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How to measure a lawn

Grassclippings - Measuring a LawnKnowing the size of your lawn is vital should you wish to care for it correctly.

Measuring a lawn is so important when making an assessment on how much fertiliser to buy and then ensure that you have applied the correct amount of product over the given area and this applies to granules and liquids.

The ultimate aim is to arrive at the total number of square metres of the lawn or each lawn and the total of all of the lawns making up the garden.

A quick way of measuring is to simply stride down each lawn and then across each lawn. Make a note of the total number of strides each way and then multiply the two figures you have written down together. For example 10 strides up or down by 10 strides across will equal approx 100 square yards total as a stride is roughly one good stride in a John Cleese kind of walk!

A yard is approx 0.9 metres so 100 square yards would be 90 square metres. If you have curves and non square or rectangle lawns that would make measuring difficult, simple 'square' the lawn up into little sections and the measure these down and across and total up the individual areas to make a 'whole'. If the lawn looks like an hour glass or May West’s waist, measure across the lawn say every two or three metres down and 'slice' the lawn up measuring the distance across the lawn's surface every two or three metres.

Making selective weed killer or fertiliser applications to the lawn is very much a calibrated process to ensure measured results. Selective herbicides will be applied at a given concentrate amount or dose rate in a given water volume per a given area. For example written as 5 litres in 200 litres of water over a hectare - which is 10,000 square metres or 2.4 acres in old money. Granular fertilisers will be applied at say 30 - 35 grams per square metre or 350 Kg per hectare.

A good quick calculation method on determining how much product per a given area -

Liquids - take the chemical dose rate from the product label and divide it by 10,000 (number of square metres in a hectare) and multiply by the known and just measured total area of the lawn, which will be in square metres (sqm). This will give you the amount of actual chemical product for the complete lawn area or job. Then take the recommended water volume that the active ingredient is mixed with so let's say 200 litres of water per hectare. Divide the 200 by 10,000 and multiply this by the known lawn area and you will end up with the amount of water to be applied over the given area of lawn or job. Taking the two figures, you now know how much chemical and water for the lawn. For example a selective herbicide may say 3 litres per hectare (Ha) in 200 litres of water per hectare. You have a 500 square metre lawn (sqm) that needs treating. Divide the chemical dose rate of 3 by 10,000 and multiply by the lawn area of 500 sqm = 0.15 litres or 150ml. For the water volume divide 200lts by 10,000 and multiply by the lawn area of 500 sqm to arrive at 10 Litres. The answer is 1.5 lts of chemical in 10 lts of water per 500 sqm of lawn. Apply too much, you will not get the best results, apply too little - the same applies!

For granular products take the measured lawn area, multiply by the application rate shown on the label let's say 30 grams per square metre (sqm) and divide this by 1,000 (number of grams in a kilogram) to arrive at the number of Kilograms of product for the lawn area. For example 800 sqm lawn x 30 grams per sqm divided by 1,000 = 24 Kg of product or 1.25 bags if the product comes in 20 Kg bags.

To convert from acres to hectares, multiply the acreage figure by 0.404 to get the number or percentage of hectares. For example 6 acres x 0.404 = 2.42 hectares or 24,200 square metres!

One foot in length is 0.348 metres. One square foot is 0.009 square metres.

Phew! Just in case you need some more indepth information on measuring lawns and gardens, this a really useful Download Measuring a Lawn on the subject.

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