First I look for a dense spot of cut hay, gather up some and flip it over. Look for hay that has not dried, Pick up some and twist. Should break easily if ready. After it is torn, look at the stem for sign of moisture. Also, dry hay will make a rustling, crackling sound when you handle it.
Bale a few and look at the rollers and belts on the baler to see if they are clean or have hay sticking to them. I also have a moisture tester that I will use to check moisture on a bale if weather is threatening and I don't like the look of the hay. Green square bales will be like a block of cement.
The worst clue you get that the hay is green is when you have to dig a core out of the baler because a belt fipped. :???: :lol2: :mad: :help: