If you liked the Chihayafuru anime, the Anime-Planet community thinks you'd like:
The studious and uptight Chiaki is well-known as the top pianist of his school, and dreams of becoming a world-class conductor like his idol, Viera; but his fear of flying (which makes studying abroad impossible) combined with a recent break-up and dismissal from his piano instructor causes that future to seem both bleak and unlikely. After collapsing outside of his apartment, drunk, Chiaki inadvertently meets a young woman named Nodame who, while quite talented at the piano, is unclean, clumsy, and haphazard. Despite being almost polar opposites, the two begin to grow closer and work, together, to overcome the obstacles in their careers.
Another josei series about another eccentric girl completely devoted to her hobby/sport/instrument. There's a bit of romance, a diverse cast, and a very in-depth, yet accessable look into the subject matter. The main difference is that I (and probably most other people) find music much more interesting than karuta, so Nodame Cantabile ends up being a more rewarding viewing experience, whereas Chihayafuru gets bogged down by epidode after episode of matches of a card game that I'm only sort-of interested in.
When Yuugo Hachiken enrolled at Ezonoo, an agricultural high school, he had no idea what he was getting himself into. While his classmates revel in the barnyard chores and hard labor, eager to gain skills for their careers, Yuugo is challenged and sometimes downright horrified by the things he’s having to learn, whether he’s corralling stray cows, learning the shocking truth of where chicken eggs come from, or even getting comfortable with riding a horse! Alongside peers such as the lovely Aki, Yuugo will learn all he can about agriculture, making close friends in the process.
Two very different animes, but both have a unusual theme. In Silver Spoon this theme is Agriculture, in Chihayafuru it's all about Karuta. Both slice of life anime have a very similar tone to them, that make you just want to smile along while watching it. They also have the same level of comedy. So if you liked the unique theme in one, you might like the other.