29 Yasmeen et al. Int. J. Biosci. 2014 RESEARCH PAPER OPEN ACCESS Effect of spring and autumn sowing on morphological attributes of sweet corn genotypes Farhat Yasmeen 1* , Naveed Iqbal Raja 1 , Muzammil Hussain 2 , Neelam Taj 1 , Sunbal Khalil Chaudhari 1 1 Department of Botany, PMAS Arid Agriculture University Rawalpindi, Pakistan. 2 Crop Science Institute, NARC, Islamabad, Pakistan Key words: Sweet corn, morphological traits, seasonal effects, plant height, ear height. http://dx.doi.org/10.12692/ijb/5.1.29-36 Article published on July 02, 2014 Abstract Two field experiments were conducted at National Agriculture Research council Islamabad during 2012-2013 growing season. The 15 sweet corn varieties from diverse geographic origins were chosen to study the morphological traits such as days to maturity, mid node antocyanin, internode length, cob leaf length and width, leaves per plant, ear height, plant height,50% pollen shedding, tessel characters, 50% silk emergence and cob characters. Seed characteristics have also been recorded to have an analysis on yield to check the effect of sowing season. Results showed spring sowing was on average has better effect on sweet corn growth as compared to autumn season. Spring season has resulted better plant height and yield as compared to autumn season. * Corresponding Author: Farhat Yasmeen  msc_arid2007@yahoo.com International Journal of Biosciences | IJB | ISSN: 2220-6655 (Print) 2222-5234 (Online) http://www.innspub.net Vol. 5, No. 1, p. 29-36, 2014