在天水市半干旱山区研究了不同播期对白菜型冬油菜品种天油8号生长及产量的影响，结果表明，随着播期的推迟，越冬率降低，成熟期提前，花期和生育期缩短；分枝数、单株有效角果数、角果长度、角粒重和千粒重逐渐减少。不同播种期间产量差异极显著， 以8月22日播种的产量最高，为2 486.62 kg/hm2，9月2日以后播种的减产显著。

The effect of Brassica napus variety Tianyou 8’s different sowing dates on its growing and yield was studied in the semi-arid mountainous regions of Tianshui city . The results shows that， with the delayed sowing， winter rate decreased， the early maturity, flowering and fertility shortening； The number of branches， pods per plant， pods length， pods grain weight and thousand kernel weight decreased . The yield difference is significant during the different sowing， the yield of August 22 is highest， reaches 2 486.62 kg/hm2， the yield of after the September 2nd decreased significantly .

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甘肃省重大科技专项“强优势、高产油菜品种创制及示范”(1203NKDF0018)部分内容