Tell her that the chicken poop will acctually make your plants grow better. Its true. Its good fertalizer. And if your letting them free roam you wont have to feed them as much. But I wouldnt suggest that cause preditors could get them very easily. If you just section off a part with some chicken wire, put a top cover over it, or perhaps make a chicken tractor, you can easily keep your yard healthy. You can look for some examples of a chicken tractors on this site.
Also. You should tell your wife that your a grown man now and if it was something dangerous or hurtful to the family's well being, then you could understand her saying no. Just get what you want. Don't let your wife treat you like a child. Thats just my two cents. A marriage is suppose to be equal. You can't keep letting her make all the decisions. Or else you will just be misrable and want to leave her in the future. If she won't let you have a freaking chicken then what else will she decide for you later on in life?
Also. You should tell your wife that your a grown man now and if it was something dangerous or hurtful to the family's well being, then you could understand her saying no. Just get what you want. Don't let your wife treat you like a child. Thats just my two cents. A marriage is suppose to be equal. You can't keep letting her make all the decisions. Or else you will just be misrable and want to leave her in the future. If she won't let you have a freaking chicken then what else will she decide for you later on in life?