Abstract
Nitrogen (N) is one of the decisive elements for plant growth, crop biomass accumulation, and yield formation of cereal crops. However, managing N in crop production and comparing N use efficiency are challenging without prior knowledge of in-season crop N status. The development of critical N (Nc) dilution curves based on allometry between plant metabolic and structural compartments allows the estimation of crop N nutrition status by determining the N nutrition index (NNI). The purpose of this article is to review the research progress on the development of Nc curves in three major cereal crops (wheat, maize, and rice). The focus of this review paper is to compare the Nc curves of major cereals developed worldwide and to explain the differences in these Nc curve parameters in light of genotype through the management of environmental interactions. Additionally, this review provides an update on the most relevant methods for non-destructive estimation of the NNI of major cereal crops using various remote sensing technologies for large-scale applications. This review also sheds light on the applicability of Nc curve-based NNI for in-season crop N diagnosis, crop N requirement, crop grain yield, and quality prediction. Moreover, this review outlines future research directions to expand the impact of this approach on crop production.
Original language | English (US) |
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Article number | 106998 |
Journal | Computers and Electronics in Agriculture |
Volume | 197 |
DOIs | |
State | Published - Jun 2022 |
Bibliographical note
Funding Information:This research was funded by the National Natural Science Foundation of China (31601222), the National Undergraduate Student Innovation Research and Entrepreneurship Training (SRT) of China (202110307003), the Jiangsu Province Key Technologies Research and Development Program (BE2021308), the Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the 111 Project (B16026), the Japan Society for the Promotion of Science for a Grant-in-Aid for Scientific Research (18KT0087), and the USDA National Institute of Food and Agriculture (State project 1016571). We would like to thank Gilles Lemaire from INRA for helpful revisions of the manuscript.
Publisher Copyright:
© 2022 Elsevier B.V.
Keywords
- Cereal crops
- Critical N dilution curve
- NNI
- Remote sensing