FAQs – Frequently asked questions and answers

Frequently asked questions about the use of Lechler nozzles and nozzle systems in agriculture and the corresponding answers can be found in the following compilation.

Overview of questions:

  • Which nozzle shall I use for the control of black-grass?

    Syngenta recommends to use a 90% drift reducing nozzle with a water volume of 200 l/ha. Boom should be kept at 50 cm height and speed shouldn´t exceed 12 km/h.

    Lechler nozzles ID3, IDK and IDKT in size 05 do all have the 90% approval from German JKI.

    For pre-emergence application to the soil, we recommend the ID3 nozzles (e.g. ID-120-05).

    For post emergence applications to cover the black-grass best possible, we recommend double flat fan nozzles like the IDKT (e.g. IDKT 120-05). The two fans, one 30° to the front and the other 30° backwards, cover the black-grass on both sides and avoid spray shadows.

    Black-grass control

  • What is meant by CV (Cross distribution)?

    CV is the coefficient of variation and describes the evenness of the liquid distribution along the boom. In some countries this is a criteria in the sprayer check and has to be below 10%.

    Lechler nozzles match the even higher performance demand of JKI approval to be below 7% at all spray heights (120° nozzle: 40 – 50 – 60 cm) and pressure settings (depending on the nozzle type; the pressure range for a nozzle type is mentioned in our catalogues).

  • 110 degree nozzles versus 120 degree nozzles – what are the benefits?

    The 120° spray angle gives a better overlap along the boom at the recommended 50 cm boom height above the target when compared to 110°.

    Therefore, the coverage and evenness of the spray is better, even there might be some variation of height during spray operation due to either boom movement or rolling field.

  • Which applications should I consider using a TWIN nozzle?

    Whenever you have to cover small vertical targets (e.g. black-grass) the double flat fan will provide you better coverage. It also helps to avoid spray shadows, this can be either small herb in post emerge application or cloddy soil. Another application is the ear wash; potato desiccation shows better results with twin nozzles, too.

    Information links: IDTA nozzle , IDKT nozzle , nozzle recommendations

  • Is a twin nozzle more likely to block compared to standard air inclusion due to the 2 smaller exit orifices, e.g. 04 twins = 2 x 02 exit orifices?

    For sure, in a twin nozzle the fan forming orifices are smaller compared to a standard fan. An 04 twin does have about 2 times 025 exit orifices.

    The amount of water, which goes through the nozzle, is determined by the dosing orifice at the top of the nozzle and not by the mouthpieces. This results from the fact that an air induction nozzle has a metering orifice, which matches the ISO size.

    The orifice to form the fan is always bigger at an air induction nozzle.

  • When should I consider using an IDTA nozzle instead of an IDKT nozzle?

    Several test results show that the symmetric double flat fan nozzle IDKT gives excellent coverage on front and back of vertical targets up to 10 / 12 km/h.

    The asymmetric fan of the IDTA gives better coverage at speeds of 10 km/h and higher.

    Information links: IDTA nozzle , IDKT nozzle

  • Are all plastic nozzles manufactured from the same material?

    Lechler plastic nozzles are manufactured from high performance POM.

    This give an excellent wear resistance as well as chemical resistance against all common used plant protection products and liquid fertilizers.

  • What is the life expectancy of a plastic nozzle compared to ceramic?

    Wear always depends on pressure and the liquid going through a nozzle.

    At higher pressure, you will have higher wear. If you spray more powder product or use water from a well, there are more small particles in which will cause more abrasion.

    Several field tests show that the lifetime of a ceramic tip can easily be 2 to 3 times more compared to plastic.

  • Lechler FD nozzles are "fan" type nozzles – are these nozzles more likely to cause crop damage in comparison to dribble bars or stream type nozzles?

    The droplet spectrum of the Lechler FD fertilizer nozzle is extreme coarse and comparable to the drop size of stream nozzles.

    The main advantage of FD is to release the droplets almost horizontal at a low pressure, so they fall into the canopy just like rain by gravity. This is an important advantage when applying liquid fertilizer. Often times scorch is caused by mechanical damage of the waxy layer due to high kinetic energy and impact in the droplet or stream. This even more if application takes place after a rainy period or when there is a lot of dew in the canopy, which weakens the waxy layer.

    For late fertilizer applications when the crop is already big (e.g. late application in cereals), it is recommendable to use a hose drop system like 5S and 5SL or the DroplegUL. With those systems, damage can be avoided because the fertilizer is applied into the canopy and not on the top of the crops.

    Information links: FD nozzle , nozzle recommendations