A bibliometric-based analysis of research advances in the field of nitrogen monitoring in wheat

In order to keep up the research dynamics in the field of nitrogen monitoring in wheat, this paper explores the current status and content evolution through visual analysis. Using bibliometric methods, we mined the trend of publications, subject areas, countries, institutions, journals and highly cited papers, research hotspots, and theme evolution between 1990 and 2022, and analyzed the intersection of disciplines and the concentration of literature. The research found that the global publication volume is generally on the rise, and China is the fastest growing country in recent years, but it can be further improved in terms of the number of local citations and the total number of citations. The field of wheat nitrogen monitoring has changed from one single discipline to multidisciplinary, the hotspots have evolved from the analysis of a single physiological process to the monitoring of remote sensing, crop modeling, growth simulation, and other directions. The research hotspots have evolved from the early stage of single physiological process analysis to the direction of digital agriculture, forming two major research nodes in the world represented by China and the United States. Six of the top ten authors are from China, and China occupies six seats in the top ten organizations, and China ranks in the top in all four indicators of highly cited papers. As time goes on, the tendency of teamwork and international cooperation has become evident, and the proportion of collaborative publications between China and the top ten countries is 31.48%. Agronomy journals are the main publications, with Field Crops Research being the most representative. The results show that the cross-disciplinary trend has become more and more obvious, the development trend of research hotspots and fields has become clearer and clearer, and in the future, the in-depth cooperation among different countries, disciplines, and teams will bring greater and more far-reaching opportunities.