The jury previously heard that Mr Marsden, who was not wearing a helmet, had not been trained on how to use the vehicle – nor had the quad bike undergone daily checks or proper tyre checks.
Jurors were told his body was found around 13:40 BST on 24 April 2020 by another contractor, Nick Miles, after he failed to return for lunch.
Paramedics confirmed he had been dead for some time.
On Thursday, at Newport Crown Court, written statements from Mr and Mrs Prest about the day of the incident were read to the jury.
Mrs Prest said she had asked Mr Marsden to spray an area of nettles and briars in a field known as Summer Field.
She said Mr Marsden took the Honda all-terrain vehicle, with a tank containing herbicide mounted on the back to the field, because it was easier than making several trips on foot.
At 10:40 BST, Mrs Prest recalled giving him a “thumbs up” as he worked on a slope, to which he waved back and then got back on the bike which was parked facing up the slope.
It was the last time she saw him alive as he was later found trapped under the quad bike, which lay across his chest.
The post-mortem confirmed he died from crush asphyxia. Toxicology tests found he was not under the influence of alcohol or drugs.
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