5Krishnareddy SR, Stewart BA, Payne WA, et al. 2009. Grain sorghum tiller production in clump and uniform planting geometries. Journal of Crop Improvement, 24 : 1-11.
6Maddonni GA,Otegui ME, Cirilo AG. 2001. Plant population density row spacing and hybrid effects on maize canopy architecture and light attenuation. Field Crops Research,71 : 183-193.
7Mattera J,Romero LA, Cuatrin AL, et al. 2013. Yield components ,light interception and radiation use efficiency of lucerne (Medicago sativa L. ) in response to row spacing. European Journal of Agronomy, 45: 87-95.
8Ramezani M, Abandani RRS, Mobasser HR, et al. 2011. Effects of row spacing and plant density on silage yield of com (Zea mays L. cv. sc704) in two plant pattern in North of Iran. African Journal of Agricultural Research,6: 1128-1133.