NEW YORK ( TheStreet) -- In the last few years investors have gained a new awareness of the agriculture investment theme.This sector has benefited from the recent overall lift in commodity prices and from improving diets in many emerging-market nations. The go-to exchange-traded fund for this theme has been the Market Vectors Agribusiness ETF ( MOO), but that might be changing. There have been other ETFs that are very similar to MOO, but last week a different kind of agriculture fund made its debut: the IndexIQ Global Agribusiness Small Cap ETF ( CROP). Since most investors interested in agriculture are familiar with the Market Vectors Agribusiness ETF, it's worth comparing it to the new IndexIQ fund. The biggest difference is obviously the market capitalization of the stocks in the two funds. The Market Vectors fund's 45 holdings are dominated by very familiar names like Deere ( DE), Monsanto ( MON) and Potash Corp of Saskatchewan ( POT). Each has a weighting of more than 8%. The IndexIQ fund's top holdings are similarly weighted, but they're lesser-known names such as Viterra (VT:TO), Tractor Supply ( TSCO) and Smithfield Foods ( SFD). At the industry level, CROP allocates 25% to agricultural supplies, 24% to agricultural machinery, 20% to livestock, 16% to crop production and farming, 8% to biofuels and 7% to chemicals. MOO, on the other hand, allocates much more of its portfolio to chemicals, with a weighting of 44%. It allocates only 8.5% to livestock operations, because many of the publicly traded farming companies are very small. Investors looking for more farm exposure but who are uncomfortable picking stocks in this niche would be better off with CROP than MOO. (On a related note, Global X has filed for a farming ETF, which I will write about if it ever starts trading.) The IndexIQ fund has 52 holdings. At the country level, its heaviest weighting is the U.S. at 24%, followed by Hong Kong/China at 19%, Japan at 14% and Canada at 9%. Other countries have much smaller weightings. The expense ratio is 0.75%, which might seem expensive, but the fund owns many small-cap stocks traded on foreign markets and accessing them is not cheap. The yield of the index was 1.57% as of mid-March so after accounting for the fee, the fund might yield 0.80%.