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Plant Science Today (PST)

Research Articles

Vol. 13 No. sp1 (2026): Recent Advances in Agriculture

Assessing urea efficiency in paddy using vegetation indices: A comparative study of super nano urea and conventional urea

DOI
https://doi.org/10.14719/pst.10101
Submitted
17 June 2025
Published
12-01-2026

Abstract

This study evaluates the efficiency of solid and liquid Super Nano Urea (SNU) and conventional urea in rice, focusing on physiological responses, grain quality and vegetation indices. A field experiment during Rabi and Kharif 2024 compared 13 fertilization strategies, including 100 %, 75 % and 50 % of the Recommended Dose of Nitrogen (RDN) using SNU granules, with or without two foliar sprays of 0.7 % liquid SNU at tillering and panicle initiation stages. Parallel treatments used conventional urea at equivalent nitrogen (N) levels, also with and without foliar sprays. A no-fertilizer control was included. Growth parameters such as Plant Height (PH), Leaf Area Index (LAI), Soil Plant Analysis Development (SPAD) values and vegetation indices including Normalized Difference Vegetation Index (NDVI), Normalized Difference Red Edge Index (NDREI), Ratio Vegetation Index (RVI) and Green Normalized Difference Vegetation Index (GNDVI), were recorded. The results showed that foliar application of SNU significantly enhanced Nitrogen Use Efficiency (NUE). For instance, SNU at 100 % RDN + 2 sprays yielded 6318 kg ha-1, versus 6150 kg ha-1 without sprays. Similarly, conventional urea at 100 % + 2 sprays produced the highest yield (6400 kg ha-1), outperforming its no-spray counterpart (6273 kg ha-1). Foliar sprays improved nutrient uptake, panicle traits and Grain Yield (GY). Despite limited distribution and regulatory hurdles for SNU, the results show that combining conventional urea with foliar sprays provides a high-performing, sustainable nitrogen management strategy.

References

  1. 1. Food and Agriculture Organization of the United Nations. World food and agriculture - statistical yearbook 2023. Rome; 2023.
  2. 2. Childs N, LeBeau B, Vaiknoras K. Rice Outlook: January 2024. Washington (DC): U.S. Department of Agriculture, Economic Research Service; 2024
  3. 3. Amanullah, Ullah H. Boosting crop growth rates of hybrid rice (Pukhraj) through synergistic use of organic nitrogen sources in conjunction with urea nitrogen. Nitrogen. 2024;5(1):28-46. https://doi.org/10.3390/nitrogen5010003
  4. 4. Zahoor A, Christy M, Hwang YJ, Lim YR, Kim P, Nahm KS. Improved electrocatalytic activity of carbon materials by nitrogen doping. Appl Catal B Environ. 2014;147:633-41. https://doi.org/10.1016/j.apcatb.2013.09.043
  5. 5. Govindasamy P, Muthusamy SK, Bagavathiannan M, Mowrer J, Jagannadham PTK, Maity A, et al. Nitrogen use efficiency-a key to enhance crop productivity under a changing climate. Front Plant Sci. 2023;14:1121073. https://doi.org/10.3389/fpls.2023.1121073
  6. 6. Yadav D, Shivay Y, Singh Y, Sharma V, Bhatia A. Enhancing nutrient translocation, yields and water productivity of wheat under rice-wheat cropping system through zinc nutrition and residual effect of green manuring. J Plant Nutr. 2020;43(19):2845-56. https://doi.org/10.1080/01904167.2020.1798997
  7. 7. Kumari M, Tomar B, Singh P, Tomar SS, Patle T, Parihar SS. Nanotechnology and agricultural sustainability: environmental impacts and benefits. In: Harnessing nanoOmics and nanozymes for sustainable agriculture. IGI Global; 2024. p. 176-92. https://doi.org/10.4018/979-8-3693-1890-4.ch009
  8. 8. Sapkota TB. India's fertilizer policies: implications for food security, environmental sustainability and climate change. Reg Environ Change. 2025;25(2):1-13. https://doi.org/10.1007/s10113-025-02395-9
  9. 9. Verma KK, Song XP, Degu HD, Guo DJ, Joshi A, Huang HR, et al. Recent advances in nitrogen and nano-nitrogen fertilizers for sustainable crop production: a mini-review. Chem Biol Technol Agric. 2023;10(1):111. https://doi.org/10.1186/s40538-023-00488-3
  10. 10. Abhiram G. Contributions of nano-nitrogen fertilizers to sustainable development goals: a comprehensive review. Nitrogen. 2023;4(4):397-415. https://doi.org/10.3390/nitrogen4040028
  11. 11. Iatrou M, Karydas C, Iatrou G, Pitsiorlas I, Aschonitis V, Raptis I, et al. Topdressing nitrogen demand prediction in rice crop using machine learning systems. Agriculture. 2021;11(4):312. https://doi.org/10.3390/agriculture11040312
  12. 12. Blekanov I, Molin A, Zhang D, Mitrofanov E, Mitrofanova O, Li Y. Monitoring of grain crops nitrogen status from UAV multispectral images coupled with deep learning approaches. Comput Electron Agric. 2023;212:108047. https://doi.org/10.1016/j.compag.2023.108047
  13. 13. Kumar Y, Singh T, Raliya R, Tiwari K. Nano fertilizers for sustainable crop production, higher nutrient use efficiency and enhanced profitability. Indian J Fert. 2021;17(11):1206-14.
  14. 14. Raliya R, Saharan V, Dimkpa C, Biswas P. Nanofertilizer for precision and sustainable agriculture: current state and future perspectives. J Agric Food Chem. 2017;66(26):6487-503. https://doi.org/10.1021/acs.jafc.7b02178
  15. 15. Behboudi F, Tahmasebi Sarvestani Z, Kassaee MZ, Modares Sanavi S, Sorooshzadeh A. Improving growth and yield of wheat under drought stress via application of SiO2 nanoparticles. J Agric Sci Technol 2018;20(7):1479-92.
  16. 16. Al-Juthery H, Hardan H, Al-Swedi FG, Obaid M, Al-Shami Q. Effect of foliar nutrition of nano-fertilizers and amino acids on growth and yield of wheat. In: IOP Conference Series: Earth and Environmental Science; 2019; Bristol, UK: IOP Publishing; 2019. p. 012046. https://doi.org/10.1088/1755-1315/388/1/012046
  17. 17. Du W, Yang J, Peng Q, Liang X, Mao H. Comparison study of zinc nanoparticles and zinc sulphate on wheat growth: from toxicity and zinc biofortification. Chemosphere. 2019;227:109-16. https://doi.org/10.1016/j.chemosphere.2019.03.168
  18. 18. Manikandan A, Subramanian K. Evaluation of zeolite based nitrogen nano-fertilizers on maize growth, yield and quality on inceptisols and alfisols. Int J Plant Soil Sci. 2016;9(4):1-9. https://doi.org/10.9734/IJPSS/2016/22103
  19. 19. Arora S, Sharma P, Kumar S, Nayan R, Khanna P, Zaidi M. Gold-nanoparticle induced enhancement in growth and seed yield of Brassica juncea. Plant Growth Regul 2012;66:303-10. https://doi.org/10.1007/s10725-011-9649-z
  20. 20. Das A, Babu S, Yadav G, Ansari M, Singh R, Baishya L, et al. Status and strategies for pulses production for food and nutritional security in north-eastern region of India. Indian J Agron 2016;61:43-57.
  21. 21. Rathore S, Shekhawat KA, Singh R, Updhyay P, Shekhawat R, Premi O. Effect of nano-particles on growth, productivity, profitability of Indian mustard (Brassica juncea) under semi-arid conditions. Indian J Agric Sci 2019;89:1145-50. https://doi.org/10.56093/ijas.v89i7.91669
  22. 22. Khattak WA, Ullah MW, Manan S, Islam SU, Khattak WA, Ul-Islam M. Emerging applications and future trends of agri-nanotechnology. In: Shahzad R, Fiaz S, Qayyum A, Ul Islam M, Lee IJ, editors. Revolutionizing agriculture: a comprehensive exploration of agri-nanotechnology. Cham: Springer; 2024. p. 429–58. https://doi.org/10.1007/978-3-031-76000-6_19
  23. 23. Mullen A. Expectations from nano in agriculture. Nat Nanotechnol 2019;14(6):515-6. https://doi.org/10.1038/s41565-019-0471-5
  24. 24. Patra K, Parihar CM, Nayak H, Rana B, Sena DR, Anand A, et al. Appraisal of complementarity of subsurface drip fertigation and conservation agriculture for physiological performance and water economy of maize. Agr Water Manage 2023;283:108308. https://doi.org/10.1016/j.agwat.2023.108308
  25. 25. SPSS I. IBM SPSS Statistics for Windows, Version 21.0. Armonk, NY: IBM Corp; 2012.
  26. 26. Damor RI, Desai CK, Desai JS. Enhancing growth and yield of Indian mustard through foliar application of nano urea and nano zinc: a field study. Int J Res Agron. 2024;7(12S):236-8. https://doi.org/10.33545/2618060X.2024.v7.i12Sd.2139
  27. 27. Fageria NK. Nitrogen management in crop production. Boca Raton, FL: CRC Press; 2014 https://doi.org/10.1201/b17101
  28. 28. Boonjung H, Fukai S. Effects of soil water deficit at different growth stages on rice growth and yield under upland conditions. 2. Phenology, biomass production and yield. Field Crops Res. 1996;48(1):47-55. https://doi.org/10.1016/0378-4290(96)00039-1
  29. 29. Zheng Y, Ding YF, Liu ZH, Wang SH. Effects of panicle nitrogen fertilization on non-structural carbohydrate and grain filling in indica rice. Agric Sci China. 2010;9:1630-40. https://doi.org/10.1016/S1671-2927(09)60260-1
  30. 30. Peng S, Garcia FV, Laza RC, Cassman KG. Adjustment for specific leaf weight improves chlorophyll meter's estimate of rice leaf nitrogen concentration. Agron J. 1993;85(5):987-90. https://doi.org/10.2134/agronj1993.00021962008500050005x
  31. 31. Yamori W. Photosynthetic response to fluctuating environments and photoprotective strategies under abiotic stress. J Plant Res 2016;129(3):379-95. https://doi.org/10.1007/s10265-016-0816-1
  32. 32. Gitelson AA, Merzlyak MN. Signature analysis of leaf reflectance spectra: algorithm development for remote sensing of chlorophyll. J Plant Physiol. 1996;148(3-4):494-500. https://doi.org/10.1016/S0176-1617(96)80284-7
  33. 33. Samborski SM, Tremblay N, Fallon E. Strategies to make use of plant sensors-based diagnostic information for nitrogen recommendations. Agron J. 2009;101(4):800-16. https://doi.org/10.2134/agronj2008.0162Rx
  34. 34. Hatfield JL, Gitelson AA, Schepers JS, Walthall CL. Application of spectral remote sensing for agronomic decisions. Agron J 2008;100 Suppl:S117-31. https://doi.org/10.2134/agronj2006.0370c
  35. 35. Dobermann A, Fairhurst T. Rice: nutrient disorders and nutrient management. Los Baños (Philippines): Potash & Phosphate Institute; Potash & Phosphate Institute of Canada; International Rice Research Institute; 2000
  36. 36. Ladha JK, Pathak H, Krupnik TJ, Six J, van Kessel C. Efficiency of fertilizer nitrogen in cereal production: retrospects and prospects. Adv Agron. 2005;87:85-156. https://doi.org/10.1016/S0065-2113(05)87003-8

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