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Mixture of controlled release and normal urea to optimize nitrogen management for high-yielding (> 15 Mg ha(-1)) maize

文献类型： 外文期刊

作者： Guo, Jiameng 1 ; Wang, Yonghong 2 ; Blaylock, Alan D. 3 ; Chen, Xinping 1 ;

作者机构： 1.China Agr Univ, Coll Resources & Environm Sci, Ctr Resources Environm & Food Secur, Beijing 100193, Peoples R China

2.Ningxia Acad Agr & Forestry Sci, Inst Crop Sci, Yinchuan 750000, Peoples R China

3.Agrium Inc, Calgary, AB T2J 7E8, Canada

关键词： High-yielding maize;Controlled release urea;N use efficiency

期刊名称：FIELD CROPS RESEARCH （ 影响因子：5.224； 五年影响因子：6.19 ）

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收录情况： SCI

摘要： Continued population growth and the corresponding increase in consumption will mean increases in the global demand for food crops, especially maize, which is used as a food, feed and bioenergy crop. Optimal nitrogen (N) management for high-yielding maize (>15 Mg ha(-1)) is a challenge because the N demand at post-silking will increase significantly, and synchronization of the N supply with such demand will become more difficult. In this study, treatment variables consisted of one solely urea (split application before sowing and at 6 leaf stage) and two CRU-N (nitrogen from controlled-release urea (CRU))/Urea-N (nitrogen from urea) mixtures (1:2 and 2:1) with one-off application at two N rates (180 kg ha(-1) and 240 kg ha(-1)) in two experimental years (2013 and 2014). The results indicated that an one-off application of the blend of CRU and urea before sowing was able to satisfy the N demand of a high-yielding maize system (>15 Mg ha(-1)); the results also showed a greater percentage of N accumulation at post-silking (51%-63%) with the grain yields ranging from 16.9 Mg ha(-1) to 19.3 Mg ha(-1), and one-off application a mixture of CRU and urea with 2:1 at 180 kg N ha(-1) achieved the lowest N losses (80 kg N ha-1 and 12 kg N ha(-1)), while a mixture of CRU and urea with 1:2 at 240 kg N ha(-1) got highest economic return in both years. This work demonstrates that blending CRU and urea in an one-off application could potentially improve grain yields and create a simpler, more efficient and business-friendly system of high-yielding maize production. (C) 2017 Elsevier B.V. All rights reserved.

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