Rents could fall even more dramatically in 2017 if commodity prices do not rebound.
Timberland funds attracted $600 million less by volume than in 2014, and agri investments attracted $3.9 billion in 2014 and 2015, according to the natural resources investment survey.
Brazil had a record harvest, and Australian production also went up, but the US market will be faced by new challenges as demand for organic sugar increases.
The real estate company paints a confident picture for further Australian farmland and cattle station sales in 2016.
Ethanol's lower-than-petrol pricing meant the amount put into fuel went up in 2015.
The industry-funded study warns banning GMO use would cause food price hikes and environmental harm.
The German and Spanish pork industries are primed for expansion, while the Netherlands' competitive edge is being challenged by higher input costs.
Larger dairy operations are likely to survive price downturns and save on operating costs according to a new Rabobank report.
Record exports and increased imports in agricultural goods are expected to reduce the US agri trade surplus to its lowest level in a decade.
Investors looking to reap rewards from non-GMO price premiums may face additional costs from exposure to genetically engineered material.