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Converting fertiliser application rates

Evening gang, I'm just looking at some liquid fertilisers and having forgotten most of my gcse maths can't convert the application rates from l/hectare to more sensible figures for knapsack application. Is there a formula to use? The product I'm looking at is

Application Rate: 30 - 120 l/ha

Water Rate: 300-1000 l/ha

Any help much appreciated, thanks. 

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  • PRO

    So, you'll need to calibrate yourself to your knapsack so that you know how much you'll typically get from a tank - I get 500sqm out of my Berthoud with twin white flatfan nozzles so lets use that as it's a nice round number.

    Also, decide on the application rate, 30 to 120 is quite a rate. Often with liquids, I'll use 80L / Ha.

    So, that's 80L / 10000 sqm or 8L per 1000 sqm, or 4L per 500sqm (just divide down). You could just divide the application rate by 20 to get this (10000 divide by 500)

    So 4L per tank. Then you check the water rate is correct & in the band above. So say 20L / tank ie 20L for 500sqm, or 40L for 1000sqm or 400L for 10000 sqm. This sits within the water rate above. So all good.

  • 30 - 120 ml/m2 of product, this is the important figure. How much water you use to disperse it is down to you and your equipment, I like to give the grass a good soak. For example, on a 100 m2 lawn I’d use between 300ml and 1.2l of product ( dependant on what I was trying to achieve) and typically 20l of water (normally 2 x 10l knapsacks).

    Hope that helps.

  • PRO

    Sean, The water rate is important as it set dilutions and hence take up on the leaf. Using 20L for 100sqm equates to 200L/1000sqm or 2000L/Ha. This is outside the product parameters and so should be avoided.

    • Indeed, I should have made it clear that this was typical for the product I use and not for the one in Glen is using.

  • Thanks guys 

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