1. Soliman, D.M., A.M.A. Ahmed and I.M. El-Sayed, 2021. Lead toxicity and spermine as affecting the chemical composition and growth of Solidago canadensis L. cv. ʽtaraʼ plant. Egypt. J. Chem., 10.21608/ejchem.2021.86419.4242.
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2. Khalid, K.A., O.M. Darwesh and A.M.A. Ahmed, 2021. Peel essential oils of citrus types and their antimicrobial activities in response to various growth locations. J. Essent. Oil Bear. Plants, 24: 480-499.
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3. Khalid, K.A., 2021. Changes in lime essential oils and their constituents due to environmental variations at agrarian locations. J. Essent. Oil Bear. Plants, 24: 897-909.
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4. Khalid, K.A. and A.M.A. Ahmed, 2021. Effect of soil type on grapefruit and shaddock essential oils. J. Soil Sci. Plant Nutr., 21: 2048-2056.
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5. Khalid, K.A. and A.M.A. Ahmed, 2021. Effect of reclaimed cultivation regions on the leaf, flower and peel essential oils of dancy tangerine. J. Essent. Oil Bear. Plants, 24: 925-936.
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6. Khalid, K.A., A.M.A. Ahmed and A.E. El-Gohary, 2020. Effect of growing seasons on the leaf essential oil composition of Citrus species that are cultivated in Egypt. J. Essent. Oil Res., 32: 296-307.
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7. Khalid, K.A., A.E. El-Gohary and A.M.A. Ahmed, 2020. Raising the efficiency of lemon trees to produce essential oil by exogenous cysteine under various soil structures. J. Essent. Oil Bear. Plants, 23: 194-203.
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8. Khalid, K.A. and A.M.A. Ahmed, 2020. Agriculture locations induced variations in the essential oil of valencia orange. J. Essent. Oil Bear. Plants, 23: 1438-1449.
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9. Khalid, K.A. and A.M.A. Ahmed, 2020. Active ingredients of essential oil separated from volkamer lemon trees that were treated with nicotinic acid. J. Essent. Oil Bear. Plants, 23: 944-952.
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10. Ahmed, A.M.A., A.E. El-Gohary, S.A. Osman and K.A. Khalid, 2020. Arginine and salinity stress affect morphology and metabolism of Indian borage (Plectranthus amboinicus lour.). Acta Ecologica Sinica, 10.1016/j.chnaes.2020.04.002.
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11. Khalid, K.A., A.E. El-Gohary, A.M.A. Ahmed, F.M.A.M. Elkady and I.M. Talaat, 2019. L-tryptophan affects the essential oil of navel orange under various growing regions. Biocatal. Agric. Biotechnol., Vol. 20. 10.1016/j.bcab.2019.101181.
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12. Khalid, K.A., A.E. El-Gohary and A.M.A. Ahmed, 2019. Exploitation of sweet lemon residues in the production of essential oils. Bull. Natl. Res. Centre, Vol. 43. 10.1186/s42269-019-0193-8.
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13. Khalid, K.A. and A.M.A. Ahmed, 2019. Benzoic acid induced variations in essential oil of Valencia orange trees grown in reclaimed land of Egypt. J. Essent. Oil Bearing Plants, 22: 851-857.
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14. Ahmed, A.M., I.M. Talaat and K.A. Khalid, 2019. Hexaconazole and sodium selenate effectiveness on the productivity of Moringa oleifera. Bull. Natl. Research Centre, Vol. 43. 10.1186/s42269-019-0113-y.
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15. Khalid, K.A. and A.M.A. Ahmed, 2019. Salicylic acid modifies the active ingredient of sour orange.
    Jordan J. Bio. Sci., 12: 659-662.
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16. Mostofa, M.G., A. Ghosh, Z.G. Li, M.N. Siddiqui, M. Fujita and L.S.P. Tran, 2018. Methylglyoxal-a signaling molecule in plant abiotic stress responses. Free Radical Biol. Med., 122: 96-109.
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17. Khalid, K.A., A.E. El-Gohary and A.M.A. Ahmed, 2018. Effect of the interaction between salicylic acid and geographical locations on grapefruit essential oil. J. Essent. Oil Bearing Plants, 21: 1594-1603.
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18. Ahmed, A.M.A., F.M.A.M. Elkady and A.K. Khalid, 2018. Morphological and chemical characters of Petroselinum crispum (Mill) subjected to some biostimulants. Asian J. Plant Sci., 17: 96-106.
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19. Ahmed, A.M.A., F.M.A.M. ElKady and K.A. Khalid, 2018. Comparison between salicylic acid and selenium effect on growth and biochemical composition of celery. Asian J. Plant Sci., 17: 150-159.
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20. Khattab, H., I. Talaat and A. Ahmed, 2017. Impacts of some biostimulants on the phenolic synthesis and furanochromones content in Ammi visnaga L. J. Funct. Environ. Bot., 7: 65-76.
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21. Khalid, K.A. and A.M. Ahmed, 2017. Response of summer savory essential oil to the ascorbic acid under arid lands. J. Essential Oil Bear. Plants, 20: 1502-1510.
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22. Ahmed, M.A. and A.K. Khalid, 2017. Influence of kinetin on growth, chemical constituents and nutrient content of black cumin (Nigella sativa L.). Bangladesh J. Bot., 46: 783-787.
23. Ahmed, A.M.A., I.M. Talaat and K.A. Khalid, 2017. Citric acid affects Melissa officinalis L. essential oil under saline soil. Asian J. Crop Sci., 9: 40-49.
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24. Ahmed, A.M.A., I.M. Talaat and A.K. Khalid, 2017. Soil moisture and glutamic acid affect yield, volatile oil and proline contents of oregano herb (Origanum vulgare L.). Int. J. Bot., 13: 43-51.
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25. Khalid, A.K. and A.M.A. Ahmed, 2016. Effect of cobalt on growth, yield and chemical constituents of Nigella sativa L. J. Mater. Environ. Sci., 7: 2201-2207.
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26. Talaat, I.M., H.I. Khattab and A.M. Ahmed, 2014. Changes in growth, hormones levels and essential oil content of Ammi visnaga L. plants treated with some bioregulators. Saudi J. Biol. Sci., 21: 355-365.
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27. Khalid, A.K. and A.M.A. Ahmed, 2011. Effect of harvest time on the lemon balm essential oils. Acta Horticulturae, 925: 237-242.
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28. Shaltout, K.H., Y.M. Al-Sodany, A. El-Keblawy and A.M. Ahmed, 2009. Effect of seed type, water regime and partial cutting on the growth performance of Emex spinosa (L.) Campd in Egypt. J. Applied Sci. Res., 5: 648-661.
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29. Shaltout, K.H., M.A. El-beheiry, I.E. Ismail and A.M. Ahmed, 2009. Effect of Seed Type, Water Regime and Partial Cutting on the Nutritive Value of Emex spinosa (L.) Campd. in Egypt. Aust. J. Basic Appl. Sci., 3: 895-903.
30. Khalid, A.K., W. Cai and A.M.A. Aisha, 2009. Effect of harvesting treatments and distillation methods on the essential oil of lemon balm and apple geranium plants. J. Essent. Oil Bear. Plants, 12: 120-130.
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