Studies On Spray Deposition Uniformity And Droplet Deposition And The Control Effect To Rice Planthopper Of Two New Types Of Spray Lance Spraying On Rice

There are many types of crop disease and pests, serious harm, have caused damages to world agricultural production. Therefore, pest management is the critical parts of agricultural production. The preventing and controlling methods include cultural control, physical control, biological control and chemical control. At present, chemical control is the most common and efficient way. Due to the basic requirement of modern agriculture and the new village construction, a larger explosion of harmful organisms, the existing rural labors tend to be older or poorly educated. The traditional prevention and treatment measure which at the household level rarely suffices pest management.Specialized control is making fundamental reform and innovation to traditional prevention and treatment measure. In recent years, boosted by central government and all levels of government, specialized control has also been a good development and achieved some results successively.In this study, we use 3WZ-34 series push-portable-motor driven sprayer which is the special equipment of specialized control with use of the new manpower spray lance and the new long-distance and wide-size spray lance. Determine the parameters of the droplets, including the spectrum of fog particles, flow, sprinkling breadth and the best travel speed in the field. Also determine spray deposition uniformity and The deposit amount of fogdrops. And determine the control efficacy to rice planthopper. Use the long-distance and wide-size spray lance and hand sprayer as the control. Result:1. Compared spraying performance of sprayers under different ambient pressure, the best ambient pressures were:the new manpower spray lance(8m)was 1MPa,the new long-distance and wide-size spray lance was 4MPa,the long-distance and wide-size spray lance was 3MPa.2. The VMD of several sprayers were:the new manpower spray lance(47.19μm) <the new long-distance and wide-size spray lance (51.77μm)<the long-distance and wide-size spray lance (122.4μm)<hand sprayer (148.2μm). VMDs of the new manpower spray lance and the new long-distance and wide-size spray lance apparently lower than the other three sprayers, and the spectrum of fog particles is quite narrow.3. Determine spray deposition uniformity and the deposit amount of fogdrops. The experimental results demonstrate that fogdrops sprayed by the new manpower spray lance and the new long-distance and wide-size spray lance deposition uniformity was good, and had a higher deposit amount of fogdrops on the surface of the leaves.4. By control experiments to rice planthopper, results showed that the mortality rate of every sprayer accounts for 90%or more, the effect of the new long-distance and wide-size spray lance was the best, up to 97.2%.