Wondering what are those patches and so many of them on the field...
It's actually spider webs!
A closer zoom in. Each patch has a spider on it.
In the afternoon, the field has no webs at all, but by evening, all the spiders have spun their web. This was taken around 6:45 this evening.
Sorry, the photos are not very clear, I did not take my time, I just snap and rushed off because I was late! haha..