A Study of Dosage Adjustment for Pesticide Application in Vineyards

来源 :第二届植保机械与施药技术国际学术研讨会 | 被引量 : 0次 | 上传用户:whnbj
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  Traditional pesticide application in grapevines causes large losses to the air and the ground, particularly in early to mid-season application.Traditional application rates do not differ very much according to the season.Pesticide labels for vineyard sprays are based upon ground area, but growers choose different row widths, varieties and trellis designs, so canopy volume varies.Dosage adjustment, according to the fruit canopy characteristic, has been developed.In the trial described in this paper, three of them, Unit Canopy Row (UCR) (Australia), DOSAVINA (Spain and USA) and Fruit-Wall Area (FWA)(Germany and Belgium) are compared with the traditional application rates and their pros and cons are discussed.This paper presents the methodology and experimental results of the study.Sampling methods affect the results of pesticides distribution through the grape canopy significantly, due to leaf size variation within the canopy and individuals not selecting leaves from the same area of the canopy.A new tool was designed, in favor of sampling more precisely.Evaluation of the tool was carried out in the field.Two trials have done until now.Results demonstrated that at early growth stage, deposition of DOSAVINA and LWA was not different significantly from that of traditional method; deposition was not different significantly from each other among DOSAVINA, LWA and UCR, (application rate was 327,281,234 and 187 L/ha for traditional, LWA, DOSAVINA and UCR, respectively).At middle growth stage, LWA and traditional methods still achieved similar results, while deposition of DOSAVINA and UCR was not different significantly, when application rate for traditional model increased to 700 L/ha, for LWA, DOSAVINA and UCR, 560, 327 and 374 L/ha, respectively.The results shown high potential of reducing application rates using alternative models compared with traditional way, also emphasizes the importance of changing air from sprayer in terms of reducing the volume and speed by a louver system or changing the nozzle orientation.
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