Comparative test for the air-velocity of several pesticide spraying equipments

In order to study the air -velocity distribution characteristic and its influences of different spraying equipments, and to reveal the principle to increase airflow range and spraying efficiency, a comparative test was carried out for the air-velocity of 4 kinds of plant protection equipments, including spraying and dusting machine (SDM), air-assisted sprayer (AAS), thermal fogger (TF) and aero-pipeline spraying machine (APSM). The results showed that there was significant difference in air-velocity among the 4 kinds of plant protection equipments. Air -velocity attenuation ratio (AVAR) of APSM was the smallest, the air-velocity was about 7 m/s around the spraying hole, even located 40 m from the entrance of pipeline. The difference between SDM and AAS was not significant. The TF was the weakest in air-velocity. The comparative test indicates that APSM is one of the most effective methods to widen single spraying coverage. The airflow range can be increased greatly by using pipeline to constrain and guide airflow, and then results in improving spraying efficiency, reducing waste of resources and pollution of pesticides on farmland environment, promoting sustainable development of agriculture and guaranteeing the safety of crop production.