Al-Jbawi, E., Sabsabi, W., Gharibo, G. and Al-Sayed Omar, A.E.-M. 2015. Effect of sowing date and plant density on bolting of four sugar beet (Beta vulgaris L.) varieties. International Journal of Environment. 4, 2 (Jun. 2015), 256–270. DOI:https://doi.org/10.3126/ije.v4i2.12647.