Abrishamchi, P., 2003. Investigation about some biochemical changes related to breaking of dormancy and flower formation in Crocus sativus L. 3rd National Symposium on Saffron. 2-3 December, Mashhad, Iran. [in Persian].
Arsalan, N., 2007. Application of response surface methodology and central composite rotatable design for modeling the influence of some operating variables of a multi-gravity separator for chromite concentration. Powder Technol. 86, 769-776.
Behdani, M.A., Koocheki, A., Nassiri Mahallati, M., and Rezvani Moghaddam, P., 2005. Evaluation of quantitative relationships between saffron yield and nutrition (on farm trial). Iran. J. Field Crop Res. 3(1), 1-14. [in Persian with English Summary].
Box, G.E.P., and Hunter, J.S. 1957. Multi-factor experimental designs for exploring response surfaces. The Institute of Mathematical Statistics, pp. 195-241.
Box, G.E.P., and Wilson, K.B., 1951. On the experiment attainment of optimum conditions. J. R. Stat. Soc. Ser. A Stat. Soc. 13, 1-45.
Ghorbani, R., and Koocheki, A., 2006. Organic saffron in Iran: prospects challenges. Proceedings of the 2nd International Symposium on Saffron Biology and Technology. Mashhad, Iran. 28-30 October 2006, p. 369-374. [in Persian].
Heydari, Z.,
Besharati, H., and
Maleki Farahani, S., 2014. Effect of some chemical fertilizer and biofertilizer on quantitative and qualitative characteristics of saffron. J. Saffron Agron. & Technol. 2(3), 177-189. [in Persian with English Summary].
Kafi, M., Rashed Mohassel, M.H., Koocheki, A., and Mollafilabi, A., 2002. Saffron, Production and Processing. Zaban va Adab Press, Iran. 276 pp. [in Persian].
Khorramdel, S., Gheshm, R., Amin Ghafori, A., and Esmaielpour, B., 2014. Evaluation of soil texture and superabsorbent polymer impacts on agronomical characteristics and yield of saffron. J. Saffron Res. 1(2), 120-135. [in Persian with English Summary].
Koocheki, A., 2003. Iranian saffron in worldwide, challenges and opportunities. Proceedings of the Third National Saffron Conference. Mashhad. Iran. [in Persian].
Koocheki, A., 2013. Research on production of saffron in Iran: Past trend and future prospects. J. Saffron Agron. & Technol. 1(1), 3-21. [in Persian with English Summary].
Koocheki, A., and Seyyedi, S.M., 2015. Relationship between nitrogen and phosphorus use efficiency in saffron (Crocus sativus L.) as affected by mother corm size and fertilization. Ind. Crop Prod. 71, 128-137.
Koocheki, A., Jahani, M., Tabrizi, L., and Mohammad Abadi, A.A., 2011. Investigation on the effect of biofertilizer, chemical fertilizer and plant density on yield and corm criteria of saffron (Crocus sativus L.). Journal of Water Soil 25, 196-206. [in Persian with English Summary].
Koocheki, A., Nassiri Mahallati, M., Amiri, M.B., and Fallah Poor, F., 2016. Optimization of nitrogen fertilizer and irrigation in wheat cultivation by central composite design. J. Agroecol. In Press. [in Persian with English Summary].
Koocheki, A., Nassiri Mahallati, M., Khorramdel, S., and Morid Ahmadi, S., 2017. Optimization of plant density and nitrogen use in corn (Zea mays L.) by central composite design. Iran. J. Field Crop Res. 15(4), 798- 810. [in Persian with English Summary].
Koocheki, A., Nassiri Mahallati, M., Moradi, R., and Mansouri, H., 2013a. Optimization of water, nitrogen and density in canola cultivation by central composite design. J. Agroecol. 3(1), 1-16. [in Persian with English Summary].
Koocheki, A., Rezvani Moghaddam, P., Mollafilabi, A., and Seyyedi, S.M., 2012a. Effects of high corm planting density and applying manure on flower and corm yields of saffron (Crocus sativus L.). 4th International Saffron Symposium: Advanced in Saffron Biology Technology and Trade. October 22-25, Kashmir, India.
Koocheki, A., Rezvani Moghaddam, P., Mollafilabi, A., and Seyyedi, S.M., 2013b. The effects of high corm density and manure on agronomic characteristics and corms behavior of saffron (Crocus sativus L.) in the second year. J. Saffron Res. 1(2), 144-155. [in Persian with English Summary].
Koocheki, A., Seyyedi, S.M., and Jamshid Eyni, M., 2014. Irrigation levels and dense planting affect flower yield and phosphorus concentration of saffron corms under semi-arid region of Mashhad, Northeast Iran. Sci. Hortic. 180, 147-155.
Koocheki, A., Tabrizi, L., Aminghafori, A., and Khorramdel, S., 2012b. Evaluation of growth characteristics and yield of saffron (Crocus sativus L.) by application of organic planting beds and different sowing methods. Agroecol. 2(2), 16-30. [in Persian with English Summary].
Kwak, J.S., 2005. Application of Taguchi and response surface methodologies for geometric error in surface grinding process. Int. J. Mach. Tool Manu. 45, 327-341.
Mansouri, H., Banayan Aval, M.,
Rezvani Moghaddam, P., and
Lakzian A., 2015. Management of nitrogen, irrigation and planting density in Persian shallot (
Allium hirtifolium) by using central composite optimizing method. J. Agric. Sci. Sustain. Prod. 24(1), 41-60. [in Persian with English Summary].
Molina, R.V., Renav Morata, B., Nebauer, S.G., Garcia Luis, A., and Guardiola, J.L., 2010. Greenhouse saffron culture temperature effects on flower emergence and vegetative growth the plants. Acta Hort. 850, 91-94.
Munshi, A.M., 1994. Effect of N and K on the floral yield and corn production in saffron under rainfed condition. Indian J. Arcanut Spices. 18, 24-44.
Naghdi Badi, H., Omidi, H., Golzad, A., Torabi, H., and Fotookian, M.H., 2011. Change in crocin, safranal and picrocrocin content and agronomical characters of saffron (Crocus sativus L.) under biological and chemical of phosphorous fertilizers. JMP. 4(40), 58-68. [in Persian with English Summary].
Nassiri Mahallati, M.,
Koocheki A.,
Amin Ghafouri, A., and
Mahlujirad, M., 2015. Optimizing corm size and density in saffron (
Crocus sativus L.) cultivation by central composite design. J. Saffron Agron. & Technol. 3(3), 161-177. [in Persian with English Summary].
Parr, J.F., Papendick, R.I., and Colacicco, D., 1986. Recycling of organic wastes for a sustainable agriculture. Biol. Agric. Hortic. 3, 115-130.
Rezaian, S., and Paseban, M., 2006. The effect of micronutrients and manure fertilizers on the quantity and quality of Khorasan saffron. Proceedings of the 2nd International Symposium on Saffron Biology and Technology. Mashhad, Iran, 28-30 October.
Rezvani Moghaddam, P., Khorramdel, S., Amin Ghafori, A., and Shabahang, J., 2013a. Evaluation of growth and yield of saffron (Crocus sativus L.) affected by spent mushroom compost and corm density. J. Saffron Res. 1(1), 13-26. [in Persian with English Summary].
Rezvani Moghaddam, P., Khorramdel, S., and Mollafilabi, A., 2016. Evaluation of soil physical and chemical characteristics impacts on morphological criteria and yield of saffron (Crocus sativus L.). J. Saffron Res. 32, 188-203. [in Persian with English Summary].
Rezvani Moghaddam, P., Koocheki, A., Mollafilabi, A., and Seyyedi, S.M., 2013b. Effect of biological and chemical fertilizers on replacement corm and flower yield of saffron (Crocus sativus L.). Iran. J. Crop Sci. 15, 234-246. [in Persian with English Summary].
Sadeghi, B., 1993. Effect of corm weight on flowering of saffron. Research and Industrial Institutes of Khorasan Publication, Iran 73 pp. [in Persian].
Sampatha, S.R., Shivashankar, S., and Lewis, Y.S., 1984. Saffron (Crocus Sativus L.)cultivation, processing chemistry and standardization. Crit. Rev. Food Sci. Nutr. 20 (2), 123-157.
Shahandeh, H., 1990. Evaluation of chemo-physical characteristics of soil due to saffron yield at Gonabad, Khorasan Park of Science and Industrial Research, Mashhad, Iran. [in Persian].
Shirani, H., Abolhasani Zeraatkar, M., Lakzian, A., and Akhgar, A., 2011. Decomposition rate of municipal wastes compost, vermi compost, manure and pistachio compost in different soil texture and salinity in laboratory condition. Water Soil 25, 84-93. [in Persian with English Summary].
Turhan, H., Kahriman, F., Egesel, C.O., and Kemal Gul, M., 2007. The effects of different growing media on flowering and corm formation of saffron (Crocus sativus L.). Afr. J. Biotechnol. 6, 2328-2332.