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Controlled Release Urea Improved Nitrogen Use Efficiency, Yield, and Quality of Wheat


This article in AJ

  1. Vol. 103 No. 2, p. 479-485
    Received: Aug 6, 2010

    * Corresponding author(s): minzhang-2002@163.com
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  1. Yue-Chao Yanga,
  2. Min Zhang *a,
  3. Lei Zhengb,
  4. Dong-Dong Chenga,
  5. Ming Liua and
  6. Yu-Qing Genga
  1. a National Engineering Research Center for Slow/Controlled Release Fertilizers; State Key Laboratory of Crop Biology, College of Resources and Environment, Shandong Agricultural University, Taian 271018, China
    b Shangdong Kingenta Ecological Engineering Co., Ltd, Linshu 276700, China


The effects of newly developed controlled release urea (CRU) and its placement method on the N use efficiency and nutritional quality of winter wheat (Triticum aestivum L.) grown on a loam soil were investigated during 2 yr. The winter wheat was grown on a loam soil. The CRU was applied at 0, 75, 150, and 225 kg N ha−1 and the urea was applied at 225 kg N ha−1 The CRU was applied with wheat seeds during sowing while the urea treatment was split into two applications: two-thirds applied during sowing and one-third at the 5-tiller stage (Z25). Results showed that N release rates of CRU fit N requirements of wheat and the placement of wheat seeds with CRU improved wheat's apparent N uptake efficiency by 28.5% compared to urea treatment. Although the CRU treatment at 150 kg N ha−1 had one-third less supplied N than that of conventional urea treatment (225 kg N ha−1), the wheat with CRU at 150 kg N ha−1 produced 6.5% more grain. In addition, at the same or one-third reduced amount of N compared with the conventional urea treatment, CRU significantly increased the contents of Fe and Mn, providing additional nutrition and quality to the wheat grain.

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