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Liquid feeds act faster but don't release over a long period so require more applications, I use them both in conjunction as and when required.
I tried liquid feed a couple of years ago, mainly for more accurate application on odd-shaped lawns. Have to say I wasn't impressed! I did everything to the letter, but I really think that the lawn needs to be completely soaked with the mixture to make any difference, I.e the knapsack sprayer simply couldn't deliver enough liquid to make the process effective.
I've since gone back to granular and let the rain do the work! So much better!
Granular, coated fertilisers are those of choice from the majority of UKLCA members. Their longevity means year-round nutrition can be delivered across 3-5 applications.
Application is easier, less water is required on vans, and it's more cost effective for the customer requiring 5 visits per year rather than 12, for example.
Of course, liquids have their place if a quick pick-up is needed, and Fe is often preferred in liquid form. Granular provides the foundations in lawn care for sure.
We interchangeably use both and have good results with both. Not sure about the comment about a knapsack sprayer not being able to deliver enough flow - that sounds like a nozzle/calibration issue to me. From memory, we use a flat fan (high output) white nozzle.
There are long lasting liquid feeds out there from some suppliers which we use for anywhere that there are children/dogs/public access etc.
We have a few 'bases' in terms of granular feed (coated) post scarifying or renovation but its easy to get caught out with the weather.
Liquids are also sometimes used for a 'post scarifying mop up' with a heavy dose of iron included.
Horses for courses really - theres a place for both.
My understanding was you can't easily put down nutrients in large quantities with liquid feeds - possibly why some have seen poor results. To get desired amounts of Nitrogen etc down you need granular. Liquid is just a light snack and granular is a proper meal so to speak. I use liquid when I think a little tonic is needed between feeds.
Controlled release as apposed to slow release would be my preferred method. When temperature and moisture coincide for optimum growth it releases the nutrient. G
We use granular Evergreen 4 in 1 which we get at a very good prive of £13.99 for a 400 Sq Mtr bag.
Using granuals is so much eaiser to use than having to carry a load of water cans.
We don't use granulated weedkillers as they are not as effective as liquid weedkillers, plus the liquid weedkillers can be applied more accurately or used for spot treatments
Agreed, plus a bit of fertiliser spilling over onto a shrub/plant/border isn't the end of the world. Difficult to prevent with an all-in-one.