NEW YORK ( TheStreet) -- Last week, I made the case that farmland is an asset class, and one that I consider to be an important piece of my portfolio. Even though there aren't many publicly traded agriculture plays, over the years, I've discovered and purchased a handful. A conversation with a colleague yesterday, who buys and manages farms in the western U.S. as investments, was a great reminder of why farmland can be such an important part of a portfolio: diversification benefits. Historically farmland has been positively correlated with inflation, so it is an inflation hedge, but over long periods of time it has been negatively correlated with equities. In other words, the diversification benefits can be huge, in an era when correlations among many asset classes are very high. Of course, owning publicly traded companies that own farmland still exposes you to the equity markets, but short of going out and buying land, these companies are as close as many investors can get -- at this point, anyway -- to farmland exposure. One of the more interesting farmland plays that I own is Argentine company Cresud ( CRESY). As of March 31, the company managed 34 farms with a total of more than 2.3 million acres of land. For perspective, that's the equivalent of 3,700 square miles, an area that is roughly two-thirds the size of Connecticut. Nearly two-thirds of the land is located in Argentina, with 19% in Brazil, 13% in Paraguay, and 2% in Bolivia. CRESY data by YCharts Cresud's market cap is just $431 million, but the company has about $1 billion in debt, for a total enterprise value of about $1.3 billion. Considering the company's assets, that is a small enterprise value. In addition to its other assets, Cresud also owns 64.5% of Argentine real estate company IRSA ( IRS), which currently has a market cap of $540 million. That puts the value of Cresud's IRS stake at $348 million. The company also owns 40% of BrasilAgro ( LND), worth about $100 million. The natural question is why a company with such a vast array of assets has such a small market cap, and the answer is location.