1- Akmal, M., and Janssens, M.J.J. 2004. Productivity and light use efficiency of perennial ryegrass with contrasting water and nitrogen supplies. Field Crops Research 88: 143-155.
2- Awal, M.A., Koshi, H., and Ikeda, T. 2006. Radiation interception and use by maize/peanut intercrop canopy. Agricultural and Forest Meteorology 139: 74-83.
3- Banik, P., Midya, A., Sarkar, B.K., and Ghose, S.S. 2006. Wheat and chickpea intercropping systems in additive series experiment: advantages and weed smothering. European Journal of Agronomy 24: 325-333.
4- Bell, M.J., Muchow, R.C., and Wilson, G.L. 1987. The effect of plant population on peanuts (Arachis hypogaea) in a monsoonal tropical environment. Field Crops Research 17: 91–107.
5- Boons-prinz, E.R., De Koning, G.H.J., Van Diepen, C.D., and Penning De Vries, F.W.T. 1993. Crop specific simulation parameters for yield forecasting across the European Community. Simulation Reports, CABO-TT, N: 32.
6- Ceotto, E., and Castelli, F. 2002. Radiation use efficiency in flue-cured tobacco (Nicotiana tabacum L.): response to nitrogen supply, climatic variability and sink limitation. Field Crops Research 74: 117-130.
7- Chen, C., Westcot, M., Neill, K., Wichaman, D., and Knox, M. 2004. Row configuration and nitrogen application for barley-pea intercropping in Montana. Agronomy Journal 96: 1730-1738.
8- Faurie, O., Soussana, J.F., and Sinoquet, H. 1996. Radiation interception, partitioning and use in gross-clover mixtures. Annals of Botany 77: 35-45.
9- Fukai, S. 1993. Intercropping-base of productivity. Field Crops Research 34: 239–245.
10- Gosse, G., Varlet-Grancher, C., Bonhomme, R., Chartier, M., Allirand, J.M., and Lemaire, G. 1986. Maximum dry matter production and solar radiation intercepted by a canopy. Agronomie 6: 47–56.
11- Goudriaan, J., and Van Laar, H.H. 1993. Modelling Potential Crop Growth Processes. Kluwer Academic Press. Pp: 236.
12- Hosseinpanahi, F. 2008. Evaluation of yield, yield component and radiation use efficiency in corn/potato intercropping. MSc Thesis. Ferdowsi University of Mashhad. (In Persian with English Summary)
13- Hosseinpanahi, F., Koocheki, A., Nassiri M., and Ghorbani, R. 2010. Evaluation of radiation absorption and use efficiency in potato/corn intercropping. Agroecology 2(1): 45-54. (In Persian with English Summary)
14- Hughes, G., Keatinge, J.D.H., Scott, Cooper, J.B.M., and Dee, N.F. 1987. Solar radiation interception and utilization by chickpea (Cicer arietinum L.) crops in northern Syria. Journal of Agricultural Science 108: 419–424.
15- Jahad-Agriculture Ministry. 2009. Office of Statistic and Information Technology. Agricultural Statistic. First Issue (Crops of 2008). Jihad-Agriculture Ministry Press. (In Persian)
16- Javanshir, A., Dabagh, A., Hamidi, A., and Gholipour, M. 2000. Ecology of intercropping. First Edition. Jihad-Daneshgahi of Mashhad Press. (In Persian)
17- Jeuffroy, M.H., and Ney, B. 1997. Crop physiology and productivity. Field Crops Research 53: 3–16.
18- John, L.L., Timothy, J.A., Daniel, T.W., Kenneth, G.C., and Achim, D. 2005. Maize radiation use efficiency under optimal growth conditions. Agronomy Journal 97: 72-78.
19- Khorasan Razavi Meteorological Organization. 2007. Statistics Report database. Available at Web site http://www.razavimet.gov.ir/pages.aspx?pageID=95 (verified 10 may 2007)
20- Kiniry, J.R., Landivar, J.A., Witt, M., Gerik, T.J., and Wade, L.J. 1998. Radiation use efficiency response to vapor pressure deficit for maize and sorghum. Field Crops Research 56: 265-270.
21- Leach, G.J., and Beech, D.F. 1988. Response of chickpea accessions to row spacing and plant density on a vertisol on the Darling Downs, Southeastern Queensland. II. Radiation interception and water use. Australian Journal of Experiment Agriculture 28: 377–383.
22- Marshall, B., and Willey, R.W. 1983. Radiation interception and growth in intercrop of pearl millet/groundnut. Field Crops Research 7: 141–160.
23- Midmore, D.J. 1993. Agronomic modification of resource use and intercrop productivity. Field Crops Research 34: 358–380.
24- Midmore, D.J., Roca, J., and Berrios, D. 1988a. Potato (Solanum spp.) in the hot tropics. ΙV. Intercropping with maize and the influence of shade on potato microenvironment and crop growth. Field Crops Research 18: 141-157.
25- Monteith, J.L. 1977. Solar radiation and productivity in tropical ecosystems. Journal of Applied Ecology 9: 747-766.
26- Penning de Vries, F.W.T., Brunsting, A.H.M., and Van Laar, H.H. 1974. Products, requirements and efficiency of biosynthesis: a quantitative approach. Journal of Theoretical Biology 45: 339-377.
27- Pouramir, F. 2009. Evaluating of the effect of different planting combinations in the replacement and additive series multiple cropping on yield and yield components of sesame and chickpea. MSc Thesis. Ferdowsi University of Mashhad. (In Persian with English Summary)
28- Pouramir, F., Koocheki, A., Nassiri M., and Ghorbani, R. 2010. Evaluation the effect of different planting combinations on yield and yield components of intercropping sesame and chickpea in additive series. Iranian Journal of Field Crops Research. In Press. (In Persian with English Summary)
29- Rahimi Karizaki, A., Soltani, A., Pourreza, J., and Zeynali, E. 2007. Estimation of extinction coefficient and radiation use efficiency in field growth chickpea. Journal of Agricultural Science and Natural Resources 14(5): 211-221.
30- Rosati, A., Metcalf, S.G., and Lampinen, B.D. 2004. A simple method to estimate photosynthetic radiation use efficiency of canopies. Annals of Botany 93: 567-574.
31- Sinclair, T.R., and Muchow, R.C. 1999. Radiation use efficiency. Advances in Agronomy 65: 215–265.
32- Singh, P., and Sri Rama, Y.V. 1989. Influence of water deficit on transpiration and radiation use efficiency of chickpea (Cicer arietinum L.). Agricultural Forest and Meteorology 48: 317–330.
33- Stewart, D.W., Costa, C., Dwyer, D.L., Smith, R.I., and Hamliton, B.L. 2003. Canopy structure, light interception and photosynthesis in maize. Agronomy Journal 95: 1465-1474.
34- Tesfaye, K., Walker, S., and Tsubo, M. 2006. Radiation interception and radiation use efficiency of three grain legumes under water deficit conditions in a semi-arid environment. European Journal of Agronomy 25: 60–70.
35- Trenbath, B.R. 1974. Biomass productivity of mixtures. Advances in Agronomy 26: 177–210.
36- Tsubo, M., Walker, S., and Mukhalam, E. 2001. Comparison of variation use efficiency of mono/inter-cropping systems with different row orientations. Field Crops Research 71: 17-29.
37- Tsubo, M., Walker, S., and Ogindo, H.O. 2005. A simulation model of cereal–legume intercropping systems for semi-arid regions I. Model development. Field Crops Research 93: 10-22.
38- Watiki, J.M., Fukai, S., Banda, J.A., and Keating, B.A. 1993. Radiation interception and growth of maize/cowpea intercrop as affected by maize plant density and cowpea cultivar. Field Crops Research 35: 123–133.
39- Zhang, L., Vander Werf, W., Bastiaans, L., Zhang, S., Li, B., and Spiertz, J.H. 2008. Light interception and utilization in relay intercrops of wheat and cotton. Field Crops Research 107: 29-42.