Aboutalebi, A. and H. Hassanzadeh. 2007. Citrus germplasms, cultivars and rootstocks. Andisheh Avand Publications, 224 p. (In Persian).

Ahmadi, K., H. R. Ebadzadeh, H. Abdshah, A. Kazemian and M. Rafiei. 2017. Agricultural statistics. Jihad-Keshavarzi Ministry. (In Persian)

Ahmed, M. A., M.E. Abdelfattah and Y.H. Mohamed. 1995. Effect of Urea, some micronutrients and growth regulator foliar sprays on the yield, fruit quality and some vegetative characters of Washington navel orange trees. Hort Science, 30(4).

Albrigo, L. and N. Syvertsen. 2001. What about foliar NPK on citrus? Fluids Journal, 9(3): 1-3.

Ali, A. G. and C. Lovatt. 1992. Winter application of low biuret Urea to the foliage of Washington navel orange increased yield. Journal of American Society of Horticultural Science, 119: 1144-1150.

Al-Nabawy, S. M., I.M. Desouky and H.M. El-Hennawy. 1975. Effect of nitrogen rate and time of application on fruit set and drop of Washington novel orange. Ann. Agric. Sci. Univ. Anish. 20(2): 167-170.

Andrews, P. K. 2002. How foliar-applied nutrients affect stresses in perennial fruit plant. Paper presented at the International Symposium on Foliar Nutrition of Perennial Fruit Plants, 31: 246.

Anounymous. 2019. Extension expert report. Minutes of Weighting of Indexed Gardens of Horticultural Crops, Chartagh Region of Simakan Jahrom, 4 November. (In Persian)

Arora, R. K. and R. Xamadagni. 1989. Effect of different levels of nitrogen and Zinc spray on flowering, fruit set and final retention in Sweet lime. Haryana. Agric. Univ. J. Res. 16(3): 233-236.

Asadi-Kangarshahi, A., N. Akhlaghi-Amiri, M. J. Malakuti and B. Moradi. 2005. Effect of amount and application method of Zinc sulfate on yield and quality on Unshu mandarin. Journal of Soil and Water Science, 21: 1-12. (In Persian)

Babu, G. H. and R. S. Rajput. 1984. Effect of Zinc, 2,4-D and GA₃ on fruiting of Kagzi lime. Ind. Hort. 41(3/4): 219-220.

Baker, E. L., H. Selim, H. Swedan and A. M. Hussein. 1987. Effect of GA₃, Alar and Zinc on floral initiation and differentiation of Amoun orange tree. Egypt. Hort. 8(2): 155-159.

Balakrishnan, K., K. Vekatesan, and S. Sambandamurthis. 1996. Effect of foliar application of Zn, Fe, Mn and B on yield quantity of pomegranate, cv. Ganesh. Orissa Journal of Horticulture, 24: 33-35.

Behrouznam, B. and A. Hassanpour. 2005. Effect of nitrogen and Zinc on quantity and quality on Jahrom lemon. In Proceeding of the 4^th Iranian Horticultural Science Congress, Mashhad, Ferdowsi University, 10-17 December. (In Persian)

Bondada, B. R., J. P. Syvertsen and L.G. Albrigo. 2001. Urea nitrogen uptake by citrus leaves. Horticultural Science. 36: 1061-1065.

Bor, D., J. Duncan, A. C. Lee, A.  Parr and A. M. Owen.  2006. Frontal lobe involvement in spatial span: Converging studies of normal and impaired function. Neuropsychology, 44(2): 229-237.

Broadley, M. R., P. J. White, J. P. Hammond, I.  Zelko and A. Lux. 2007. Zinc in plants. New Phytology, 173(4): 677-702.

Castr, J. and C. Sotomayor.  1997. The influence of boron and Zinc sprays bloom time on almond fruit set. Acta Horticulture, 470: 402-405.

Dadrasnia, A., A. Forghani, B. Moradi and R. Fifaei. 2008. The effect of Urea foliar application on the properties of Thomson Novell orange. Journal of Agricultural Agriculture, 11(2): 41-47.

Devi, D.D., P. S. Srilivasan and K. Balakvishlan. 1997. Leaf nutrient compositon chlorosis and yield of Sathgudi orange as affected by micronutrient application.  Dep.of Pomology, Hortic.  College and Res. Ins. Coimbatore. India.      

Disante, K. B., D. Fuentes and J. Cortina.  2010. Response to drought of Zn-stressed Quercus suber L. seedlings. Environmental and Experimental Botany, 70: 96-103.

Fotoohi Ghazvini, R. and J. Fattahi Moghaddam. 2016. Citrus growing in Iran. Guilan University Press. Fouth Edition, 464 p. (In Persian)

Ghaffarpurbisheh, A. 2008. Effect of application method and amount of nitrogen and sulfure on yield and quality of Thompson navel sweet orange. M.Sc. Thesis, Islamic Azad University of Abhar. (In Persian)

Hao, H., Y. Wei, X. Yang, Y. Feng and C. Wu. 2007. Effects of different nitrogen fertilizer levels on Fe, Mn, Cu and Zn concentrations in shoot and grain quality in rice (Oryza sativa). Rice Science, 14(4): 289-294.

Hewitt, E. J. 1993. Essential nutrient elements for plants in plant physiology. ABS III, Academic press. 584.

Higa, T. 1972. Studies on flower bud differentiation and development and artificial treatments on flowering and fruit set in Satsuma. Science Bulletin of the college of Agriculture University of Ryukyus. 1-5.

Http://Irmo.ir

Khayambashi, B., M. Tadayonnejad and A. Akhotian Ardakani. 2007. Study the changes in yield and quality of pomegranate as influenced by Zn, Fe and B elements. In Proceeding of the 5^th Iranian Horticultural Science Congress, Shiraz University, 6-12 September. (In Persian)

Legaz, F. and E. Millo. 1983. Influence of irrigation and fertilization on the Navel sweet orange. Paper presented at the Proceeding of the International Scoiety of Citriculture, 20: 591-595.

Lovatte, C. J. 1999. Timing citrus and avocado foliar nutrient application to increase fruit set and size. Horticultural Technology, 9(4): 607-612.

Mongi, Z. and A. Thomas. 2018. Plant nutrients for citrus trees. Soil and Water Science Department, UF/IFAS Extension, Gainesville, FL 32611. Visit the EDIS website at http://edis.ifas.ufl.edu.

Moradi, B. and H. Ebadi. 2007. Effect of foliar application of Urea on yield and quality of Thopson navel sweet orange. In Proceeding of 10^th Iranian Soil Science Congress, Karaj. (In Persian)

Nebauer, S. G., C. Avila, A. García-Luis and J. L. Guardiola. 2006. Seasonal variation in the competence of the buds of three cultivars from different Citrus species to flower. Trees, 20: 507-514.

Noor, Y., Z. Shah and M. Tariq. 2019. Effect of Zinc and boron using different application methods on yield of citrus (Sweet orange) in calcareous soils. Sarhad Journal of Agriculture, 35(4): 1247-1258.

Razzaq, K., A. S. Khan, A. U. Malik, M. Shahid and S. Ullah. 2013. Foliar application of Zinc influences the leaf mineral status, vegetative and reproductive growth, yield, and fruit quality of ‘Kinnow’ mandarin. Journal of Plant Nutrition, 36: 1479-1495.

Salem, A. T., A. E. Kilany and G. Shaker. 2004. The influence of N, P, K sources and potassium foliar application on growth and fruit quality of Thompson seedless grapevines. Paper presented at the XXVI Internation Horticultural Congress: Viticulture-living eigth limitations. 31/Aug/2004. Toronto, Canada, Actahort, International Society of Horticultural Science, 640: 163-173.

Singh, B. 1984. Effect of nitrogen fertilization on quality of lemon. Indian Horticulture, 16: 308-311.

Taghavi, G.R. 2000. Effect of micro nutrients and foliar application of Zinc sulfate on yield and quality of pomegranate. In Proceeding of 2^nd National Confrence of Optimum Consumption of Chemical Fertilizers and Pesticides in Agriculture, 24-26 January, Karaj. pp. 230-231. (In Persian)

Thomas, A., M. Zekri and H. Stephen. 2008. General soil fertility and citrus tree nutrition. Nutrition of Florida Citrus Trees, SL 253, 100(2): 16-18.

Tsonko, T. and F. Lidon. 2012. Zinc in plants-an overview. Emir. J Food Agric. 24.