Arzani, H., Sanaei, A., Barker, A.V., Ghafari, S., and Motamedi, J., 2015. Estimating Nitrogen and Acid Detergent Fiber Contents of Grass Species using Near Infrared Reflectance Spectroscopy (NIRS), Jour. Rangeland Sci., 5(4): 260-268.
Arzani, H., Sour, A. and Motamedi, J. 2012. Potential of Near-Infrared Reflectance Spectroscopy (NIRS) to Predict Nutrient Composition of Bromus tomentellus, Jour. Rangeland Sci., 1 (1): 635-641.
Baghjari, A., 2011. Effects of intercropping on yield and forage quality of alfalfa -Agropyron elngatum in dry land farming conditions of Damavand, MSc. thesis, Azad university of agriculture, Roudehen, Branch (In Persian).
Bahrani, M., J., and Kazemeini, S. A. 2008. Forage yield, botanical composition and adaptation of some forage grasses and legumes in mono and dual cultures (binary combinations), Iranian Jour. Crop Science, 39: 203-210. (In Persian).
Mazaheri, D., Madani, A. and Oveysi, M. 2006. Assessing the land equivalent ratio (LER) Of two corn (Zea mays L.) varieties intercropping at various Nitrogen Levels in KARAJ, IRAN. Jour. Central European Agriculture, 7(2): 359- 364.
Finn J.A., Kirwan L., Connolly J., Sebastià M.T., Helgadóttir A. and Lüscher A. 2012. Four-species grass clover mixtures demonstrate transgressive over yielding and weed suppression in a 3-year continental-scale experiment. Grassland Science in Europe 17, 64-66.
Francis, C. A., 1989. Biological efficiencies in multiple cropping systems, Advance in Agronomy, 42:1-42.
Ghaffari, A., Emami, A. and Hekmat, A. 1998. Comparing of alfalfa with orchard grass hay performance in mixed and pure cultures. Seed and Plant Jour., 3(14): 1-9, (In Persian).
Heydari SharifAbad, H., Akbarzadeh, M., Ansari, N., Yousefi, M., Nabaei, GH., Bagherzadeh, K. and Abrasajy, Gh., A. 2001. Comparison of forage yield among several alfalfa cultivars in rain-fed regions of Iran, Iranian Jour. Rangelands and Forests Plant Breeding and Genetic Research, 4:117-136. (In Persian).
Helgadottir A., Gylfadottir Th.O. and Kristjansdottir T.A., 2013. Changes in species proportion over time in grass-legume mixtures under northern conditions, Grassland Science in Europe, 18: 210-212.
Jafari, A.A., Anvari, H., Nakhjavan, S. and Rahmani, E., 2010. Effects of Phenological Stages on Yield and Quality Traits in 22 Populations of Tall Wheatgrass Agropyron elongatum Grown in Lorestan, Iran, Jour. Rangeland Sci., 2 (4): 9-16.
Jafari, A. 2005. The role of forage grasses and legumes in forage production, Proceedings of the First National Conference on forage crops, Karaj, Faculty of Agriculture, Karaj, Iran. (In Persian).
Jafari, A. A., Nosrati N. and Heydari SharifAbad H., 2003. Comparison of yield, morphological and quality traits of 18 ecotypes/varieties of alfalfa (Medicago sativa) under optimum and drought stress conditions, Iranian Jour. Rangelands and Forests Plant Breeding and Genetic Research, 11(1): 63-103, (In Persian).
Jung, G. A., Shaffer, J. A. and Everhart, J.R., 1996. Harvest frequency and cultivar influence on yield and protein of alfalfa- ryegrass mixture, Agronomy Jour., 88(5):817-822.
Kochaki, A. and Soltani, A. 1998. Principles and agricultural practices in arid areas, publishing, education, agriculture, first printing, (In Persian).
Kochaki, A., Nasiri Mahallati, M., Zare Feyzabadi, A. and Jahanbin, M., 2004. Diversity of farming systems in Iran, Pajouhesh va Sazandegi, 63: 70-83, (In Persian).
Kusmiyati, F., Karno, S. and Pangestu, E., 2013. Effect of mulch and mixed cropping gress-legume at saline soil on growth, forage yield and nutritional quality of Guinea grass, Jour., Indonesian Trop. Anim. Agric. 38(1): 72-78.
Mazaheri, D. 1998. Mixed farming, Tehran University Press, 262 pages, (In Persian).
Mazaheri, D. and Overysi, M., 2004. Effects of inter cropping of two corn vanities at various nitrogen levels. Iranian Jour. Agronomy. 9: 71-76 (In Persian).
Mead, R. and Willey R. W., 1980. The concepts of a land equivalent ratio and advantages in yield from intercropping, Experimental Agriculture., 16: 217-228.
Moynihan, J. M., Simmons, S. R. and Sheaffer, C. C., 1996. Intercropping annual medic with conventional height and semi dwarf barley grown for grain, Agronomy Jou., 88(5): 823-828.
Najafi, A, and Mohseni, Sh., 2003. Forage yield comparison of mixtures of rainfed Medicago sativa-Bromus inermis and Medicago sative-Agropyron elongatum, Iranian Journal Range Desert Research, 10(1):1-15 (In Persian).
Nyfeler, D., Huguenin-Elie O., Suter M., Frossard E., Connolly J. and Lüscher A., 2009. Strong mixture effects among four species in fertilized agricultural grassland led to persistent and consistent transgraessive over yielding, Jour. Applied Ecology, 46: 683-691.
Peyraud J.L., Le Gall A. and Lüscher A. 2009. Potential food production from forage legume-based-systems in Europe: an overview. Irish Jour. Agricultural and Food Research., 48, 115-135.
Poormoradi S. and Jafari A. A. 2009. Forage production in seven ecotypes of red clover (Trifolium pratense) in pure stands and in mix cropping with tall fescue in northern Alborz Mountains, Rangelands Iranian jour. Range and Desert Res., 16(1): 22-33 (In Persian).
Sanderson M.A., 2010. Stability of production and plant species diversity in managed grasslands: Aretrospective study, Basic and Applied Ecology 11: 216-224.
Saremi, S. 2011. Effects of pure and mixed grasses and legumes on forage yield and quality in dry conditions of Borojerd, MSc. Thesis Breeding, Islamic Azad University, Borojerd, 81 p. (In Persian).
Sengul, S. 2003. Performance of some forage grasses or legumes and their mixtures under dry land condition, European Jour. Agronomy, 19:401-409.
Shobeirri, S. S., Habibi, D., Kashani, A., Pak Nejad, F., Jafari, H. and Lamei, J., 2011. Study of dry forage yield and quality of hairy vetch and triticale in pure stand and mixed cropping, Iranian Jour. Crop Sci, 13(2): 269-281, (In Persian).
Sulc, R. M. and Albrecht, K. A., 1996. Alfalfa establishment with diverse annual ryegrass cultivars, Agronomy Jour., 88(3): 442-447.
Ta, T. C. and Faris, M. A., 1987. Effects of Alfalfa proportions and clipping frequencies on Timothy-Alfalfa Mixtures, I: Competition and Yield Advantages, Agronomy Jour., 79:817-820.
Tracy, B., Albrecht, K., Flores, J.P., Hall, M., Islam, A., Jones, G., Lamp, W., Macadam, J., Skinner, R. H. and Teutsch, C., 2013. Forage yield, weed suppression and fertilizer nitrogen replacement value (FNRV) of alfalfa-tall fescue mixtures, Grasslands Federation European Proceedings, 18: 192-194.