{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,2,17]],"date-time":"2026-02-17T11:36:03Z","timestamp":1771328163628,"version":"3.50.1"},"reference-count":68,"publisher":"MDPI AG","issue":"22","license":[{"start":{"date-parts":[[2019,11,19]],"date-time":"2019-11-19T00:00:00Z","timestamp":1574121600000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100000040","name":"Agriculture and Agri-Food Canada","doi-asserted-by":"publisher","award":["1130"],"award-info":[{"award-number":["1130"]}],"id":[{"id":"10.13039\/501100000040","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000040","name":"Agriculture and Agri-Food Canada","doi-asserted-by":"publisher","award":["1313"],"award-info":[{"award-number":["1313"]}],"id":[{"id":"10.13039\/501100000040","id-type":"DOI","asserted-by":"publisher"}]},{"DOI":"10.13039\/501100000016","name":"Canadian Space Agency","doi-asserted-by":"publisher","award":["17SUSOARTO"],"award-info":[{"award-number":["17SUSOARTO"]}],"id":[{"id":"10.13039\/501100000016","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>Accurate measurement of leaf chlorophyll concentration (LChl) in the field using a portable chlorophyll meter (PCM) is crucial to support methodology development for mapping the spatiotemporal variability of crop nitrogen status using remote sensing. Several PCMs have been developed to measure LChl instantaneously and non-destructively in the field, however, their readings are relative quantities that need to be converted into actual LChl values using conversion functions. The aim of this study was to investigate the relationship between actual LChl and PCM readings obtained by three PCMs: SPAD-502, CCM-200, and Dualex-4. Field experiments were conducted in 2016 on four crops: corn (Zea mays L.), soybean (Glycine max L. Merr.), spring wheat (Triticum aestivum L.), and canola (Brassica napus L.), at the Central Experimental Farm of Agriculture and Agri-Food Canada in Ottawa, Ontario, Canada. To evaluate the impact of other factors (leaf internal structure, leaf pigments other than chlorophyll, and the heterogeneity of LChl distribution) on the conversion function, a global sensitivity analysis was conducted using the PROSPECT-D model to simulate PCM readings under different conditions. Results showed that Dualex-4 had a better performance for actual LChl measurement than SPAD-502 and CCM-200, using a general conversion function for all four crops tested. For SPAD-502 and CCM-200, the error in the readings increases with increasing LChl. The sensitivity analysis reveals that deviations from the calibration functions are more induced by non-uniform LChl distribution than leaf architectures. The readings of Dualex-4 can have a better ability to restrict these influences than those of the other two PCMs.<\/jats:p>","DOI":"10.3390\/rs11222706","type":"journal-article","created":{"date-parts":[[2019,11,19]],"date-time":"2019-11-19T11:30:17Z","timestamp":1574163017000},"page":"2706","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":88,"title":["Assessment of Portable Chlorophyll Meters for Measuring Crop Leaf Chlorophyll Concentration"],"prefix":"10.3390","volume":"11","author":[{"given":"Taifeng","family":"Dong","sequence":"first","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Jiali","family":"Shang","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Jing M.","family":"Chen","sequence":"additional","affiliation":[{"name":"Department of Geography and Planning, University of Toronto, Toronto, ON M5S 3G3, Canada"}]},{"given":"Jiangui","family":"Liu","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Budong","family":"Qian","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Baoluo","family":"Ma","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Malcolm J.","family":"Morrison","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Chao","family":"Zhang","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-9871-1905","authenticated-orcid":false,"given":"Yupeng","family":"Liu","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Yichao","family":"Shi","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Hui","family":"Pan","sequence":"additional","affiliation":[{"name":"Ottawa Research and Development Centre, Agriculture and Agri-Food Canada, Ottawa, ON K1A 0C6, Canada"}]},{"given":"Guisheng","family":"Zhou","sequence":"additional","affiliation":[{"name":"College of Agriculture, Yangzhou University, Yangzhou 225009, China"}]}],"member":"1968","published-online":{"date-parts":[[2019,11,19]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"37","DOI":"10.1016\/j.eja.2018.06.008","article-title":"Does remote and proximal optical sensing successfully estimate maize variables? 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