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Nozzle classification system in Japan based on the relative spray ...

Nozzle classification system in Japan based on the relative spray ...

Nozzle classification system in Japan based on the relative spray

ong>Nozzleong> ong>classificationong> ong>systemong> ong>inong> ong>Japanong> ong>basedong> on the relative spray drift potential Geng Bai 1 , Kazuhiro Nakano 1 *, Tomomichi Mizukami 2 , Sumihiko Miyahara 2 , Shong>inong>taroh Ohashi 1 , Ken-ichi Takizawa 1 , Haijun Yan 3 1 Graduate School of Science and Technology, Niigata University, Ikarashi 2-8050 Nishi-ku, Niigata 950-2181, ong>Japanong> 2 Institute of Agricultural Machong>inong>ery, 1-40-2 Nisshong>inong>, Kita-ku, Saitama 331-8537, ong>Japanong> 3 College of Water Resources and Civil Engong>inong>eerong>inong>g, Chong>inong>a Agricultural University, No. 17 Tsong>inong>ghua East Road, Beijong>inong>g 100083, Chong>inong>a *Correspondong>inong>g author. Email: knakano@agr.niigata-u.ac.jp Abstract European spray nozzle drift ong>classificationong>s have made the objective evaluations of the drift reduction performance with different nozzle and operatong>inong>g parameters available ong>inong> certaong>inong> areas. Drift Potential Index Reduction Percentage (DIXRP) of one series of drift reduction nozzles usong>inong>g ong>inong> ong>Japanong> were ong>inong>vestigated by the wong>inong>d tunnel test. Based on the reference spray, most of the YAMAHO KIRINASHI ES nozzles had good DIXRP values above 50% under ong>inong>vestigated conditions. Additionally, DIXRP values were above 80% when the nozzle height was 0.3m except ES05. The large droplet diameter, the high droplet velocity and the low recommended nozzle height could be considered as important factors that can achieve the good performance of drift reduction ability. Besides, the DIXRP value was proportional to the nozzle size and ong>inong>versely proportional to the nozzle height. The relationship between DIXRP value and the nozzle pressure was not obvious. Key words: drift, ong>classificationong>, nozzle, wong>inong>d tunnel 1. Introduction The spray drift of the agricultural sprayers has been attracted much attention ong>inong> ong>Japanong> because of the ong>inong>fluence on neighborong>inong>g residents, pollution of the nearby crops and contamong>inong>ation of the adjacent water (ong>Japanong> Plant Protection Association, 2009). The measurement of the relative drift potential by the wong>inong>d tunnel test was proved to be a valuable alternative to the field measurement of the drift potential for evaluatong>inong>g the drift reducong>inong>g performance of the spray nozzles (Nuyttens et al., 2010). Comparong>inong>g to the field drift experiment which could evaluate the drift reduction performance of the whole spray ong>systemong>, the wong>inong>d tunnel test provides a repeatable and economical way to measure the relative drift reduction capacities of the nozzles under different nozzle types, sizes, pressures, heights and wong>inong>d speeds. However, from the literature cited (ong>Japanong> Plant Protection Association, 2009), the wong>inong>d tunnel test mentioned above has not been carried out ong>inong> ong>Japanong> where the operatong>inong>g

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