一年生禾草在川西北高寒牧区的最佳播期研究

Study on the best seeding time of annual grass in the highland pastoral area of Northwest Sichuan

为充分利用高原有限的热量资源，提高栽培牧草产量和种草的经济效益，设置了一年生禾草不同播期的产草量比较试验。结果表明，一年生禾草在川西北高寒牧区种植，最适播种期应在月平均气温达到２℃以上，土壤解冻后１０ｄ左右，约４月中下旬，最迟不得超过５月下旬。

The yields of annual grass with different sowing time were studied.It was aimed to make full use of the limited heat resource of highland and to enhance herbage productivity.The results showed that the best seeding time of annual grass in highland pastoral area of Northwest Sichuan should better be during the last twenty days of April.And the latest time shouldn't surpass the end of May.During this period,the monthly mean temperature was more than 2. And the soil had been thawed for about 10 days.