本文通过对杂交狼尾草亲本的不同播种期试验对比，提出了杂交狼尾草亲本的最佳播种时间；
In this thesis, Based on the comparison of different sowing date of parents in Pennisetum americanum x P. purpureu, to present the best sowing time for parents in Pennisetum americanum x P. purpureu.
通过对秋大棚黄瓜5个不同播种期进行栽培比较试验，筛选出适宜北京市大兴区秋大棚黄瓜栽培的适宜播种期。
The appropriate date of sowing of autumn greenhouse cucumber is selected from comparative tests for 5 different date of sowing in Beijing municipality.
本文对3个品种、3个播种期的甘蔗植株进行6次锤度取样，并对试验数据进行了统计分析。
The present study analysed the brix of the sugarcane plants of 3 varieties planted at varieous dates.
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