It's interesting that 10 litres can water 12 tom plants. Are they in mini pots?
Not water, just liquid feed. They're on a drip system for water (10 mins twice a day at the moment). They're in tomato buckets (quite tall but on the narrow side) that were given to me by an elderly neighbour 30-odd years ago. I can't seem to get any more though, it seems to be all grobags or wide pots.
Doncaster, South Yorkshire. Soil type: sandy, well-drained
Here we buy horseradish and sausage skins in tiny little clear plastic pots, so I measure out the amount I need in water using the scales and draw a line on the pot, clearly marking that the pot is NOT for food use. that then gets thrown into the 12 L watering can, so I make sure the mark is right for 12L
There is absolutely no need to provide individual plants with a precise amount of water and feed. As has been said, put the required amount of feed into a watering can, top up with water and put it on the plants.
The amount you use on each plant, depends on the plant and where it's growing. You wouldn't use the same amount on some small annuals in a ten inch pot, compared to a large, mature clematis, or a hefty tomato.
It's a place where beautiful isn't enough of a word....
I live in west central Scotland - not where that photo is...
I have a line in old black bin that is 40 Lt fill to that then add the feed, mix and then dunk the watering can in and feed out to plants. I don't measure it out just work on 8 feeds per watering can. I do wear marigolds gloves to protect my skin as the fertilizer burns but I find this my quickest method when I've lots to do.
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You wouldn't use the same amount on some small annuals in a ten inch pot, compared to a large, mature clematis, or a hefty tomato.
I live in west central Scotland - not where that photo is...