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Journal of Integrative Agriculture  2021, Vol. 20 Issue (6): 1474-1486    DOI: 10.1016/S2095-3119(21)63622-5
Special Focus: High quality and high efficiency fertilization of rice Advanced Online Publication | Current Issue | Archive | Adv Search |
Determining nitrogen status and quantifying nitrogen fertilizer requirement using a critical nitrogen dilution curve for hybrid indica rice under mechanical pot-seedling transplanting pattern
YAO Bo1, HE Hai-bing1, XU Hao-cong1, ZHU Tie-zhong1, LIU Tao1, KE Jian1, YOU Cui-cui1, ZHU De-quan1, WU Li-quan1, 2 
1 College of Agronomy, Anhui Agricultural University, Hefei 230000, P.R.China
2 Jiangsu Collaborative Innovation Center for Modern Crop Production, Nanjing 210095, P.R.China
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摘要  

以优质丰产杂交中籼稻徽两优898和Y两优900为试验材料开展田间小区试验,钵苗机插条件下设置5个施氮量处理 (0、75、150、225、300 kg ha-1),利用不同生育时期水稻地上部干物质量累积和植株氮浓度构建钵苗机插杂交籼稻临界氮浓度稀释曲线,利用该曲线计算NNI和Nand诊断氮素营养状况,进而探究NNI 与Nand和相对产量(RY)的关系。施氮处理显著增加钵苗机插杂交籼稻地上部生物量和植株氮浓度(P<0.05),钵苗机插杂交籼稻临界氮浓度(Nc)与地上部生物量(DM)之间符合幂函数曲线Nc=4.02DM-0.42R2=0.97),模型RMSE 和n-RMSE 分别为0.23、10.61%,表明模型具有较好的准确性和稳定性。整个生育期内植株NNI 值范围为0.58~1.31,与之对应的Nand值为-55~109 kg ha-1。各生育时期NNI与Nand的存在显著线性模型关系(0.53<R2<0.99P<0.01),而NNI与RY间满足线性平台模型关系(0.73<R2<0.92,P<0.01)。本研究构建模型可用于诊断钵苗机插杂交籼稻氮素营养状况,为定量氮肥管理提供依据。




Abstract  
Field experiments of nitrogen (N) treatment at five different application rates (0, 75, 150, 225, and 300 kg ha−1) were conducted under pot-seedling mechanical transplanting (PMT) in 2018 and 2019.  Two high-quality and high-yielding hybrids of indica rice, Huiliangyou 898 and Y Liangyou 900, were used in this study.  The N nutrition index (NNI) and accumulated N deficit (Nand), used to assess the N nutrition status in real-time, were calculated for the indica cultivars under PMT with a critical nitrogen concentration (Nc) dilution model based on shoot dry matter (DM) during the whole rice growth stage.  The relationships between NNI and Nand with relative yield (RY) were determined, and accurate N application schemes were developed for hybrids indica rice under PMT.  The results indicated that high application rate of N-fertilizer significantly increased the concentrations of shoot DM and N in aboveground organs during the observed stages in the two cultivars for two years (P<0.05).  The Nc dilution model of hybrid indica cultivars was Nc=4.02DM−0.42 (R2=0.97) combining the two cultivars under PMT.  Root-mean-square error and normalized root-mean-square error of the curve verification were 0.23 and 10.61%, respectively.  The NNI and Nand ranged from 0.58 to 1.31 and 109 to –55 kg ha−1, respectively, in the two cultivars for all N treatments.  NNI showed a linear relationship with Nand during the entire growth stage (0.53<R2<0.99, P<0.01).  In addition, NNI showed a linear-plateau relationship with RY (0.73<R2<0.92, P<0.01) throughout the observed stages.  These results suggest that the models can accurately diagnose the N-nutrition status and support effective N-fertilizer management in real-time for hybrid indica rice under PMT.
Keywords:  rice        yield        critical nitrogen concentration        nitrogen nutrient index  
Received: 13 December 2020   Accepted:
Fund: This work was supported by the National Key R&D Program of China (2016YFD0300608, 2016YFD0300505 and 2017YFD0301305) and the Key Research and Development Program of Anhui Province, China (1804h07020150).
Corresponding Authors:  Correspondence WU Li-quan, E-mail: wlq-001@163.com   
About author:  YAO Bo, E-mail: yaobo950924@163.com

Cite this article: 

YAO Bo, HE Hai-bing, XU Hao-cong, ZHU Tie-zhong, LIU Tao, KE Jian, YOU Cui-cui, ZHU De-quan, WU Li-quan. 2021. Determining nitrogen status and quantifying nitrogen fertilizer requirement using a critical nitrogen dilution curve for hybrid indica rice under mechanical pot-seedling transplanting pattern. Journal of Integrative Agriculture, 20(6): 1474-1486.

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