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SOME GROWTH PARAMETERS, SEED YIELD AND YIELD COMPONENTS OF RAPESEED (Brassica spp. L.) GENOTYPES SOWN AT DIFFERENT DATES | ||
| The Iraqi Journal of Agricultural Science | ||
| Article 1, Volume 38, Issue 1, 2007, Pages 85-100 | ||
| Authors | ||
| A. A. Ali; ; R. H. Baker | ||
| Abstract | ||
| A field experiment was conducted at the Experimental Farm, College of Agriculture during two winter seasons 2003-2005. The objective was to study the effect of sowing dates on yield and yield components of rapeseed genotypes. A split-plot design with three replications was used. Five sowing dates (28th of Sep.. 18"* of Oct., 7th of Nov.. 27* of Nov. and 17* Dec.) were assigned in main plots, whereas genotypes (Pactol, Sputnik, Srew, Pluto, Star, Topscore, Pioneer and Catolarcia) as sub-plots. The first date (28/9) gave the highest seed yield (3.3 and 2.1 t/lia) respectively, due to plants superiority of this date in number of leaves, branches and liight, besides increase in seed weight rate 3.41 mg for (2003-2004) season and number of siliques/plant 342 silique for (2004-2005). Two genotypes, Pioneer in (2003-2004) and Catolarcia in (2004-2005) were superior in seed yield (3.1 and 1.8 t/ha) respectively. The superiority of first genotype was due to extension of period from flowering to physiological maturity (84 d), hence increase of seed weight rate to 5.48 mg. Yield of second genotype was due to increased number of siliques/plant (494 silique). There was a significant interaction between sowing dates and genotypes in yield and yield components. Pioneer genotype yielded more seed yield (3.9 t/ha on 18 of Oct.) 2003-2004 and Srew genotype yielded more seed yield (3.5 t/ha on 28 of Sep.) 2004-2005. There was a positive significant correlation between yield and seed weight rate (r = 60) in 2003-2004, and between yield and number of siliques/plant (r = 45) in 2004-2005 | ||
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