Abstract: To study the impact of the delay of sowing time on the growth and quality of forage on the plateau, this research choose 'Jiayan 2' as oat (Avena sativa L. ) planting varieties, and set up three sowing times:early June (traditional sowing), the middle of June (deferred sowing) and late June (deferred sowing), and determinate some indicators of soil physical and chemical properties, grass biomass and nutrients. The results showed that the adjustment of sowing date had no significant effect on the biomass of herbage, the physical or chemical properties of soil, but the crude protein content of oat sown with traditional sowing technology was decreased, which had the phenomenon of nutrient transfer and resorption. The crude protein content of oat sown with delayed sowing date was not changed, while the crude fiber content of oat was decreased. Therefore, delaying the sowing date can increase the nutrient content and palatability of herbage on the premise of ensuring the yield of oat. The best sowing date in this experiment is mid-June.

Key words: Oat, Sowing date adjustment, Nutrient resorption, Crude protein, Crude fiber

摘要： 为了研究播期延后对高原饲草生长和品质的影响，本研究选取'加燕2号’燕麦（Avena sativa L.）品种为试验材料，设置3个播种时间：6月上旬（传统播期）、6月中旬（播期延后）和6月下旬（播期延后），并测定土壤理化性质、牧草生物量和营养成分等指标。结果表明：播期调整对牧草生物量和土壤理化性质无显著影响，但传统技术播种燕麦粗蛋白含量降低，具有养分转移重吸收现象，而播期延后燕麦可以保持粗蛋白含量不降低，同时粗纤维含量减小。因此，播期延后可以在保证燕麦产量的前提下，增加牧草营养含量，并提高适口性，本试验最佳播期为6月中旬。

关键词: 燕麦, 播期调整, 养分重吸收, 粗蛋白, 粗纤维