The quick trunk injector comprises a reservoir pre ssure-meter,a spring balance,a transfusion pipe, a liquid valve,an air pinhead and a switch.

Studies of trunk injection fertilizing in pear trees;

The theories,injection apparatus,(characters),applications and key techniques with the techniques of trunk injection of chemicals were introduced in detail.

Trunk injection can add quickly the nourishment that the plants need urgently but get hardly from the soil or spraying, and have applied in some respects, and can decrease the environment pollution.

Low air-circulation fast dryer consisting of dryer chamber,heating oven,ventilation system and temperature measuring and automatic controlling system,is a fast dryer suitable for running in insulator manufacturing.