"There are many reasons to like the PowerShares DB Agriculture (NYSE: DBA), an exchange-traded fund that tracks agricultural commodity prices," says fund expert Doug Fabian.

In The ETF Trader, he explains, "We like the technical picture. In addition, we believe commodities are a great hedge against inflation.

"Overall, we like the patterns taking shape in the world's key agricultural crops. The price charts of crops like corn, soybeans, sugar and wheat all have given us one compelling message, and that message is it's time to buy.

Is it time to ride the rails? In Gordon Pape's The Internet Wealth Builder, analyst Tom Slee reaffirms his buy rating on Burlington Northern Santa Fe (NYSE: BNI), his top pick in the sector.

"Burlington Northern is my preferred choice in the railroad industry. At first glance, Burlington Northern had a particularly bad first quarter.

"Profit was $0.86 a share, down sharply from $1.30 a share the year before. However, when unusual items such as an unfavourable coal rate decision are excluded, operating earnings amounted to a much more acceptable $1.13 a share, well above the 96c analysts were looking for.

Regarding the "agricultural boom," Kevin Kerr notes, "Green Acres is still the place to be." Here, the editor of MarketWatch Global Resources looks at Archer Daniels Midland (NYSE: ADM).

Kerr explains, "Our portfolio has already seen some big gains from the agriculture, and we are getting ready to position ourselves for even more gains. How long will the boom last? The honest, albeit unsatisfying, answer is that nobody knows."

The advisor continues, "Growing interest is a good indicator that the grain markets have a good bit of wind at their back. Indicators suggest that we are seeing good momentum in the grain market investment vehicles and likely will for many years to come.

"Meanwhile, there are some key differences about the agricultural trading boom as compared to say the high tech stock frenzy. After all, food, unlike high tech stocks, is not only high in demand; it still remains way undervalued even at current record levels."