Allison MF, Flowler EJ and Allen JH. 2001. Response of potato (Solanum tuberosum L.) to potassium fertilizers. The Journal of Agricultural Science, 136(4): 407-426.
Ashraf MW, Saqib N and Sarfraz TB. 2005. Biological effect of bio-fertilizer humic acid on mung beans (Vigna radiata L.). Journal of Biology and Biotechnology, 2(3): 737- 739.
Awad EIMM and EI-Ghamry AM. 2007. Effect of humic acid effective microorganisms (EM) and magnesium on potato in clayey soil. Journal of Agriculture Science. Mansoura University, 32(9): 7629-7639.
Ayas H and Gulser F. 2005. The effect of sulfur and humic acid on yield components and macronutrient contents of spinach. Journal of biological sciences, 5(6): 801- 804.
Azam Shah, S, Mohammad W, Shahzadi SS, Elahi R, Ali A, Basir A and Haroon A. 2016. The effect of foliar application of urea, humic acid and micronutrients on potato crop. Iran Agricultural Research, 35(1): 89-94.
Beukema HP and Vanderzaag DE. 2004. Introduction to potato production. Translated by Rezaei, A.M. and A. Soltani. Fourth Edition. Jehad University Press, Mashad. 179pp. (In Persian).
Buono V, Paradiso A, Serio F, Gonnella M, Gara L de and Santamaria P. 2009. Tuber quality and nutritional components of "early" potato subjected to chemical haulm desiccation. Journal of Food Composition and Analysis, 22(6): 556- 562.
Burton WG. 1948. The potato. Chapman and Hall, London.
Chen Y and T Aviad. 1990. Effect of humic substances on plant growth. In: MacCarthy P, Clapp CE, Malcolm RL and Bloom PR, editors. Humic Substances in Soil and Crop Sciences: Selected Readings). Soil Science Society America, Madison, WI. pp: 161-187.
Delfine S, Tognetti R, Desiderio E and Alvino A. 2005. Effect of foliar application of N and humic acids on growth and yield of durum wheat. Agronomy for Sustainable Development, 25(2): 183-191.
Effatnezhad M and Safaridolatabad S. 2014. Effect of humic acid on different cultivars of potato tubers (Solanum tuberosum). International Journal of Biosciences, 5(12): 12-17.
El-Sayed Hameda EA, Saif-El-Dean A, Ezzat S and El-Morsy AHA. 2011. Responses of productivity and quality of sweet potato to phosphorus fertilizer rates and application methods of the humic acid. International Research Journal of Agricultural Science and Soil Science, 1(9): 383-393.
Fong SS, Seng L and Mat HB. 2007. Reuse of nitric acid in the oxidative pretreatment step for preparation of humic acids from Low Rank Coal of Mukah, Sarawak. Journal of the Brazilian Chemical Society, 18(1): 41-46.
Ghannad M, Ashraf S and Alipour Z. 2014. Enhancing yield and quality of potato (Solanum tuberosum L.) tuber using an integrated fertilizer management. International Journal of Agriculture and Crop Sciences, 7(10), 742-748.
Ghasemi E, Toglo M and Zabihi H. 2012. Effect of nitrogen, potassium and humic acid on vegetative growth, nitrogen and potassium uptake of potato minituber in greenhouse condition. Journal of Agronomy and Plant Breeding Iran, 8 (1): 56-39. (In Persian. (
Harfoush EA, Abdel-Razzek AH, El-Adgham FI and El-Sharkawy AM. 2017. Effects of humic acid and chitosan under different levels of nitrogen and potassium fertilizers on growth and yield potential of potato plants (Solanum tuberosum, L.).Alexandria Journal of Agricultural Research, 62(1): 135‐148.
Jami Moeini M, Modarres Sanavy SAM,
Keshavarz P,
Sorooshzadeh A and
Ganjeali A, 2010. Relationship between root morphological characteristics and nitrogen use efficiency in six potato cultivars. Iranian Journal of Field Crops Research, 8(3): 444-454. (In Persian).
Kaur L, Singh N and Sodhi NS. 2002. Some properties of potatoes and their starches II. Morphological, thermal and rheological properties of starches. Food Chemistry, 79(2): 183-192.
Kaya M, Atak CY, Ciftci S and Unver M. 2005. Effects of zinc and humic acid applications on yield and some yield components of bread wheat (Triticum aestivum L.). Journal of Natural and Applied Sciences, 9(3): 21-33.
Kleinkopf GE, Westermann DT, Wille MJ and Kleinscmidt GD. 1987. Specific gravity of russet Burbank potatoes. American Potato Journal, 64: 579-587.
Maccarthy P. 2001. The principles of humic substances. Soil Science, 166(11): 738-751.
Mahmoud Asmaa R and Hafez Magda M. 2010. Increasing productivity of potato plants (Solanum tubersoum L.) by using potassium fertilizer and humic acid application. International Journal of Academic Research, 2(2): 83-88.
Mohammadzade Motlagh R. 2014. Determine of suitable age's potato seedlings from meristem cultuer for transfer to greenhouse in granular humic fertilizer presentation. M.Sc Thesis Islamic Azad University, Astara Branch. (In Persian. (
Motalebifard R, Najafi N and Oustan S, 2016. Effects of zinc and phosphorus on nutrients, starch and reducing sugar concentrations of potato tubers under with or without water deficit stress. Journal of Water and Soil- Ferdowsi University of Mashhad, 30(2): 497-510. (In Persian)
Motalebifard R, Najafi N, Oustan S, Nyshabouri MR and Valizadeh M, 2014. Effects of soil moisture, phosphorus and zinc levels on the growth attributes of potato in greenhouse conditions. Iranian Journal of Water and Soil Research, 45(1): 75-86. (In Persian).
Motalebifard R, Najafi N, Oustan S, Nyshabouri MR and Valizadeh M, 2013. The combined effects of phosphorus and zinc on evapotranspiration, leaf water potential, water use efficiency and tuber attributes of potato under water deficit conditions. Scientia Horticulturae, 162: 31-38.
Nizamuddin M, Mahmood M, Farooq K and Riaz S. 2003. Response of potato crop to various level of NPK. Asian Journal of Plant Sciences, 2(2): 149-151.
Ozkaynak E and Samanci B. 2005. Yeild and yield components of greenhouse, field and seed bed grown potato (Solanum tuberosum L.) plantlets. Akdeniz University Ziraat Fakultesi Dergisi (Turkey), 18(1): 125-129.
Qadri RWK, Khan I, Jahangir MM, Ashraf U, Samin G, Anwer A, Adnan M and Bashir M. 2015. Phosphorous and foliar applied nitrogen improved productivity and quality of potato. American Journal of Plant Sciences, 6(01), 144-149.
Samadian H. 2014.Study the effects of poultry litter fortified with humic acid on yield of potato cv. Agria minituber. M.Sc Thesis Islamic Azad University, Astara Branch. (In Persian. (
Samavat S, Malakuti M. 2005. Important use of organic acid (humic and fulvic) for increase quantity and quality agriculture productions. Water and soil researchers' technical issue, 463: 1-13.
Sanli A, Karadogan T and Tonguc M. 2013. Effects of leonardite applications on yield and some quality parameters of potatoes (Solanum tuberosum L.). Turkish Journal of Field Crops, 18(1), 20-26
Sasaki T, Yasui T and Matsuki J. 2000. Effect of amylose content on gelatinization, retrogradation and pasting properties of starches from waxy and non-waxy wheat and their F1 seeds. Cereal Chemistry, 77(1): 58-63.
Selim EM, Shedeed SI, Asaad FF and El-Neklawy AS. 2012. Interactive effects of humic acid and water stress on chlorophyll and mineral nutrient contents of potato plants. Journal of Applied Sciences Research, 8(1): 531-537.
Sims JT and Sharpley AN. 2005. Phosphorus: Agriculture and the environment. American Society of Agronomy, Inc, Wisconsin USA.
Singh SK and Lal SS. 2012. Effect of potassium nutrition on potato yield, quality and nutrient use efficiency under varied levels of nitrogen application. Potato Journal, 39(2): 155-165.
Susilawati K, Ahmed OH, Nik Muhammad AM and Khanif MY. 2009. Effect of organic based N fertilizer on dry matter (Zea mays L.), ammonium and nitrate recovery in an acid soil of Sarawak, Malaysia. American Journal of Applied Science, 6(7): 1282-1287.
Suzuki A, Shibanuma K, Takeda Y, Abe J and Hizukuri S. 1994. Structure and pasting roperties of potato starches from jaga kids purple 90 and red 90. Journal of Applied Glycoscience, 41,425-432.
Verlinden G, Pycke B, Mertens J, Debersaques F, Verheyen K, Baert G, Brifs J and Haesaert G. 2009. Application of humic substances results in consistent increases in crop yield and nutrient uptake. Journal of Plant Nutrients, 32(9): 1407-1426.
Yaghbani M and Mohammadzadeh J. 2006. Study on physico-chemical properties of starch from potato cultivars in Golestan province. Iranian Journal of Food Science and Technology, 2 (4), 71-79. (In Persian).
Zelalem A, Tekalign T and Nigussie D. 2009. Response of potato (Solanum tuberosum L.) to different rates of nitrogen and phosphorus fertilization on vertisols at Debre Berhan, in the central highlands of Ethiopia. African Journal of Plant Science, 3(2): 16-24.
)