"Field","Observation 1","Observation 2","Interpretation"
"Date, crop, cultivar and stage","","","Same defined leaf population for comparisons"
"Leaf identity or defined position","","","State repeated same leaf or consistent leaf-position method"
"Instrument model and reporting mode","","","Preserve device, mode and original scale"
"Species setting or calibration profile","","","Record actual setting; do not infer applicability"
"Original displayed value and unit/index","","","SPAD, CCI or chlorophyll per area kept distinct"
"Measurement context and leaf condition","","","Record relevant observations with photo reference"
"Optical signal to named index","","","Evidence: manufacturer measurement and reporting description"
"Index to chlorophyll estimate","","","Evidence: applicable species/range calibration, if this inference is made"
"Chlorophyll to crop nitrogen interpretation","","","Evidence: separate crop-specific support; no automatic conversion"
"Crop observations and adviser interpretation","","","Do not diagnose yellowing from index alone"
"Comparability conclusion","","","Same scale/context supported or separate series/unresolved"
"Management question and next evidence","","","No fertilizer dose supplied; record the decision the adviser must address"
"Use","MANUAL, no formulas. Import UTF-8 comma CSV, widen columns and wrap text. Use one column per observation. Add observation columns only with comparable definitions. Preserve original readings and evidence at each inference step; save a working copy.","","MANUAL; no formulas or automatic approval"
"Source context","https://www.konicaminolta.com/instruments/download/catalog/color/pdf/spad502plus_catalog_eng.pdf ; https://www.apogeeinstruments.com/chlorophyll-meter-faqs/ ; https://www.apogeeinstruments.com/chlorophyll-meter-support/ ; https://www.frontiersin.org/journals/plant-science/articles/10.3389/fpls.2018.01752/full","","Source interpretation and limits are explained in the accompanying article."