Farmer spreading yellow grit like powder - any ideas what it is

Hi, Our garden is surrounded by fields and today a contractor has been spreading a yellow grit like substance on the fields. It isn't one I have seen before but I assume it is some form of fertiliser. I only ask because it has sprayed onto my veg patch and our grass and I want to know it will not do any harm.

It was like the green one.

Then the chances that it was fertiliser are high and if it was gypsum then its just used to improve crop quality of carrots  

Sorry I meant the bottom green spreader. a large square hopper. It has been spread on both grass and newly ploughed fields. Just curious because it isn't one I have seen before.

Sounds like ground limestone to me and will do no harm. Pick some up and see if it dissolves in water. Fertiliser will, lime will not.

I am sure that the farmer or the tractor driver will tell you what it is. He may be on the defensive so be polite. He should not be spreading it on your garden anyway

ask him if it's volcanic ash.

 

He may indeed be on the defensive, however "overspray" is quite serious. He has a responsibility to ensure that whatever he is spraying does not make it into your garden.