Agronomic, physiological, and yield responses of Peruvian maize races under Mediterranean conditions: genotypic variation and effects of nitrogen fertilizer type
DOI:
https://doi.org/10.55779/nsb18112862Keywords:
Ear-related traits, grain quality, nitrification and urease inhibitors, Peruvian maize germplasm, physiological parameters, protein contentAbstract
The production of maize (Zea mays L.) in southern Europe is constrained by major limitations owing to Mediterranean climate conditions, and nitrogen (N) fertilizer management has been identified as one of the major issues affecting the sustainability of maize production. A field experiment was conducted over three years in Greece to study the agronomic characteristics, physiological parameters, grain yield, and quality of two Peruvian races of maize (Piscorunto and Pagaladroga) and compare them with a commercial variety (‘Jolly’), under different N fertilizer types. The experiment was conducted in a split plot design with genotypes and N treatments (untreated (control), urea, and urea with urease and nitrification inhibitors (Urea + NI + UI)) as the main and sub-plots, respectively. The results highlighted strong genotypic effects. In particular, the commercial variety ‘Jolly’ possessed the highest values for leaf area index (LAI), soil-plant analysis development (SPAD), normalized difference vegetation index (NDVI) and grain yield across the three growing seasons. The Peruvian races gave the highest values for vigor among the growth characteristics, thousand grain weight, and grain protein content, although their overall grain yield was lower. In addition, the N fertilization significantly improved crop productivity compared with the control, with urea treated with urease and nitrification inhibitors producing the most favorable yield performance. In conclusion, the research showed that the productivity of maize in the Mediterranean climate is significantly affected by the genotype and the type of nitrogen fertilizer used, where the commercial variety of maize ‘Jolly’ showed the best yield, the Peruvian maize showed the best vigor and quality, and the urea fertilizer with nitrification and urease inhibitors was identified as the best fertilizer option to improve yield and quality productivity.
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References
Akmal M, Hameed UR, Farhatullah, Asim M, Akbar H (2010). Response of maize varieties to nitrogen application for leaf area profile, crop growth, yield and yield components. Pakistan Journal of Botany 42:1941-1947.
Anas M, Liao F, Verma KK, Sarwar MA, Mahmood A, Chen ZL, Li Q, Zeng XP, Liu Y, Li YR (2020). Fate of nitrogen in agriculture and environment: agronomic, eco-physiological and molecular approaches to improve nitrogen use efficiency. Biological Research 53:47. https://doi.org/10.1186/s40659-020-00312-4
Asibi AE, Chai QA, Coulter J (2019). Mechanisms of nitrogen use in maize. Agronomy 9:775. https://doi.org/10.3390/agronomy9120775
Bortoletto-Santos R, Cavigelli MA, Montes SE, Schomberg HH, Le A, Thompson AI, Kramer M, Polito WL, Ribeiro C (2020). Oil-based polyurethane-coated urea reduces nitrous oxide emissions in a corn field in a Maryland loamy sand soil. Journal of Cleaner Production 249:119329. https://doi.org/10.1016/j.jclepro.2019.119329.
Brewer K, Clulow A, Sibanda M, Gokool S, Naiken V, Mabhaudhi T (2022). Predicting the chlorophyll content of maize over phenotyping as a proxy for crop health in smallholder farming systems. Remote Sensing 14:518. https://doi.org/10.3390/rs14030518
Ceballos A, Martı́nez-Fernández J, Luengo-Ugidos MÁ (2004). Analysis of rainfall trends and dry periods on a pluviometric gradient representative of Mediterranean climate in the Duero Basin, Spain. Journal of Arid Environments 58:215-233. https://doi.org/10.1016/j.jaridenv.2003.07.002
Chen Y, Xiao C, Chen X, Li Q, Zhang J, Chen F, Yuan L, Mi G (2014). Characterization of the plant traits contributed to high grain yield and high grain nitrogen concentration in maize. Field Crops Research 159:1-9. https://doi.org/10.1016/j.fcr.2014.01.002
Ciampitti IA, Vyn TJ (2012). Physiological perspectives of changes over time in maize yield dependency on nitrogen uptake and associated nitrogen efficiencies: A review. Field Crops Research 133:48-67. https://doi.org/10.1016/j.fcr.2012.03.008
Delibaltova V (2014). Response of maize hybrids to different nitrogen applications under climatic conditions of Plovdiv region. International Journal of Farming and Allied Sciences 3:408-412.
Di Paolo E, Rinaldi M (2008). Yield response of corn to irrigation and nitrogen fertilization in a Mediterranean environment. Field Crops Research 105:202-210. https://doi.org/10.1016/j.fcr.2007.10.004
Edalat M, Naderi R, Egan TP (2019). Corn nitrogen management using NDVI and SPAD sensor-based data under conventional vs. reduced tillage systems. Journal of Plant Nutrition 42:2310-2322. https://doi.org/10.1080/01904167.2019.1648686
El-Sanatawy AM, El-Kholy ASM, Ali MMA, Awad MF, Mansour E (2021). Maize seedling establishment, grain yield and crop water productivity response to seed priming and irrigation management in a Mediterranean arid environment. Agronomy 11:756. https://doi.org/10.3390/agronomy11040756
Ertiro BT, Das B, Kosgei T, Tesfaye AT, Labuschagne MT, Worku M, Olsen MS, Chaikam V, Gowda M (2022). Relationship between grain yield and quality traits under optimum and low-nitrogen stress environments in tropical maize. Agronomy 12:438. https://doi.org/10.3390/agronomy12020438
Fuentes-Cardenas IS, Cuba-Puma R, Marcilla-Truyenque S, Begazo-Gutiérrez H, Zolla G, Fuentealba C, Shetty K, Ranilla LG (2022). Diversity of the Peruvian Andean maize (Zea mays L.) race Cabanita: polyphenols, carotenoids, in vitro antioxidant capacity, and physical characteristics. Frontiers in Nutrition 9:983208. https://doi.org/10.3389/fnut.2022.983208
Gage JL, Jarquin D, Romay C, Lorenz A, Buckler ES, Kaeppler S, … de Leon N (2017). The effect of artificial selection on phenotypic plasticity in maize. Nature Communications 8:1348. https://doi.org/10.1038/s41467-017-01450-2
Gambin BL, Di Salvo JI, Sciarresi C, Trifunovic S, Narvel J, Zhou X, Lamkey K, Archontoulis SV (2023). Maize kernel weight genetic gain is achieved through different mechanisms depending on the hybrid maturity. Field Crops Research 303:109123. https://doi.org/10.1016/j.fcr.2023.109123
Garcia G, Montero F, Torres ME, Alvarez S, Vasquez W, Villantoy A, … Matsusaka D (2026). Adaptability, yield stability, and agronomic performance of improved purple corn (Zea mays L.) hybrids across diverse agro-ecological zones in Peru. International Journal of Plant Biology 17:3. https://doi.org/10.3390/ijpb17010003
Gheith EMS, El-Badry OZ, Lamlom SF, Ali HM, Siddiqui MH, Ghareeb RY, El-Sheikh MH, Jebril J, Abdelsalam NR, Kandil EE (2022). Maize (Zea mays L.) productivity and nitrogen use efficiency in response to nitrogen application levels and time. Frontiers in Plant Science 13:941343. https://doi.org/10.3389/fpls.2022.941343
Govindasamy P, Muthusamy SK, Bagavathiannan M, Mowrer J, Jagannadham PTK, Maity A, … Tiwari G (2023). Nitrogen use efficiency-a key to enhance crop productivity under a changing climate. Frontiers in Plant Science 14:1121073. https://doi.org/10.3389/fpls.2023.1121073
Greek Ministry of Rural Development and Food (2025). National plant variety catalogue (in Greek). Retrieved 2025 December 9 from https://www.minagric.gr/for-farmer-2/crop-production/polylikomenu/549-nomothesia-polyliko/553-cat-poik-polyliko/3047-enthnikoi-katalogoi-poikilion
Grobman A, Salhuana W, Sevilla R, Mangelsdorf PC (1961). Races of maize in Peru. National Academies of Sciences, NRC, Washington D.C. Retrieved 2025 December 11 from https://www.ars.usda.gov/ARSUserFiles/50301000/Races_of_Maize/RoM_Peru_0_Book.pdf
Guo A, Ren H, Yang H, Liang Z, Li Y, Dou T, Ma Y, Shen H (2026). Physiological and molecular mechanisms of nitrogen regulation on grain quality in cereal crops at later stages. International Journal of Molecular Sciences 27(5):2125. https://doi.org/10.3390/ijms27052125
Gupta S, Yildirim S, Andrikopoulos B, Wille U, Roessner U (2023). Deciphering the interactions in the root–soil nexus caused by urease and nitrification inhibitors: A review. Agronomy 13:1603. https://doi.org/10.3390/agronomy13061603
Guzzon F. Arandia Rios LW. Caviedes Cepeda GM. Céspedes Polo M. Chavez Cabrera A. … Pixley KV (2021). Conservation and use of Latin American maize diversity: Pillar of nutrition security and cultural heritage of humanity. Agronomy 11:172. https://doi.org/10.3390/agronomy11010172
Hnizil O, Baidani A, Khlila I, Nsarellah N, Amamou A (2024). Assessing the impact of nitrogen fertilization, variety selection, year and their interaction on wheat yield and yield components. Nitrogen 5:266-287. https://doi.org/10.3390/nitrogen5020018
IUSS Working Group WRB (2022). World Reference Base for Soil Resources. International Soil Classification System for Naming Soils and Creating Legends for Soil Maps. International Union of Soil Sciences (IUSS) (4th ed.), Vienna, Austria.
Janzen GM, Aguilar-Rangel MR, Cíntora-Martínez C, Blöcher-Juárez KA, González-Segovia E, Studer AJ, … Hufford MB (2022). Demonstration of local adaptation in maize landraces by reciprocal transplantation. Evolutionary Applications 15:817-837. https://doi.org/10.1111/eva.13372
Kakabouki I, Roussis I, Krokida M, Mavroeidis A, Stavropoulos P, Karydogianni S, Beslemes D, Tigka E (2024). Comparative study effect of different urea fertilizers and tomato pomace composts on the performance and quality traits of processing tomato (Lycopersicon esculentum Mill.). Plants 13:1852. https://doi.org/10.3390/plants13131852
Kakabouki I, Roussis I, Mavroeidis A, Stavropoulos P, Kanatas P, Pantaleon K, Folina A, Beslemes D, Tigka E (2025). Effects of zeolite application and inorganic nitrogen fertilization on growth, productivity, and nitrogen and water use efficiency of maize (Zea mays L.) cultivated under Mediterranean conditions. Sustainability 17:2178. https://doi.org/10.3390/su17052178
Karaca C, Peña-Fleitas MT, Rodríguez A, Gallardo M, Thompson RB, Padilla FM (2025). Comparison of vegetation indices measured with proximal reflectance sensing to assess leaf N content and estimate crop yield in vegetable crops. Smart Agricultural Technology 12:101369. https://doi.org/10.1016/j.atech.2025.101369
Kizilgeci F, Yildirim M, Islam MS, Ratnasekera D, Iqbal MA, Sabagh AE (2021). Normalized difference vegetation index and chlorophyll content for precision nitrogen management in durum wheat cultivars under semi-arid conditions. Sustainability 13:3725. https://doi.org/10.3390/su13073725
Knobler S, Rilov G, Garfinkel CI, Liberzon D (2025). Climate change impacts in Eastern Mediterranean Sea: Trends and extremes. Water Waves 7:521-556. https://doi.org/10.1007/s42286-025-00118-5
Koukouli P, Georgiou P, Karpouzos D (2025). Assessment of the impacts of climate change scenarios on maize yield and irrigation water using the CropSyst model: An application in Northern Greece. Agronomy 15:638. https://doi.org/10.3390/agronomy15030638
Li X, Zhang X, Wang S, Hou W, Yan L (2023). The combined use of liquid fertilizer and urease/nitrification inhibitors on maize yield, nitrogen loss and utilization in the Mollisol region. Plants 12:1486. https://doi.org/10.3390/plants12071486
Li Y, Song H, Zhou L, Xu Z, Zhou G (2019). Vertical distributions of chlorophyll and nitrogen and their associations with photosynthesis under drought and rewatering regimes in a maize field. Agricultural and Forest Meteorology 272-273:40-54. https://doi.org/10.1016/j.agrformet.2019.03.026
Lionello P, Malanotte-Rizzoli P, Boscolo R, Alpert P, Artale V, Li L, Luterbacher J, May W, Trigo R, Tsimplis M, Ulbrich U, Xoplaki E (2006). The Mediterranean climate: An overview of the main characteristics and issues. Developments in Earth and Environmental Sciences 4:1-26. https://doi.org/10.1016/s1571-9197(06)80003-0
Liu G, Yang Y, Guo X, Liu W, Xie R, Ming B, Xue J, Wang K, Li S. Hou P (2022). Coordinating maize source and sink relationship to achieve yield potential of 22.5 Mg ha-1. Field Crops Research 283:108544. https://doi.org/10.1016/j.fcr.2022.108544
Mandić V, Đorđević S, Brankov M, Živković V, Lazarević M, Keškić T, Krnjaja V (2024). Response of yield formation of maize hybrids to different planting densities. Agriculture 14:351. https://doi.org/10.3390/agriculture14030351
Mandić V, Krnjaja V, Girek Z, Brankov M, Mićić N, Marinković M, Simić A (2025). Nitrogen responsiveness of maize hybrids under dryland conditions. Agriculture 15:1387. https://doi.org/10.3390/agriculture15131387
Mariano E, de Sant Ana Filho CR, Bortoletto-Santos R, Bendassolli JA, Trivelin PCO (2019). Ammonia losses following surface application of enhanced-efficiency nitrogen fertilizers and urea. Atmospheric Environment 203:242-251. https://doi.org/10.1016/j.atmosenv.2019.02.003
Marković M, Josipović M, Šoštarić J, Jambrović A, Brkić A (2017). Response of maize (Zea mays L.) grain yield and yield components to irrigation and nitrogen fertilization. Journal of Central European Agriculture 18:55-72. https://doi.org/10.5513/JCEA01/18.1.1867
Martre P, Porter JR, Jamieson PD, Triboï E (2003). Modeling grain nitrogen accumulation and protein composition to understand the sink/source regulations of nitrogen remobilization for wheat. Plant Physiology 133:1959-1967. https://doi.org/10.1104/pp.103.030585
Moradi L, Siosemardeh A, Sohrabi Y, Bahramnejad B, Hosseinpanahi F (2022). Dry matter remobilization and associated traits, grain yield stability, N utilization, and grain protein concentration in wheat cultivars under supplemental irrigation. Agricultural Water Management 263:107449. https://doi.org/10.1016/j.agwat.2021.107449
Nyandi MS, Appiah EA, Pepó P (2025): Harnessing chlorophyll and canopy reflectance indices relationship for grain yield, protein and starch content in maize cultivars under different nitrogen treatments. Plant Soil and Environment 71:525-533. https://doi.org/10.17221/633/2024-pse
Oishy MN, Shemonty NA, Fatema SI, Mahbub S, Mim EL, Hasan Raisa MB, Anik AH (2025). Unravelling the effects of climate change on the soil-plant-atmosphere interactions: A critical review. Soil & Environmental Health 3:100130. https://doi.org/10.1016/j.seh.2025.100130
Ortiz R, Crossa J, Franco J, Sevilla R, Burgueño J (2007). Classification of Peruvian highland maize races using plant traits. Genetic Resources and Crop Evolution 55:151-162. https://doi.org/10.1007/s10722-007-9224-7
Papakosta DK, Gagianas AA (1991). Nitrogen and dry matter accumulation, remobilization, and losses for Mediterranean wheat during grain filling. Agronomy Journal 83:864-870. https://doi.org/10.2134/agronj1991.00021962008300050018x
Popa C, Călugăr RE, Varga A, Muntean E, Băcilă I, Vana CD, … Muntean L (2025). Evaluating maize hybrids for yield, stress tolerance, and carotenoid content: Insights into breeding for climate resilience. Plants 14:138. https://doi.org/10.3390/plants14010138
Quintero A, Molero G, Reynolds MP, Calderini DF (2018). Trade-off between grain weight and grain number in wheat depends on GxE interaction: A case study of an elite CIMMYT panel (CIMCOG). European Journal of Agronomy 92:17-29. https://doi.org/10.1016/j.eja.2017.09.007
Revilla P, Alves ML, Andelković V, Balconi C, Dinis I, Mendes-Moreira P, Redaelli R, Ruiz de Galarreta JI, Vaz Patto MC, Žilić S, Malvar RA (2022). Traditional foods from maize (Zea mays L.) in Europe. Frontiers in Nutrition 8:683399. https://doi.org/10.3389/fnut.2021.683399
Ruser R, Flessa H, Russow R, Schmidt G, Buegger F, Munch JC (2006). Emission of N2O, N2 and CO2 from soil fertilized with nitrate: effect of compaction, soil moisture and rewetting. Soil Biology and Biochemistry 38:263-274. https://doi.org/10.1016/j.soilbio.2005.05.005
Saenz E, Trifunovic S, Narvel J, Vyn T, Archontoulis SV (2025). Maize breeding strategies for increased grain yield and nitrogen use efficiency. Field Crops Research 333:110076. https://doi.org/10.1016/j.fcr.2025.110076
Saitoh K, Yonetani K, Murota T, Kuroda T (2002). Effects of flag leaves and panicles on light interception and canopy photosynthesis in high-yielding rice cultivars. Plant Production Science 5:275-280. https://doi.org/10.1626/pps.5.275
Salhuana W (2004). Diversity and description of maize varieties in Peru. Cooperative Maize Research Program (in Spanish). National Agrarian University La Molina. Retrieved 2025 December 11 from https://www.ars.usda.gov/ARSUserFiles/50301000/Races_of_Maize/Diversidad%20y%20razas%20de%20maiz%20en%20Peru.pdf
Salvador-Reyes R, Clerici MTPS (2020). Peruvian Andean maize: General characteristics, nutritional properties, bioactive compounds, and culinary uses. Food Research International 130:108934. https://doi.org/10.1016/j.foodres.2019.108934
Salvador-Reyes R, Rebellato AP, Lima Pallone JA, Ferrari RA, Clerici MTPS (2021). Kernel characterization and starch morphology in five varieties of Peruvian Andean maize. Food Research International 140:110044. https://doi.org/10.1016/j.foodres.2020.110044
Sanaullah, Khan QU, Ullah R, Arsalan M, Latif A, Khan M, … Shah H (2025). Response of maize to tillage operations and nitrogen levels grown under clay loam soil. Pure and Applied Biology 14:1022-1032. https://doi.org/10.19045/bspab.2025.140094
Seager R, Osborn TJ, Kushnir Y, Simpson IR, Nakamura J, Liu H (2019). Climate variability and change of Mediterranean-type climates. Journal of Climate 32:2887-2915. https://doi.org/10.1175/JCLI-D-18-0472.1
Sharma S, Kumar T, Foulkes MJ, Orford S, Singh AM, Wingen LU, … Pandey R (2023). Nitrogen uptake and remobilization from pre- and post-anthesis stages contribute towards grain yield and grain protein concentration in wheat grown in limited nitrogen conditions. CABI Agriculture and Bioscience 4:12. https://doi.org/10.1186/s43170-023-00153-7
Shojaei SH, Bihamta MR, Mousavi SMN, Qasemi SH, Keshavarzi MHB, Omrani A (2024). Application of graphical analysis and principal components to identify the effect of genotype × trait in maize hybrids. Agrosystems, Geosciences & Environment 7:e20548. https://doi.org/10.1002/agg2.20548
Smith MR, Rao IM, Merchant A (2018). Source-sink relationships in crop plants and their influence on yield development and nutritional quality. Frontiers in Plant Science 9:1889. https://doi.org/10.3389/fpls.2018.01889
Song K, Hong S, Shim S (2025). Responses of photosynthetic activity in flag leaves and spikes as well as seed development of wheat (Triticum aestivum L.) to artificial shading. Agronomy 15:2577. https://doi.org/10.3390/agronomy15112577
Stewart DW, Costa C, Dwyer LM, Smith DL, Hamilton RI, Ma BL (2003). Canopy structure, light interception, and photosynthesis in maize. Agronomy Journal 95:1465-1474. https://doi.org/10.2134/agronj2003.1465
Su Y, Lauerwald R, Makowski D, Viovy N, Guilpart N, Zhu P, Gabrielle B, Ciais P (2025). Future warming increases the chance of success of maize-wheat double cropping in Europe. European Journal of Agronomy 170:127723. https://doi.org/10.1016/j.eja.2025.127723
Szulc P, Ambroży-Deręgowska K, Mejza I, Kobus-Cisowska J, Ligaj M (2020). The role of agrotechnical factors in shaping the protein yield of maize (Zea mays L.). Sustainability 12:6833. https://doi.org/10.3390/su12176833
Vicentin L, Canales J, Calderini DF (2024). The trade-off between grain weight and grain number in wheat is explained by the overlapping of the key phases determining these major yield components. Frontiers in Plant Science 15:1380429. https://doi.org/10.3389/fpls.2024.1380429
Volpi I, Laville P, Bonari E, o di Nasso NN, Bosco S (2017). Improving the management of mineral fertilizers for nitrous oxide mitigation: the effect of nitrogen fertilizer type, urease and nitrification inhibitors in two different textured soils. Geoderma 307:181-188. https://doi.org/10.1016/j.geoderma.2017.08.018
Vos J, van der Putten PEL, Birch CJ (2005). Effect of nitrogen supply on leaf appearance, leaf growth, leaf nitrogen economy and photosynthetic capacity in maize (Zea mays L.). Field Crops Research 93:64-73. https://doi.org/10.1016/j.fcr.2004.09.013
Wang X, Ren J, Wu P (2024). Analysis of growth variation in maize leaf area index based on time-series multispectral images and random forest models. Agronomy 14:2688. https://doi.org/10.3390/agronomy14112688
Webb N, Nichol C, Wood J, Potter E (2013). User Manual for the SunScan Canopy Analysis System Type SS1 Version: 2.0. Delta-T Devices Ltd. Retrieved 2025 December 11 from http://www.delta-t.co.uk/wp-content/uploads/2016/10/SS1-SunScan-User-Manual-v2-0.pdf
Webber H, Ewert F, Olesen JE, Müller C, Fronzek S, Ruane AC, … Manceau L (2018). Diverging importance of drought stress for maize and winter wheat in Europe. Nature Communications 9:4249. https://doi.org/10.1038/s41467-018-06525-2
Xing N, Huang W, Ye H, Ren Y, Xie Q (2021). Joint retrieval of winter wheat leaf area index and canopy chlorophyll density using hyperspectral vegetation indices. Remote Sensing 13:3175. https://doi.org/10.3390/rs13163175
Yasin M, Ahmad A, Khaliq T, Habib-ur-Rahman M, Niaz T, Gaiser T, Ghafoor I, Hassan H, Qasim M, Hoogenboom G (2022). Climate change impact uncertainty assessment and adaptations for sustainable maize production using multi-crop and climate models. Environmental Science and Pollution Research 29:18967-18988. https://doi.org/10.1007/s11356-021-17050-z
Zainuddin B, Syam’un E, Azrai M, Musa Y (2025). Prediction of normalized difference vegetation index and SPAD chlorophyll under high maize population density. BIO Web of Conferences 158:03001. https://doi.org/10.1051/bioconf/202515803001
Zhang L, Liang Z, He X, Meng Q, Hu Y, Schmidhalter U, Zhang W, Zou C, Chen X (2020). Improving grain yield and protein concentration of maize (Zea mays L.) simultaneously by appropriate hybrid selection and nitrogen management. Field Crops Research 249:107754. https://doi.org/10.1016/j.fcr.2020.107754
Zhang L, Wu Z, Jiang Y (2010). Fate of applied urea 15N in a soil-maize system as affected by urease inhibitor and nitrification inhibitor. Plant, Soil and Environment 56:8-15. https://doi.org/10.17221/129/2009-PSE
Zsebő S, Bede L, Kukorelli G, Kulmány IM, Milics G, Stencinger D, Teschner G, Varga Z, Vona V, Kovács AJ (2024). Yield prediction using NDVI values from GreenSeeker and MicaSense cameras at different stages of winter wheat phenology. Drones 8:88. https://doi.org/10.3390/drones8030088
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Copyright (c) 2026 Zoi TSELIA, Ioannis ROUSSIS, Ioanna KAKABOUKI, Stella KARYDOGIANNI, Panteleimon STAVROPOULOS, Antonios MAVROEIDIS, Myrto CHATZITRIANTAFYLLOU, Stavroula KALLERGI, Dimitrios BILALIS
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