Commodity stocks are returning to favor with investors for a variety of reasons. Some like the reliable dividends of major energy producers. Others like the stable revenue stream provided by raw materials stocks even when consumer spending may be weak. And then there are the macro investors who anticipate a surge in certain commodities such as crude oil or gold, and nice profits for stocks in those sectors.

Whatever your motivation to seek out commodity stocks, these investments can be an important part of diversifying your portfolio and keeping your risks low in a volatile market. To help you pick the best commodity investments as the market starts to gear up this September, here are some InvestorPlace experts with their top seven commodity picks:

Commodity Pick 1 - Agribusiness ETF

Recommended by: Richard Young, editor of Intelligence Report

Strategy: Bedrock investments for the long term

The Market Vectors Agribusiness ETF ( MOO) is a great long-term commodity investment. After all the hubbub in the agriculture sector when BHP Billiton ( BHP) made a hostile move to take over Potash ( POT), Wall Street is anticipating buyouts in the sector as well as general strength for the agriculture industry. Corn and wheat prices remain high, guaranteeing big margins for crop producers. What's more, these producers keep using more and more fertilizer, weed killer and genetically modified seeds to bump up their harvests -- meaning related industries are red hot. Even when consumer spending is weak, these stocks will thrive seeing as everyone needs to eat. The MOO ETF is the best way to play the agriculture sector's strength, reducing your risk with diversification instead of relying on a single stock.

Commodity Pick 2 - Gold Trust ETF

Recommended by: Robert Hsu, editor of China Strategy

Strategy: Trading to profit from Asia's economic boom

One of the best buys you can make this month is the SPDR Gold Trust ETF ( GLD), the best pure way to play the bull market in gold. Based on its technical chart pattern, gold looks like it has another leg up -- and is quickly closing in on the June high of 1,271. If gold breaks through that mark, the sky could be the limit. That said, there is only so much upside we can see in gold in the next few months or years so please only buy GLD under $125. If you pay more than that, you will have missed the ideal entry point. As of this week though we're still under that mark so get into SPDR Gold Trust ETF shares while you can.

Commodity Pick 3 - Mesabi Trust

Recommended by: Louis Navellier, editor of Emerging Growth

Strategy: Small-cap investing with a focus on fundamentals

Mesabi Trust ( MSB) leases mining operations in the Mesabi Mining Range located in Silver Bay, Minn, and provides iron ore products to the steel industry. Production has picked up tremendously in recent months, which has greatly increased investor interest in this stock. What's more, income investors are pleased because Mesabi Trust paid an incredible $0.80 dividend in its latest quarter, bringing its annual dividend yield to 12.6%! In its most recent quarter, Mesabi's revenue rose +67.1% and its earnings rose a whopping +500% so there is a lot of reason to get excited about this small-cap. If iron prices go up, expect even bigger profits from MSB.

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