Onion (Allium cepa L.) is one of the important vegetables in Egypt. The study was conducted in the vegetable field to study the effect of different rates of phosphorus fertilizers and foliar application of Nano-Boron, Chitosan, and Naphthalene Acidic Acid (NAA) on growth and seed productivity of Onion plant (Allium cepa L., cv. Giza 6 Mohassan). The experiments were carried out in a split-plot design with three replicates. The main plot contains 3 rates of phosphorus treatments (30, 45 and 60 kg P₂O₅/feddan), Subplot includes foliar application of Nano-Boron, Nano-Chitosan and Naphthalene Acidic Acid (NAA) at a concentration of 50 ppm for each and sprayed at three times (50, 65 and 80 days after transplanting). Increasing the phosphorus fertilizers rate to 60 kg P₂O₅/fed significantly affects the growth and seed production of the Onion plant. Foliar application of nano-boron at 50 ppm concentration gave maximum values of onion seed yield in both seasons. Results stated that the correlation between yield and yield contributing characters over two years was highly significant. It could be recommended that P application at a rate of 60 kg P₂O₅ and sprayed onion plants at 50 ppm nano-boron three times (at 50, 65, and 80 days from transplanting) gave the highest seed yield of onion plants. Moreover, the maximum increments of inflorescence diameter (94.4%) were recorded to nano-boron foliar spray (60 p × nB) compared to the other treatments in both seasons.

Abdelkader, M. F. M., Mahmoud, M. H., Abdein, M. A., et al. (2022). The Effect of Combining Post-Harvest Calcium Nanoparticles with a Salicylic Acid Treatment on Cucumber Tissue Breakdown via Enzyme Activity during Shelf Life. Molecules, 27(12), 3687. https://doi.org/10.3390/molecules27123687

Ahmed, I. H., Abdalla, A. A. (1984). Nitrogen and phosphorus fertilization in relation to seed production in onion Allium cepa L., Acta Horticulturae, VIII African Symposium on Horticultural Crops, 143, 119-126. https://doi.org/10.17660/ActaHortic.1984.143.11

Ahmed, M. E. M., Ragab, M.E., Al-Araby, A.A., et al. (2019). Effect of nano particles of chitosan, calcium and copper on growth, yield quality and storability of onion (Allium cepa L.). Available online: https://www.fayoum.edu.eg/Agri/conference3/pdf/Researches/E/37.pdf (accessed on 6 January 2024).

Aisha, A. H., Rizk, F. A., Shaheen, A. M., et al. (2007). Onion plant growth, bulbs yield and its physical and chemical properties as affected by organic and natural fertilization. Journal of Agriculture and Biological Sciences, 3(5), 380-388.

Ali, M. K., Alam, M. F., Alam, M. N., et al. (2007). Effect of nitrogen and potassium level on yield and quality seed production of onion. Journal of Applied Science and Research, 3(12), 1889-1899.

Alkharpotly, A., El-Ghamry, A. M., El-Sherpiny, M. A., et al. (2023). Evaluation of Cobalt Application Combined with Gypsum and Compost as a Regulator of Cabbage Plant Tolerance to Soil Salinity. Open Journal of Ecology, 13(12), 914–930. https://doi.org/10.4236/oje.2023.1312056

Alkharpotly, A., El-Ghamry, A. M., El-Sherpiny, M. A., et al. (2023). Zeolite Amendment for Enhanced Onion Growth with Reduced Mineral Nitrogen Fertilization: A Promising Approach. Ecology, Environment and Conservation, 29(4), 1479–1489. https://doi.org/10.53550/eec.2023.v29i04.003

Almading, M., Al-Thabt, S., Hmaiel, A. F. (2000). Effect of different application rate of two compound fertilizers on growth yield and yield minerals composition of onion (Allium cepa L.) Egypt journal of Applied Sciences, 15(10), 10-15.

Amare, G., Mohammed, W., Tana, T. (2020). Effect of Plant Spacing and Np Fertilizer Levels on Growth, Seed Yield and Quality of Onion (Allium cepa L.) at Shewa Robit, Northern Ethiopia. The Open Biotechnology Journal, 14(1), 12–22. https://doi.org/10.2174/1874070702014010012

Amjad, M., Anjum, M. A., Malik, H. (1999). Effect of Nitrogen and Phosphorus on Seed Production of Three Onion (AIlium cepa L.) Cultivars. Pakistan Journal of Biological Sciences, 2(3), 752-754.

Bayar, J., Shah, S., Khan, W., et al. (2024). Boron Foliar Application Improves Growth, Yield and Grain Quality of Maize. Polish Journal of Environmental Studies, 33(3), 3079-3089. https://doi.org/10.15244/pjoes/177183

Bista, D., Sapkota, D., Paudel, H., et al. (2022). Effect of Foliar Application of Growth Regulators on Growth and Yield of Onion (Allium cepa). International Journal of Horticultural Science and Technology, 9(2). https://doi.org/10.22059/ijhst.2021.321019.451

Blevins, D. G., Lukaszewski, K. M. (1998). Boron in plant structure and function. Annu. Rev. Plant Mol. Biol., 49, 481-500.

Brady, N. C., Weil, R. R. (2002). The nature and properties of soils, 3rd ed. Pearson.

Brawas, I. D., Mukherge, S. K. (1993). Text book of soil science, 5th ed. Tatamal Graw Hall.

Devi, J., Rupinder, S., Walia, I. (2018). Effect of foliar application of GA3 and NAA on onion—A review. Plant Archives, 18(2), 1209-1214.

El-Bassiony, A. M., Mahmoud, S. H., El-Sawy, S. M., et al. (2020). Stimulation of Growth and Productivity of Onion Plants by Selenium and Growth Active Substances. Middle East Journal of Agriculture Research, 9(3).

El-Ezz, S. F. A., A., L. A., Al-Harbi, N. A., et al. (2022). A Comparison of the Effects of Several Foliar Forms of Magnesium Fertilization on ‘Superior Seedless’ (Vitis vinifera L.) in Saline Soils. Coatings, 12(2), 201. https://doi.org/10.3390/coatings12020201

El-Khafagy, A. M. H., Al-Gaboury, K. D. H., Ahmed, S. O. M. (2013). The effect of spraying boron and kinetin in productivity and quality of seeds of Onion plant. Al-Furat Journal of Agricultural Sciences, 5(4), 555-563.

Food and Agriculture Organization of the United Nation. (2023). Food and Agriculture Statistics. Available online: https://www.fao.org/food-agriculture-statistics/en/ (accessed on 16 January 2024).

Gebeyehu, B. (2018). Effect of nitrogen and phosphorous application on seed yield and nutrient uptake of onion (Allium cepa L.). International Journal of Research in Agronomy, 1(2), 38-41.

Geries, L. S., Omnia, M. A., Hashemb, S. M., et al. (2020). Soaking and foliar application with chitosan and nano-chitosan to enhancing growth, productivity and quality of onion crop. Plant Archives, 20(2), 3584-3591.

Golparvar, A. R., Ghasemi-Pirbalouti, A., Madani, H. (2006). Genetic Control of Some Physiological Attributes in Wheat under Drought Stress Conditions. Pakistan Journal of Biological Sciences, 9(8), 1442–1446. https://doi.org/10.3923/pjbs.2006.1442.1446

Gomez, K. A., Gomez, A. A. (1984). Statistical procedures for Agricultural Research, 2nd ed. John Willey and sons.

Herrea-Radriguez, M. B., Gonzalez-Fontes, A., Raxach, J., et al. (2010). Role of boron in vascular plant and response mechanisms to boron stress. Plant Stress, 4(2), 115-122.

Hopkins, B. G., Jolley, V. D., Webb, B. L., et al. (2007). Boron fertilization in Potato. In Western Nutrient Management Conference, 7, 215-218.

Khalil, H. A., Abdelkader, M. F. M., Lo’ay, A. A., et al. (2022). The Combined Effect of Hot Water Treatment and Chitosan Coating on Mango (Mangifera indica L. cv. Kent) Fruits to Control Postharvest Deterioration and Increase Fruit Quality. Coatings, 12(1), 83. https://doi.org/10.3390/coatings12010083

Klute, A. (1986). Methods of soil analysis. Part 1: Physical and mineralogical methods, 2nd ed. American Society of Agronomy, Madison, Wisconsin, USA.

Lal, R. (2008). Promise and limitations of soils to minimize climate change. Journal of Soil and Water Conservation, 63(4), 113A-118A. https://doi.org/10.2489/jswc.63.4.113a

Leilah, A. A., & Al-Khateeb, S. A. (2005). Statistical analysis of wheat yield under drought conditions. Journal of Arid Environments, 61(3), 483–496. https://doi.org/10.1016/j.jaridenv.2004.10.011.

Marey, R. & Elmasry, H. (2024). Vegetative Growth, Yield, and Quality of Onion as Influenced by Nitrogen Rates and Natural Stimulators. Egyptian Journal of Soil Science, 64(1), 0–0. https://doi.org/10.21608/ejss.2023.229168.1638

Moosapoor, N., Sadeghi, S. M., Bidarigh, S. (2013). Effect of boron nano fertilizer and chelated iron on the yield of peanut provinceguilan. Indian Journal of Fundamental and Applied Life Sciences, 3(4), 45-62.

Page, A. L. (1982). Methods of soil analysis. Part 2: Chemical and microbiological properties, 2nd ed. American Society of Agronomy, Madison, Wisconsin, USA.

Pradhan A. M., Nanadeshwar, B. C., Sarkar, K. K., et al. (2011). Estimation of genetic parameters and association of traits related to yield in potato (Solanum tuberosum L.). J. Crop and Weed, 7(2), 229-231.

Schwab, F., Zhai, G., Kern, M., et al. (2015). Barriers, pathways, and processes for uptake, translocation, and accumulation of nanomaterials in plants-Critical review. J. Nanotoxicology, 257–278.

Shaheen, A. M., Rageb, M. E., Fatma A., et al. (2017). Amelioration of Onion Seed Production via Bulb Size and Growth Active Substances. Middle East Journal of Agriculture Research, 6(4).

Shkolnik, M. Y. (1984). Trace Elements in Plants. Available online: https://shop.elsevier.com/books/trace-elements-in-plants/shkolnik/978-0-444-42320-7 (accessed on 16 January 2024).

Singh, A., Singh, R. A., Yadav, D. (2013). Studies on boron use in nutrients deficient area for enhancing the tubers yield of potato. Asian journal of Agricultural and Horticultural Research, 8(1), 381-382.

Singh, R. B., Singh, D. P., Dabbas, M. R. (2010). Effects of nitrogen, phosphorus and potash on growth yield and quality of onion (Allium cepa L.) raised from onion sets. Asian Sciences, 5(1), 49-52

Tewodros, T. N., Asfaw, A., Getachew, T., et al. (2015). Evaluation of Faba bean (Vicia faba L.) varieties against chocolate spot (Botrytis fabae) in North Gondar, Ethiopia. African Journal of Agricultural Research, 10(30), 2984–2988. https://doi.org/10.5897/ajar2014.9344

Zayed, M., Elkafafi, S., Zedan, A., et al. (2017). Effect of Nano Chitosan on Growth, Physiological and Biochemical Parameters of Phaseolus vulgaris under Salt Stress. Journal of Plant Production, 8(5), 577–585. https://doi.org/10.21608/jpp.2017.40468