Oilseed rape (Brassica Napus ssp. Oleifera) seed yield depending on several agro-ecological factors
2012
Balodis, O., Latvia Univ. of Agriculture, Jelgava (Latvia) | Gaile, Z., Latvia Univ. of Agriculture, Jelgava (Latvia)
Most significant growing manner tool to gain high seed yield is the understanding about influence of different factors that have important role on winter oilseed rape growing. The lack of knowledge and research on different agro-ecological factors about oilseed rape growing is observed in Latvia. The aim of our research, started in the season of 2007/2008 and continued up to the season of 2010/2011 in Research and Study farm “Vecauce” of Latvia University of Agriculture, was to investigate the influence of agro-ecological factors (sowing date and rate, and fungicide as growth regulator) on seed yield of two types of winter rape cultivars. The observed seed yield results are analyzed in this paper. Rape was sown on five dates, starting with 1 August with ten days intervals. Specific four sowing rates were used in years 2007/2008 and 2008/2009: 120, 100, 80, and 60 germinate able seeds per square m for ‘Californium’ (line) and 80, 60, 40 and 20 germinate able seeds per m2 for ‘Excalibur’ (hybrid). Equal sowing rates for both varieties were used in 2009/2010 and 2010/2011: from 120 to 20 germinate able seeds per m2 with interval of 20 seeds per m2. Fungicide as growth regulator (Juventus 90 s.c. (metconazole, 90 g LE-1) dose: 0.5 L haE-1) was applied for rape plants at 4-6 leaves stage for crop sown on first three sowing dates. The highest average yield from all trial years was observed for variety ‘Californium’ sown on 10 August, and for variety ‘Excalibur’ F1 – sown on 20 August. Winter oilseed rape seed yield was significantly (p is less than 0.05) affected by sowing date. The influence of sowing rate on yield was variable. Fungicide application significantly (p is less than 0.05) increased the seed yield of ‘Californium’ in all trial years, but yield of ‘Excalibur’ – in three out of four trial years: 2008, 2010 and 2011.
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