From the stock market to commercial real estate, there are now plenty of great ways to diversify your investment portfolio. Lately, farmland investments have been gaining in popularity among accredited investors.Why would anyone want to invest in farmland?As it turns out, the world of agriculture is full of interesting alternative investments, many of which come with a unique set of perks. As an asset class, farmland offers low volatility and the potential to achieve respectable capital gains. While it tends to be a pretty long-term investment, it can also be a nice way to generate passive income throughout the holding period.