Yield response of winter oilseed rape hybrids to sowing dates, nitrogen supply and fungicides in Northern Germany
Since 1994/95 sowing date trials have been conducted in Northern Germany (Hohenlieth) with eight to ten winter oilseed rape varieties. The sowing dates have been in week 32 (est. August, 10th), week 34 (est. August 23rd) and week 36 (est.September 8th). The seeding rates have been optimised for open-pollinated (OP) varieties with 40, 65 and 80 seeds perm2 and for hybrids with 35, 50 and 50 seeds per m2. On average over 12 years hybrids had higher yields as compared to OP varieties (+ 0.30 t/ha at the early sowing date, + 0.25 t/ha at the medium sowing date and + 0.51 t/ha at the late sowing date). Both variety types have shown their highest yields at medium (normal) sowing dates with an accumulated temperature sum in autumn of 531℃. Especially under late sowing conditions (394℃) hybrids have demonstrated less yield decline.Since 1998 these trials have been extended by two different input levels of nitrogen and triazol fungicides. Input level 1 represents the usual farm practice with the application of 180 kg/ha nitrogen and one triazol treatment in autumn and spring. Input level 2 represents an increase of 60 kg/ha nitrogen and double sprayings of triazol in autumn and spring. The extra yield effects for hybrids have been 0.09 to 0.16 t/na depending on the sowing date. OP varieties have shown a range of 0.09 to 0.15 t/ha depending the sowing date. The combination of normal sowing dates and the higher input level 2 reached maximum yields for hybrids as well as OP varieties. Under economic aspects, however, the input level 1 performed slightly better. OP varieties and hybrids responded similarly concerning sowing date and input levels.
Brassica napus oilseed rape sowing dates nitrogen triazol fungicides hybrids
A.Baer J.Noack M.Frauen
Norddeutsche Pflanzenzucht Hans-Georg Lembke KG, Hohenlieth, D-24363 Holtsee, Germany
国际会议
第十二届国际油菜大会( The 12th International Rapeseed Congress)
武汉
英文
995-998
2007-03-26（万方平台首次上网日期，不代表论文的发表时间）