Instead, the biggest effect on agriculture investing is the improving living standards and changing food habits of the populations of emerging and developing countries.

Jake Robbins, manager of the Premier Global Alpha Growth fund, says: “As people become wealthier they are shifting their diet from basic crops, such as rice and potatoes, and eating a lot of meat. So as the demand for meat rises the demand for crops rises almost exponentially.

“That is the biggest driver. We saw in 2007-08 that when supply cannot meet demand, you get huge spikes in the price of crops and meat.”

Skye Macpherson, portfolio manager, global resources at First State Investments, agrees that this trend is leading to increased demand for many agricultural commodities such as dairy, sugar and meat.

She adds: “Interestingly, higher meat consumption is having a multiplier impact on grain demand as animals are quite inefficient converters of grain. Impacting the listed agricultural equities is ongoing M&A in the sector, as unique and high-quality assets are being consolidated.

“Most recently we saw activity in the Australian grain-handling industry with ADM bidding for GrainCorp, and in the US pork production sector, Shuanghui International bidding for Smithfield Foods. The sector is also growing, with numerous IPOs and capital raisings taking place in the past 12 months.”

Mr Robbins adds that M&A activity has also been seen in Brazil and Norway, highlighting the fact that industry players value these businesses higher than the market does. This is because both the input cost for the grain to feed the chickens and the price you sell the end product for can fluctuate widely.

“So it is difficult to predict what earnings will be in a quarter or any given year, so while the long-term trends are very positive because the short-term earnings are very unpredictable, the stockmarket doesn’t like that and so tends to value them quite lowly.”

But while changing food habits is one trend, food supply in general and the effect of freak weather remains a factor in the sector, with crops one of the most popular investments.

Mr Robbins notes the ‘blue-chip’ option in this area is Monsanto, which develops genetically modified seeds to increase crop yield.

“The only problem is we look at stocks for growth, quality and value, and it has got loads of growth and quality but it always looks very expensive, so we haven’t managed to buy that yet.”

Instead, as a cheaper way to get exposure he highlights Bayer, a German pharmaceutical company with a division focused on crop sciences that has been growing very quickly.

Mr Robbins adds: “Last year was very poor in terms of the harvest, particularly in America as they had a huge drought and a lot of corn was ruined. So currently corn inventories globally are very low. It will take several years of good harvests to rebuild those inventory levels… so we do like corn and any exposure is positive.”

Ms Macpherson adds that from a valuation perspective, it has been a volatile 12 months for the sector, but one that has created opportunities.

“A significant drought in the US saw soft commodity prices like corn, wheat and soy skyrocketing in the middle of 2012, only to sell off towards the end of the year and into 2013 on expectations that both South America and the US would harvest large crops.”

However, Desmond Cheung, co-manager of the BGF World Agriculture fund, warns that investors can get very fixated on crop price developments when a lot of sentiment is already factored in improved supply and lower prices.

“Investors should not really be taking the view that the market does not understand the supply improvement. In the past two to three years we feel people look at crop prices as a gauge on whether or not this sector is attractive, but it actually misses out a big part of the investment universe.

“We think there is a lot of exciting medium-term development, especially in downstream and midstream firms that would offset some of those firms investors would have in the upstream sectors.”

When looking at agriculture, it’s clear there are opportunities globally and with increased M&A action, investors need to take a look at the wider picture instead of only focusing on crop prices.

Nyree Stewart is deputy features editor at Investment Adviser