Effects of the Combined Application of Control-Released Urea and Urea on Tillers，Yield，Soil NO3－-N and Nitrogen Balance of Winter Wheat

doi:10.3969/j.issn.1000-7091.2012.02.037

Abstract

Abstract: This conducted field experiment was to examine the effects of N managements of conventional，optimized and the combination of urea and control released urea on winter wheat stem tillers，yield，soil NO－?3-N dynamic?and nitrogen balance． Seven treatments including control (CK)，conventional N (Ncon)，optimized N (Nopt)，control released urea(100%)(CRU1)，urea(33． 3%) + control released urea(66． 7%)(CRU2)，urea(66． 7%) +?control released urea(33． 3%) (CRU3) and urea (100%)(CRU4) were conducted． It shows that during the two?winter wheat seasons，although no significant difference on the amount of tillers among different N treatments were identified and no significant impact on the reduction of soil nitrate accumulation by applying control released urea in?combination with urea was found，through this study，slightly higher yields，nitrogen recovery (RE)，agronomic efficiency(AE) and partial productivity (PP) in the treatment of CRU2 (ratio of urea to control released urea 2∶ 1)?were obtained，indicating it a relative better nitrogen management practice．

Key words: Control released urea, Urea, Winter wheat, Yield, Nitrogen balance

CLC Number:

S143.1

WANG Hong-fei, GAO Zhi-ling, CHEN Xin-ping, LIU Shu-qing. Effects of the Combined Application of Control-Released Urea and Urea on Tillers，Yield，Soil NO₃^－-N and Nitrogen Balance of Winter Wheat[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2012, 27(2): 196-201. doi: 10.3969/j.issn.1000-7091.2012.02.037.

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Effects of the Combined Application of Control-Released Urea and Urea on Tillers，Yield，Soil NO₃^－-N and Nitrogen Balance of Winter Wheat

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