02588naa a2200265 a 450000100080000000500110000800800410001902200140006002400350007410000160010924501100012526000090023550008780024452008990112265300090202165300240203065300180205465300240207265300380209670000210213470000200215570000200217570000240219577301030221910651602025-04-09       2025    bl uuuu     u00u1 u    #d  a0378-42907 a10.1016/j.fcr.2025.1098242DOI1 aMALTESE, N.  aGreenness index profile in maize canopybImplications for crop N status diagnosis.h[electronic resource]  c2025  aArticle history: Received 16 October 2024, Revised 18 February 2025, Accepted 22 February 2025, Available online 27 February 2025, Version of Record 27 February 2025. -- Correspondence: Maltese, N.E.; Instituto Nacional de Investigación Agropecuaria (INIA), Estación Experimental ?Dr. Alberto Boerger?, Ruta 50, km 11, Colonia, Uruguay; email:nmaltese@inia.org.uy ; Reussi Calvo, N.I.; Facultad de Ciencias Agrarias, Universidad Nacional de Mar del Plata, Ruta 226 km 73.5, Balcarce, Buenos Aires, Argentina; email:reussicalvo.nahuel@inta.gob.ar  -- Funding: Partial funding for this work was provided by ANPCyT (PICT-2020- SERIEA-01122; PICT-2020-SERIEA-00605), UNMdP (AGR704/23) and INTA (2023-PE-L01-I012). -- Supplementary information: Supplementary data associated with this article can be found in the online version at: https://doi.org/10.1016/j.fcr.2025.109824 --  aABSTRACT.- Context: The greenness index of the ear-leaf in maize (Zea mays L.) has been used to assess crop nitrogen (N) status, but it may not accurately predict yield responses to late N fertilization. Objective: This study aimed to i) analyze differences in the greenness index and N sufficiency index (NSI) across maize canopy leaf positions and their relationship with soil N availability, N nutrition index (NNI), and grain yield, and ii) evaluate the accuracy of NSI determined in different leaf positions in predicting the grain yield response to N fertilization at silking. Methods: The greenness index was measured across the maize canopy profile under varying N rates and application timings in five field experiments. Bell-shaped models described the greenness index distribution, and relationships among NSI, NNI, and relative grain yield (rGY) were analyzed. © 2025 Elsevier B.V.  aCorn  aLate N applications  aLeaf position  aN sufficiency index  aSISTEMA AGRÍCOLA-GANADERO - INIA1 aCARCIOCHI, W. D.1 aCAVIGLIA, O. P.1 aIGLESIAS, M. P.1 aREUSSI CALVO, N. I.  tField Crops Research, 15 April 2025, Volume 325, 109824. https://doi.org/10.1016/j.fcr.2025.109824