1. Addo, Q.A., Darkwa, A., and Ocloo, G.K., Growth analysis of component crops in a maize-soybean intercropping system as affected by time of planting and spatial arrangement, J. Agric. Biol. Sci., 2011, vol. 6, pp. 34–44.
2. Ahmad, A.H., Wahid, A., Khalid, F., Fiaz, N., and Zamir, M.S.I., Impact of organic and inorganic sources of nitrogen and phosphorus fertilizers on growth, yield and quality of forage oat (Avena sativa L.), Cercet. Agron. Mold., 2011, vol. 44, no. 3, pp. 39–49.
3. Ahmad, A.H., Ahmad, R., Ahmad, N., and Tanveer, A., Performance of forage sorghum intercropped with forage legumes under different patterns, Pak. J. Bot., 2007, vol. 39, pp. 431–439.
4. Ahmad, B., Effect of different levels nitrogen seeding density on growth yield and quality of maize fodder, M.Sc. Thesis, Faisalabad, 1999.
5. Ahmad, M., Afzal, M., Ahmad, A., Ahmad, A.U.H., and Azeem, M.A., Role of organic and inorganic nutrient sources in improving wheat crop production, Cercet. Agron. Mold., 2013, vol. 46, no. 1, pp. 15–21.