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Why is my earth a green colour?
Morning all. I’ve sown grass seed recently and it’s coming on nicely. I have noticed though that the earth is green. Is this a drainage issue?. If so how can I prevent it, assuming it’s undesirable.

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In the sticks near Peterborough
I kill moss and algae by watering a solution of 6 dessertspoons of Sulphate of Iron (ferrous sulphate) in a 1.5 gallon watering can. When it is dead, rake it up. I have never tried it on young grass.
The drainage issue should be dealt with as well. At least local spiking, perhaps more.
"Have nothing in your garden that you don't know to be useful, or believe to be beautiful."
Over time your soil will go sour if it remains in that condition and not much will grow there.
You could try the test below to see how bad it is, but it's obviously quite bad from the photo.
https://www.drainagesuperstore.co.uk/help-and-advice/project-guides/underground-drainage/how-to-carry-out-a-soil-percolation-test/
Scroll down to this bit-
How do I carry out a soil percolation test?
Billericay - Essex
Knowledge is knowing that a tomato is a fruit.
Wisdom is not putting it in a fruit salad.
Stand on it to sink the tines as deep as they'll go and then wiggle back and forth to open up the holes. Repeat every few inches working backwards over you soil so you don't compact new holes. Leave it all alone for a week or two - keep off the grass - and see if the water drains.
If it does you can pile on sharp sand (not builders') and then brush it across and into all those holes so they stay open and allow air to get to the roots and water to drain. repeat the aeration and sand every spring and autumn toll the lawn stops flooding.
If the water doesn't drain away you have a serious drainage problem which needs a serious solution or you could abandon the lawn and create a bog garden.