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<p>The critical nitrogen dilution curve (CNDC) and the nitrogen nutrition index (NNI) are robust physiological frameworks for diagnosing in-season plant nitrogen (N) status and formulating optimized nitrogen management strategies. The objective of the study was to develop a CNDC for the spring wheat cultivar HD-3086 and to optimize the N dose based on NNI. Thus, the CNDC was developed using multi-season experimental field data, with the treatments comprising graded N dosages using multiple approaches. The results suggested that the CNDC(G) developed in this study is: Nc = 3.74W<sup>−0.431</sup> for a biomass range of 0.96–10.57&#xa0;tons&#xa0;ha<sup>−1</sup>. Additionally, a 96% relative yield in wheat can be obtained by maintaining an NNI value of 0.93 at the jointing stage by increasing the N dose from 120 to 180&#xa0;kg&#xa0;N&#xa0;ha<sup>−1</sup>. By linking remote sensing and crop simulation modelling, CNDC- and NNI-based N management can be adopted as a sustainable in-season N management strategy in farmers’ fields.</p> Graphical abstract <p></p>

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Integrating critical nitrogen dilution curve, nitrogen nutrition index, and yield response modelling to optimize nitrogen requirement in spring wheat

  • 期刊论文

  • 发表日期：

    2026年2月18日

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  • Koushik Bag,
  • Vinay Kumar Sehgal,
  • Rajkumar Dhakar,
  • Kalikinkar Bandyopadhyay,
  • Manoj Shrivastava,
  • Tapan Jyoti Purakayastha,
  • Soumen Pal

摘要

The critical nitrogen dilution curve (CNDC) and the nitrogen nutrition index (NNI) are robust physiological frameworks for diagnosing in-season plant nitrogen (N) status and formulating optimized nitrogen management strategies. The objective of the study was to develop a CNDC for the spring wheat cultivar HD-3086 and to optimize the N dose based on NNI. Thus, the CNDC was developed using multi-season experimental field data, with the treatments comprising graded N dosages using multiple approaches. The results suggested that the CNDC(G) developed in this study is: Nc = 3.74W−0.431 for a biomass range of 0.96–10.57 tons ha−1. Additionally, a 96% relative yield in wheat can be obtained by maintaining an NNI value of 0.93 at the jointing stage by increasing the N dose from 120 to 180 kg N ha−1. By linking remote sensing and crop simulation modelling, CNDC- and NNI-based N management can be adopted as a sustainable in-season N management strategy in farmers’ fields.

Graphical abstract