上海农学院基础部教师张纪樵最近试制成一种简易小农具——液肥深施器。化肥开穴深施,历来是提高化肥利用率的好形式,而我国农村长期来采用手工开穴施肥,不但劳动强度高,费时多,工效低,而且还影响了化肥利用率。故研制液肥深施器就有一定的现实意义和经济意义。以往,各地研制的液肥注射深施器(亦包括某些国家)均系泵体结构,在实际使用中存在许多问题:加工精度高,结构复杂,操作费力,机具不耐用,适应性差等。张纪樵老师试制的施肥器在结构原理上突破了以泵体结构来达到定量注射的框框, Zhang Jiqiao, a teacher at the Shanghai Agricultural College Foundation, recently experimented with a simple small-scale farming implement - a deep liquid fertilizer device. Deep application of chemical fertilizer has always been a good form of increasing the utilization rate of chemical fertilizers. However, long-term manual hole fertilization in rural areas in China not only results in high labor intensity, time-consuming and low efficiency, but also affects the utilization of chemical fertilizers. Therefore, the development of liquid fertilizer device has a certain practical significance and economic significance. In the past, the deep liquid applicators (including some countries) developed in various places all had pump structure. There were many problems in actual use: high precision machining, complicated structure, laborious operation, poor durability of machine, poor adaptability and so on. Zhang Jiao teacher trial fertilizer device in the structural principle of breaking the pump body structure to achieve quantitative injection box,