<正>对普通条件下10个楸树对不同品种（类型）嫩枝扦插的生根能力进行了比较，选择推广价值较高的圆基长果楸进行正之试玢以获得圆基长果楸嫩枝扦插繁殖的最优技术方案。结果表明：10个品种（娄型）楸树间的生根进程和生根率差异均显著，柠州和灰楸生根能力最好，生根率达到80%以上；南阳楸、圆基长果愀和豫愀1号生根能力较好，生根率超过50%。圆基长果楸正交试验发现：备因素对圆基长果楸的生根率影响效能的大小依次为激素浓度、激索种类、插条粗度、处理时间、插祭长度，圆基长果楸嫩枝扦插的最优组合是用1500mg/kg的ABT6号生根份处理30s，插条长10～12cm、粗0.3～0.6cm。

The theory of the electric motor and torque-speed characteristic curve of the induction motors was used to analyze linear load and thruster loads. The results showed that for an induction motor with frequency speed control, slip did not change with change in frequency when it was drived by linear load. The changes of slip had a relation with frequency and rating slip when it was drived by thruster load. In approximate calculation, the ratio of the slip for the changed frequency to rated slip is equivalent to the square of the ratio of the changed frequency to rated frequency.