Research is starting to shed some light on how to get competitive yields from semi-dwarf oilseed rape varieties, as Louise Impey finds out. Semi-dwarf oilseed rape varieties are 20% more efficient in their uptake of soil N and produce larger canopiesat flowering, according to the initial results of an HGCA funded project on nitrogen rates and timings. The study, which was also part funded by Growhow, investigated optimum nitrogen rates and timings for semi-dwarf varieties, compared standard height Excalibur with Pioneer's semi-dwarf PR45D03, and also looked at whether canopy management principles can be applied to the shorter types. The work was carried out at three ADAS sites using seven nitrogen rates, varying from 0 to 360kg/ha N, applied at either conventional or canopy managed timings. The use of 0.5 litres/ha of Folicur (tebuconazole) in April was also investigated.
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机译：正如路易丝·伊佩（Louise Impey）所发现的那样，研究开始阐明如何从半矮小的油菜籽品种中获得有竞争力的产量。根据HGCA资助的氮素含量和授粉时期的初步结果，半矮油菜油菜吸收土壤N的效率提高20％，并在开花时产生更大的冠层。该研究也是由Growhow资助的一部分，研究了半矮品种的最佳氮肥施用率和时机，将标准高度Excalibur与先锋的半矮PR45D03进行了比较，并研究了冠层管理原理是否可以应用于较短的矮种。这项工作是在三个ADAS地点进行的，使用了7种氮素，氮素的施用量从0到360kg / ha N不等，适用于常规或林冠管理时期。还研究了4月份使用0.5升/公顷的Folicur（戊唑醇）。
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