1. 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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2. 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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3. Khalid, K.A., 2019. Harvest stages and their influences on Lantana camara L. essential oil. Biocatal. Agric. Biotechnol., Vol. 22. 10.1016/j.bcab.2019.101403.
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4. 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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5. Amer, H.M., D.A. Marrez, A.B. Salama, H.E. Wahba and K.A. Khalid, 2019. Growth and chemical constituents of cardoon plant in response to foliar application of various algal extracts. Biocatal. Agric. Biotechnol., Vol. 21. 10.1016/j.bcab.2019.101336.
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6. 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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7. Wahba, H.E. and A.K. Khalid, 2018. Comparative study on essential oil composition in various organs of sodom apple (Calotropis procera) grown wild in Egypt. Asian J. Plant Sci., 17: 85-90.
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8. 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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9. Khalid, K.A., 2018. Nitrogen application and different plant densities effectiveness on the productivity of parsley crop. Asian J. Crop Sci., 10: 141-150.
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10. Khalid, K.A., 2018. Evaluation of black cumin oils under various nitrogen treatments. J. Mater. Environ. Sci., 9: 873-878.
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11. El-Gohary, A., K.A. Khalid and M.S. Hussein, 2018. Effect of drying and distillation techniques on the oil ingredients of mint (Mentha sp.). Asian J. Crop Sci., 10: 151-159.
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12. Badawy, E.S.M., K.A. Khalid, A.A.E.M. Heikal and M.M. Nagdy, 2018. Effect of salinity stress and soil types on growth, photosynthetic pigments and essential oil of Artemisia annua L. Asian J. Crop Sci., 10: 40-47.
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13. 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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14. 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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15. Mohamed, M.A., A.K. Khalid, H.E. Wahba and M.E. Ibrahim, 2017. Effect of different locations and growing season on growth and active materials of aloe. J. Mater. Environ. Sci., 8: 4220-4225. J. Mater. Environ. Sci., 8: 4220-4225.
16. Khalid, K.A., H.M. Amer, H.E. Wahba, S.F. Hendawy and T.M. Abd El-Razik, 2017. Selenium to improve growth characters, photosynthetic pigments and essential oil composition of chives varieties. Asian J. Crop Sci., 9: 92-99.
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17. Khalid, K.A. and A.M.A. Ahmed, 2017. Growth and certain biochemical components of black cumin cultivated under salinity stress factor. J. Mater. Environ. Sci., 8: 7-13.
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18. 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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19. Khalid, A.K., 2017. Impact of nitrogen, phosphorous, potassium and foliar feeding on total lipids and fatty acids of Nigella sativa L. grown in arid zones. Int. J. Bot., 13: 52-58.
20. Khalid, A.K., 2017. Evaluation of fixed oil and fatty acids of black cumin under cobalt or kinetin treatments. J. Mater. Environ. Sci., 8: 1554-1559.
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21. Khalid, A.K., 2017. Changes in lipids and fatty acids of Nigella sativa L. under salinity stress. J. Mater. Environ. Sci., 8: 3502-3507.
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22. Ibrahim, M.E., S.S. Ahmed, K.A. Khalid and S.A. El-Sawi, 2017. Characterization of essential oil content isolated from Rhus flexicauli (Baker). Int. Food Res. J., 24: 897-899.
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23. Ahmed, S.S., M.E. Ibrahim, A.K. Khalid and S.A. El-Sawi, 2017. Phytochemicals, volatile oil and biological activities of Triumfetta flavescens (Hochst). Int. Food Res. J., 24: 2102-2106.
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24. 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.
25. 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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26. Ahmed, A.M.A., I.M. Talaat and A.K. Khalid, 2017. Citric acid affects Melissa officinalis L. essential oil under saline soil. Asian J. Crop Sci., 9: 40-49.
27. Mohamed, M.A., M.E. Ibrahim, H.E. Wahba and K.A. Khalid, 2016. Yield and essential oil of sweet basil affected by chemical and biological fertilizers. Res. J. Med. Plant, 10: 246-253.
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28. Mohamed, M.A., H.E. Wahba, K.A. Khalid, M.E. Ibrahim, S.S. Ahmed and H. Motawe, 2016. Effect of ammonium nitrateon yield of leaves, gel and crude aloin of Aloe vera L. J. Mater. Environ. Sci., 7: 4657-4662.
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29. Khalid, K.A., 2016. Impact of Cobalt Ion on Essential Oil Composition Extracted from Nigella sativa L. Res. J. Med. Plants, 10: 409-413.
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30. Khalid, K.A., 2016. Essential oil constituents of summer savory plants propagated and adapted under Egyptian climate. J. Appl. Sci., 16: 54-57.
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31. Khalid, K.A. and M.R. Shedeed, 2016. Yield and chemical composition of Nigella sativa L. essential oil produced under kinetin treatments. J. Essential Oil Bearing Plants, 19: 1740-1746.
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32. Khalid, K.A. and A.M.A. Ahmed, 2016. Effect of foliar nutrition on Nigella sativa L. plants cultivated under ammonium sulfate treatments. Int. J. Bot., 12: 11-16.
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33. Khalid, A.K., 2016. Effect of soil solarization on yield, essential oil and nutrient content of basil species. Bangladesh J. Bot., 45: 619-625.
34. Khalid, A.K. and M.R. Shedeed, 2016. GC-MS analyses of black cumin essential oil produces with sodium chloride. Int. Food Res. J., 23: 832-836.
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35. 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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36. Ibrahim, M.E., S.S. Ahmed, K.A. Khalid and S.A. El Sawi, 2016. Essential oil composition of Iphiona scabra (DC) grow wild in Egypt. Int. Food Res. J., 23: 1823-1826.
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37. Khalid, K.A., E.A. Omer, A.G. El Gendy and M.S.H. Hussein, 2015. Impact of organic compost and humic acid on essential oil composition of sweet fennel (Foeniculum vulgare var. Dulce) under sandy soil conditions in Egypt. World J. Pharmaceut. Sci., 3: 160-166.
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38. Khalid, K.A., 2015. Volatile oil constituents of sweet fennel fruits treated with some macro and micro nutrients under desert conditions in Egypt. Moroccan J. Chem., 3: 229-237.
39. Khalid, K.A., 2015. Seed yield, fixed oil, fatty acids and nutrient content of Nigella sativa L. cultivated under salt stress conditions. J. Agron., 14: 241-246.
40. Khalid, K.A., 2015. Effect of macro and micro nutrients on essential oil of coriander fruits. J. Mater. Environ. Sci., 6: 2060-2065.
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41. Khalid, A.K., 2015. Quality and quantity of pimpinella anisum L. essential oil treated with macro and micronutrients under desert conditions. Int. Food Res. J., 22: 2396-2402.
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42. Khalid, A.K. and M.R. Shedeed, 2015. Effect of NPK and foliar nutrition on growth, yield and chemical constituents in Nigella sativa L. J. Mater. Environ. Sci., 6: 1709-1714.
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43. Ibrahim, M.E., M.A. Mohamed and K.A. Khalid, 2015. Effect of plant growth regulators on the rooting of lemon verbena cutting. J. Mater. Environ. Sci., 6: 28-33.
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44. Ibrahim M.E., M.A. Mohamed and K.A. Khalid, 2015. Growth and essential oil composition affected by foliar nutrition application on lemon verbena plant. J. Mater. Environ. Sci., 6: 1824-1828.
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45. Ahmed, S., M. Ibrahim and K. Khalid, 2015. Investigation of essential oil constituents isolated from trichodesma africanum (L.) grow wild in Egypt. Res. J. Med. Plant, 9: 248-251.
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46. Khalid, A.K., 2014. Influences of silicate dissolving bacteria and natural potassium on growth and essential oil of rue plant. Thai J. Agric. Sci., 47: 31-36.
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47. Khalid, A.K., 2014. Essential oil composition of some spices treated with phosphorous in arid regions. J. Essent. Oil Bearing Plants, 17: 972-980.
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48. Khalid, A.K., 2014. Essential oil composition of some spices treated with nitrogen in arid regions. Int. Food Res. J., 21: 2305-2309.
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49. Khalid, A.K. and M.R. Shedeed, 2014. The effects of saline irrigation water and cobalt on growth and chemical composition in Nigella sativa. Nusantra Biosci., 6: 146-151.
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50. Khalid, A.K. and M.R. Shedeed, 2014. Influence of kinetin on growth and biochemical accumulation in Nigella sativa L. plants grow under salinity stress conditions. Thai J. Agric. Sci., 47: 195-203.
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51. Khalid, A.K. and A.E. El-Gohary, 2014. Effect of seasonal variations on essential oil production and composition of Plectranthus amboinicus (Lour.) grow in Egypt. Int. Food Res. J., 21: 1859-1862.
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52. Ibrahim, M.E., S.S. Ahmed, S.A. El-Sawi and K.A. Khalid, 2014. Investigation of essential oil extracted from Solenstemma arghel (Dellile) Hayne. J. Essent. Oil Bearing Plants, 17: 629-632.
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53. Ibrahim, M.E., M.A. Mohamed and K.A. Khalid, 2014. Effect of growing locations on the essential oil content and compositions of lemon verbena shrubs under the conditions of Egypt. J. Essent. Oil Bearing Plants, 17: 288-294.
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54. Ibrahim, M.E., M.A. Mohamed and K.A. Khalid, 2014. Effect of frequent harvest on yield and essential oil of lemon verbena grow under Egyptian conditions. J. Mater. Environ. Sci., 5: 1355-1359.
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55. El-Gohary, A.E., S.E. El-Sherbeny, G.M.E.M. Ghazal, K.A. Khalid and M.S. Hussein, 2014. Evaluation of essential oil and monoterpenes of peppermint (Mentha piperita L.) under humic acid with foliar nutrition. J. Mater. Environ. Sci., 5: 1885-1890.
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56. Metwally, S.A., A.K. Khalid and B. Abou-Leila, 2013. Effect of water regime on the growth, flower yield, essential oil and proline contents of Calendula officinalis. Nusantara Biosci., 5: 65-69.
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57. Khalid, K.A., 2013. Effect of nitrogen fertilization on morphological and biochemical traits of some apiaceae crops under arid region conditions in Egypt. Nusantara Biosci., 5: 15-21.
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58. Khalid, A.K., 2013. Effect of potassium uptake on the composition of Calendula officinalis L. flower's content of essential oil. Emirates J. Food Agric., 25: 189-195.
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59. Ibrahim, M.M. and A.K. Khalid, 2013. Phenotypic recurrent selection on herb growth yield of citronella grass (Cymbopogon nardus) grown in Egypt. Nusantara Biosci., 5: 70-74.
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60. Khalid, K.A., 2012. Effect of phosphorous fertilization on anise, coriander and sweet fennel plants growing under arid region conditions. Med. Aromat. Plant Sci. Biotechnol., 6: 127-131.
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61. Khalid, K.A., 2012. Effect of NP and foliar spray on growth and chemical compositions of some medicinal apiaceae plants grow in arid regions in Egypt. J. Soil Sci. Plant Nutr., 12: 581-596.
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62. Khalid, K.A. and M.S. Hussien, 2012. Effect of cattle and liquid manures on essential oil and antioxidant activities of celery (Apium graveolens L.) Fruits. J. Essent. Oil Bear. Plants, 15: 97-107.
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63. Khalid, A.K., 2012. Soil solarization and its effects on medicinal and aromatic plants. Bioscience, 4: 36-44.
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64. Khalid, A.K., 2012. Influence of hydro-distillation time on the yield and quality of dill volatile constituents. Med. Aromat. plant Sci. Biotechnol., 6: 46-49.
65. Khalid, A.K., 2012. Biological fertilization and its effect on medicinal and aromatic plants. Nusantara Biosci., 4: 124-133.
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66. Khalid, A.K. and A.T.S. Jaime, 2012. Biology of Calendula officinalis Linn: Focus on pharmacology, biological activities and agronomic practices. Med. Aromat. Plant Sci. Biotechnol., 6: 12-27.
67. Hendawy, S.F., S.E. El-Sherbeny, M.S. Hussein, K.A. Khalid and G.M. Ghazal, 2012. Response of two species of black cumin to foliar spray treatments. Aust. J. Basic Applied Sci., 6: 636-642.
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68. Behtari, B., F. Gholami, A.K. Khalid, G.D. Tilaki and R. Bahari, 2012. Effect of growth stages and altitude on artemisia herba-alba asso essential oil growing in Iran. J. Essent. Oil Bear. Plants, 15: 307-313.
69. Khalid, K.A., 2011. Evaluation of Salvia officinalis L. essential oil under selenium treatments. J. Essent. Oil Res., 23: 57-60.
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70. Khalid, K.A. and W. Cai, 2011. The effects of mannitol and salinity stresses on growth and biochemical accumulations in lemon balm. Acta Ecol. Sinica, 31: 112-120.
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71. 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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72. Hendawy, S.F. and A.K. Khalid, 2011. Effect of chemical and organic fertilizers on yield and essential oil of chamomile flower heads. Med. Aromat. Plant Sci. Biotechnol., 5: 43-48.
73. Ahmed, K.A., 2011. Effect of potassium nutrition on essential oil of Calendula officinalis L. flowers. Planta Med., Vol. 77. .
74. Said-Al Ahl, H.A.H. and A.K. Khalid, 2010. Response of Coriandrum sativum L. essential oil to organic fertilizers. J. Essent. Oil Bearing Plants, 13: 37-44.
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75. Khalid, K.A., J.A.T. da Silva and W. Cai, 2010. Water deficit and polyethylene glycol 6000 affects morphological and biochemical characters of Pelargonium odoratissimum (L.). Sci. Hortic., 125: 159-166.
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76. Khalid, K.A. and J.A.T. da Silva, 2010. Yield, essential oil and pigment content of Calendula officinalis L. flower heads cultivated under salt stress conditions. Sci. Hortic., 126: 297-305.
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77. Yassen, A.A. and K.A. Khalid, 2009. Influence of organic fertilizers on the yield, essential oil and mineral content of onion. Inter. Agrophys, 23: 183-188.
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78. Khalid, A.K., W. Hu, W. Cai and M.S. Hussien, 2009. Influence of cutting and harvest day time on the essential oils of lemon balm (Melissa officinalis L.). J. Essent. Oil Bear. Plants, 12: 348-357.
79. 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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80. Khalid, A.K., S.M. Zaghloul and A.Y. Abd-Elazim, 2009. Responses of Thyme (Thymus vulgaris L.) to magnesium applications. Med. Aromat. plant Sci. Biotechnol., 3: 52-57.
81. El-Tohamy, W.A., A.K. Khalid, H.M. El-Abagy and S.D. Abou-Hussein, 2009. Essential oil, growth and yield of onion (Allium cepa L.) in response to foliar application of some micronutrients. Aust. J. Basic Appl. Sci., 3: 201-205.
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82. Khalid, A.K., W. Hu and W. Cai, 2008. The effects of harvesting and different drying methods on the essential oil composition of lemon balm (Melissa officinalis L.). J. Essent. Oil Bear. Plants, 11: 342-352.
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83. Khalid, K.A., S.E. El-Sherbeny and A.M. Shafei, 2007. Response of Ruta graveolens L. to rock phosphate and/or feldspar under biological fertilizers. Arab Univ. J. Agri. Sci., 15: 203-213.
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84. Acourene, S., K.A. Khalid, A. Bacha, M. Tama and B. Taleb, 2007. Optimization of bakery yeast production cultivated on musts of dates. J. Applied Sci. Res., 3: 964-971.
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85. Khalid, K.A., S.F. Hendawy and E. El-Gezawy, 2006. Ocimum basilicum L. production under organic farming. Res. J. Agric. Biol. Sci., 2: 25-32.
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86. Khalid, K.A., A.A. Yassen and S.M. Zaghloul, 2006. Effect of soil solarization and cattle manure on the growth, essential oil and chemical composition of Calendula officinalis L. plants. J. Applied Sci. Res., 2: 142-152.
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87. Khalid, K.A., 2006. Influence of water stress on growth, essential oil and chemical composition of herbs (Ocimum sp.). Int. Agrophys., 20: 289-296.
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88. Khalid, K.A. and AH. EL-Ghorab, 2006. The effect of presowing low temperature on essential oil content and chemical composition of Calendula officinalis L. J. Essent. Oil Bear. Plants, 9: 32-41.
89. Khalid, K.A., S.D. Abou-Hussien and S.R. Salman, 2005. Influence of sulphur and biofertilizer (Sulphur- Oxidizing Bacteria) on the growth, oil and chemical composition of Celery plant. Ann. Agric. Sci., 50: 249-262.
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90. Khalid, K.A. and A.M. Shafei, 2005. Productivity of dill (Anethum graveolens L.) as influenced by different manure rates and sources. Arab Univ. J. Agri. Sci., 13: 901-913.
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91. Hendawy, S.F. and K.A. Khalid, 2005. Response of sage (Salvia officinalis L.) plants to zinc application under different salinity levels. J. Applied Sci. Res., 1: 147-155.
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92. Khalid, K.A., 2004. Response of white mustard (Sinapis alba L.) plants to calcium superphosphate and phosphorene under calcareous soil conditions. Arab Univ. J. Agric. Sci., 12: 735-747.