Abstract: Taking feed rape Huayouza 62 as research object, this paper studied the effects of sowing date on growth, yield and nutrient uptake and accumulation of feed rapeseed by different sowing dates in the arid and semi-arid area and agro-pastoral transition zone at north foot of Yinshan mountain. The results showed that: Delaying sowing date could shorten the growth period of feed rape, especially the time period from sowing to seedling emergence; lead the effective branch number and stem diameter increasing; decline seedling emergence number, fresh grass yield and nutrient accumulation. While, the changing trend of plant N, P, K contents above ground were different along with the changing trend in sowing date delay. The N content reduced first, then increased. P content increased first then reduced. K content was gradually decreasing. The quantities of N and K accumulation were gradually decreasing, along with the sowing date delaying. The accumulation of P increased first then reduced. For overall consideration, the suitable sowing date for feed rape in the arid and semi-arid area and agro-pastoral transition zone at north foot of Yinshan mountain was from late May to early June.

Key words: Huayouza 62, sowing date, yield, growth characteristic, nutrient accumulation

摘要： 以饲料油菜华油杂62为研究对象，在阴山北麓干旱半干旱农牧交错区，通过分期播种，研究了播期对饲料油菜生长发育、产量及养分吸收累积的影响。结果表明：播期推迟导致饲料油菜生育期缩短，尤其缩短了从播种到出苗的时间；有效分枝数、茎粗随播期推迟而增大；出苗数、鲜草产量、养分累积量随播期推迟而下降；但植株地上部N、P、K含量随播期推迟变化趋势各不相同，氮含量先减小后增大，磷含量先增大后降低，钾含量逐渐降低；随播期推迟氮、钾累积量逐渐降低，磷积累量先增大后降低。综合考虑，阴山北麓干旱半干旱农牧交错区饲料油菜最适宜播期应为5月下旬至6月上旬。

关键词: 华油杂62, 播期, 产量, 生长特性, 养分积累量