You already got some good advice. I just want to add, that you seem to have a good eye for photo opportunities and your compositions are mainly quite good. I also noted that going into shade your pictures became blueish. you can correct that by setting your white balance for shade or shoot in auto white balance, which works fairly well in most situations and correct any color problem in post processing. I would recommend that you buy Adobe's Elements. Is a very good editing program, that is easy to use and is fairly inexpensive, but really quite versatile.

Can I just say "Welcome"! Ah, hey, for the record, if you like them they are great no matter what any body else says. Some photos simply need some post production work on them. Even MicroSoft picture editor can change the contrast and exposure. If you need to use it use it. I say they were all good and all had good points.
The tree was good.
The shot with the tractor could have used a change in comp. maybe.( a step to the right) I wanted to see the tractor.
Loved the rain flowers and the barn; good color.
The chickens were over exposed but that is so easy to fix.
The fence is perfect. Try getting the whole thing in focus!(just a thought)
The daylily looks good.
So, all in all the colors looked natural, you did great!
I am looking forward to seeing your work develop in the future!
Again Welcome to UHH.

-Terry