Within the context of the authorization of plant protection products, drift endpoints are used since 1995 to assess the effects of PPPs on non-target organisms and to set use instructions. Results from 119 drift studies from 1989 to 1992 have served to calculate the 95th percentile. Rounding up the 95th percentile to 1 position after the comma has resulted in the endpoints. Additionally, more tests have been done in field crops and orchards from 1996 to 1999. These tests were conducted with improved measurement technology, allowing accurate measuring points 10 times below the previous results. Hence, soil sediments values inferior to 0.01% of the application dosage could be measures, values sometimes found at higher distances. As a result, the JKI would measures at higher distances (up to 100m) from treated fields and obtain more accurate assessments on the drift curve.
German authorities responsible for product authorization have, in alignment with the FOCUS group (Surface Water Scenario Group), agreed an approach considering the 90th percentile instead of the 95th percentile.
In contrast to vineyards, drift end points in orchards would distinguish between early and late growth phases. The reason is that depending on growth pace there would be significant differences in drift levels, because of lead density.
For special use areas such as home and garden, railways or other crops treated with water values > 900 l/ha, there are additional drift values.
All drift endpoints are published in the "Bundesanzeiger".
The drift endpoints can be found here.
Applicants must provide results from field tests (JKI Guideline 7-1.5) or wind channel (ISO 22856). The procedure to get a drift reducing equipment item listed as such is described in the JKI Guideline 2-2.1.
JKI also tests pesticide application equipment with regard to its potential to limit use quantities (JKI Guideline 2-3.1) and if positive, the equipment would be listed as such.
(source: website of the Julius Kühne Institut)
More information on the way drift reducing nozzles are tested to be approved for the nationally approved list of drift reducing technology can be found here.
Use of drift reducing equipment
Drift reducing equipment and nozzles are listed in the list “Verlustmindernde Geräte”. These lists contain information on the use conditions, that is, under which circumstances the indicated drift reduction is achieved. These tables are to provide an overview including pressure, use quantities etc.
At field edges special edge nozzles approved by JKI should be used or alternatively, the outer nozzles should be shut down when spraying edges, minimizing the so-called “overspray”.
Even if there are no specific use instructions drift reducing nozzles should be used. Close to houses, gardens or persons a minimum distance of 2 m is to be observed, independently of the used nozzles or equipment.
Often use conditions are set that are a combination of the use of drift reducting technology and safety distances. In these cases it should be noted that the safety distance/ edge zone in the list “Verlustmindernde Geräte” is to be added to the non-treated zones .
Example: application of PPP with the following use instructions: 90% drift reduction a, 20m edge zone and 20m non treated zone.
Various buffer zone widths
The NW 605 specification provides the distances to be kept with regard to water bodies. These vary according to the product. In general, the following rules apply:
With 50-75% drift reducing nozzles a non-treated strip of 5 m must be observed. In addition, an other strip of 20m must be treated with minimum 50 or 75% drift reduction nozzles, At a distance of 25 m from the upper bank edge the drift reduction specifications are no longer mandatory.
Source: So bleiben Sie auf Abstand. Topagrar.com.