Vieira Bruno C, Butts Thomas R, Rodrigues Andre O, Golus Jeffrey A, Schroeder Kasey, Kruger Greg R
West Central Research and Extension Center, University of Nebraska-Lincoln, North Platte, NE, USA.
Pest Manag Sci. 2018 Apr 24. doi: 10.1002/ps.5041.
Herbicide particle drift reduces application efficacy and can cause severe impacts on nearby vegetation depending on the herbicide mode of action, exposure level, and tolerance to the herbicide. A particle drift mitigation effort placing windbreaks or barriers on the field boundaries to reduce off-target movement of spray particles has been utilized in the past. The objective of this research was to evaluate the effectiveness of field corn (Zea mays L.) at different heights as a particle drift barrier.
Applications with a non-air inclusion flat fan nozzle (ER11004) resulted in greater particle drift when compared with an air inclusion nozzle (TTI11004). Eight rows of corn were used as barriers (0.91, 1.22, and 1.98 m height) which reduced the particle drift for both nozzles, especially at shorter downwind distances. Applications with the ER11004 nozzle without corn barriers had 1% of the applied rate (D ) predicted to deposit at 14.8 m downwind, whereas this distance was reduced (up to 7-fold) when applications were performed with corn barriers. The combination of corn drift barriers and nozzle selection (TTI11004) provided satisfactory particle drift reduction when the D estimates were compared with those for applications with the ER11004 nozzle without corn barriers (up to 10-fold difference).
The corn drift barriers were effective in reducing particle drift from applications with the ER11004 and the TTI11004 nozzles (Fine and Ultra Coarse spray classifications, respectively). The corn drift barrier had appropriate porosity and width as the airborne spray was captured within its canopy instead of deflecting up and over it. © 2018 Society of Chemical Industry.
除草剂颗粒漂移会降低施用效果，并可能根据除草剂的作用方式、暴露水平和对除草剂的耐受性对附近植被造成严重影响。过去曾采用在田间边界设置防风带或屏障以减少喷雾颗粒非靶标移动的颗粒漂移缓解措施。本研究的目的是评估不同高度的大田玉米（Zea mays L.）作为颗粒漂移屏障的有效性。
与空气混入式喷头（TTI11004）相比，使用非空气混入式扁平扇形喷头（ER11004）进行喷雾时会导致更多的颗粒漂移。八行玉米用作屏障（高度分别为0.91、1.22和1.98米），这两种喷头的颗粒漂移都减少了，尤其是在顺风距离较短时。使用ER11004喷头且无玉米屏障时，预计施用量的1%（D）会在顺风14.8米处沉积，而在有玉米屏障进行喷雾时，此距离缩短了（最多7倍）。将玉米漂移屏障与喷头选择（TTI11004）相结合，与使用无玉米屏障的ER11004喷头进行喷雾时的D估计值相比，能提供令人满意的颗粒漂移减少效果（相差最多10倍）。
玉米漂移屏障可有效减少使用ER11004和TTI11004喷头（分别为细喷雾和超粗喷雾类别）喷雾时的颗粒漂移。玉米漂移屏障具有合适的孔隙率和宽度，因为空气中的喷雾被截留在其冠层内，而不是向上偏转越过它。© 2018化学工业协会。
