Allen, J. R. 1983. Leaf number and maturity in hybrid corn. Agronomy Journal. 65: 233-235.
Altieri, M. A. 1999. The ecological role of biodiversity in agroecosystems. Agriculture, Ecosystem and Environment. 74: 19–31.
Banik, P. and Bagchi, D. K. 1994. Evaluation of rice (Oryza sativa) and legume intercropping in upland situation of Bihar plateau. Indian Journal of Agricultural Sciences. 64: 364–368.
Banik, P. Midya, A., Sarkar, B. K. and Ghose, S. S. 2006. Wheat and chickpea intercropping systems in an additive series experiment: Advantages and weed smothering. European Journal of Agronomy. 24: 325–332.
Brummer, E. C. 1998. Diversity, stability, and sustainable American agriculture. Agronomy Journal. 90: 1–2.
Baumann, D. T., Kropff, M. J. and Bastiaans, L. 2000. Intercropping leek to suppress weeds. Weed Research. 40(4): 359-374.
Carruthers, K. Prithiviraj, B., Cloutier, Q. Fe. D., Martin, R.C. and Smith, D. L. 2000. Intercropping corn with soybean, lupin and forages: yield component responses. European Journal of Agronomy. 12: 103-115.
Carruthers, K., Cloutier, Fe. and Smith, D. L. 1998. Intercropping corn with soybean, lupin and forages: weed control by intercrops combined with interrow cultivation. European Journal of Agronomy. 8: 225-238.
Evans, L. T. 1998. Feeding the Ten Billion, Plants and Population Growth. Cambridge University Press, Cambridge.
Exner, D. N. and Cruse, R.M. 1993. Interseeded forage legume potential as winter ground cover, nitrogen source, and competition. Journal of Production of Agriculture. 6: 226–231.
Fukai, S. and Trenbath, B. R. 1993. Processes determining intercrop productivity and yields of component crops. Field Crops Research. 34: 247–271.
Giller, K.E. Cadisch, G. 1995. Future benefits from biological nitrogen fixation: an ecological approach to agriculture. Plant Soil. 174: 225–277.
Hauggaard-Nielsen, H. Andersen, M. K., Jørnsgaard, B. and Jensen, E. S. 2006. Density and relative frequency effects on competitive interactions and resource use in pea–barley intercrops. Field Crops Research. 95: 256–267.
Hauggaard-Nielsen, H., Ambus, P. and Jense, E. S. 2001. Interspecific competition, N use and interference withweeds in pea-barley intercropping. Field Crops Research. 70: 101-109.
Hayder, G., Mumtaz, . S. S., Khan, A. and Khan, S. 2003. Maize and soybean intercropping under various levels of soybean seed rates. Asian Journal of Plant Science. 2(3): 339-341.
Holm, L. Doll, J. Holm, E. Pancho, J. and Herberger J. 1996. World weed, natural histories and disribution. John wiley & sons, Inc.
Hume, D. F., Shanmugasundaram, S. and Beversdorf, W. I. D. 1985. Soyabean (Glycine max (L.) Merrill ). In: Summerfield R.J., Roberts, E.H. (Eds.), Grain Legume Crops. William Collins, London, pp. 391–432.
Jeyabal, A. and Kuppuswamy, G. 2001. Recycling of organic wastes for the production of vermicompost and its response in rice–legume cropping system and soil fertility. European Journal of Agronomy. 15: 153–170.
Li, L., Sun, J., Zhang, F., Li, X., Yang, S. and Rengel, Z. 2001. Wheat/maize or wheat/soybean strip intercropping, I. Yield advantage and interspecific interactions on nutrients. Field Crops Research. 71: 123-137.
Liebman, M. and Dyck. E. 1993. Crop rotation and intercropping strategies for weed management. Ecology Applied. 3(1):92-122.
Liebman, M. and Davis, A. S. 2000. Integration of soil, crop and weed management in low-input farming systems. Weed Research. 40: 27– 47.
Maingi, M. J., Shisanya, A.C., Gitonga, M. N. and Hornetz, B. 2001. Nitrogen fixation by common bean (Phaseolus vulgaris L.) in pure and mixed stands in semi arid South east Kenya. European Journal of Agronomy. 14: 1–12.
Marchiol, L., Miceli, F., Pinosa, M. and Zerbi, G. 1992. Intercropping of soybean and maize for silage in northern Italy. Effect of nitrogen level and plant density on growth, yield, and protein content. European Journal of Agronomy. 1: 207–211.
Martin, R. C., Voldeng, H. C. and Smith, D. L. 1990. Intercropping corn and soybean in a cool temperate region: yield, protein and economic benefits. Field Crops Research. 23:295–310.
Morris, R. A. and Garrity, D. P. 1993. Resource capture and utilization in intercropping: non-nitrogen nutrients. Field Crops Research. 34: 303-317.
Poggio, S. L. 2005. Structure of weed communities occurring in monoculture and intercropping of field pea and barley. Agriculture, Ecosystem and Environment. 109: 48–58.
Regnier; E. E. and Stoller, E. W. 1989. The Effects of Soybean (Glycine max) Interference on the Canopy Architecture of Common Cocklebur (Xanthium strumarium), Jimsonweed (Datura stramonium), and Velvetleaf (Abutilon theophrasti). Weed Science. 37: 187-195.
SAS Institute, 2002. SAS User’s Guide: Statistics. Version 8, SAS Institute, Cary, North Carolina, USA.
Singh, N. B., Singh, P.P. and Nair, K. P. P. 1986. Effect of legume intercropping on enrichment of soil nitrogen, bacterial activity and productivity of associated maize crops. Experimental Agriculture. 22: 339–344.
Tetio-Kagho, F. and Gardner, F. P. 1988. Response of maize to plant population. II: Reproductive development on yield and yield adjustment. Agronomy Journal 80: 935-945.
Thiyagarajan, C. R. 1994. Studies on the quality of seeds of component crops in maize based intercropping. Madras Agricultural Journal. 81: 46-47.
Van Kessel, C. and Hartley, H. 2000. Agricultural management of grain legumes: has it led to an increase in nitrogen fixation. Field Crops Research. 65: 165-181.
Vandermeer, J. 1989. The Ecology of Intercropping. Cambridge University Press, Cambridge, UK.
Vandermeer, J. 1995. The ecological basis of alternative agriculture. Annual Review Ecological Systems. 26: 201–224.
Vandermeer, J., Van Noordwijk, M., Anderson, J., Ong, C. and Perfecto, I. 1998. Global change and multi-species agroecosystems: concepts and issues. Agriculture Ecosystem and Environment. 67: 1–22.
Weil, R. R. and Mc fadden, M. E. 1991. Fertility and weed stress effects on performance of maize/soybean intercrop. Agronomy Journal. 83:717-721.
Zimdahl, R. L. 1993. Fundamentals of Weed Science. Academic Press, New York.