: ?GU Si-yu¹; LIU Shuang¹; SUN Jia-yue¹; LIU Chang-sheng²; WANG Rui¹; WANG Hai-jiang¹; LIU Xiao-bing³; ?（1.College of Resources and Environment,Northeast Agricultural University，Harbin 150030,China; 2.Haolianghe Fertilizer Factory，Yichun 153103,China; 3.Northeast Institute of Geography and Agroecology，Chinese Academy of Sciences，Harbin 150030,China）

Abstract:: ?A field experiment with 7 treatments of different types of urea and several nitrogen rates was conducted to study the effects of controlledrelease urea on soybean agronomic characteristics, nitrogen contents and seed yield. Polypeptide urea(PU), longacting sustainreleased urea(LSU), large granule urea and sulfurcoated urea improved the dry matter, nitrogen accumulation, nitrogen use efficiency (NUE) and seed yield compared to the common urea. The treatments of 60 kg〖DK1〗·ha-1 PU and LSU increased dry matter, total accumulated nitrogen and NUE obviously, and at the pod filling stage, the three indexes increased by 11.1 and 18.1 g·m^-2, 0.83 and 1.11 g·m^-2, 10.73% and 15.16%, respectively. The treatments of 75 kg·ha^-1PU and 60 kg·ha^-1? LSU had best yieldincreasing effect, and seed yield increased by 9.5% and 11.0%, respectively.