It's really hard to value agriculture companies based on assets since most of the assets are land, and even harder when they are not operating in the same country.
Trigon Agri and Black earth Farming had good investment idea, but it hasn't been succesfull at all, and wont be either (trading at PE287 and PE-4,93, compared with siaf PE1). And they are investing in Russia, I wouldn't touch any company investing in Russia with a stick. And why would you like to compare Feelgood with SIAF? Feelgood is a health company!