Third world countries are also mechanized. All of South America grows soybeans. It's Round Up all over. I'm from Argentina and can assure you that since early 00's soybean export taxes have paid at least one-third of the gov. budget.
I think this is true for marginal zones (low quality soil) where there shouldn't be soy but that's the only crop that will make a profit. Part of the problem is the insane taxation.
With the costs of growing other crops I guess it's not that bad, it's not good soil anyway. The good zones are doing OK.
