that's a source of concern for rattapat srichanklad. leads an initiative that promotes sustainable agriculture in chiang mai. rattapat: thailand is one of the biggest meat exporters in the world. of course, that pleases the government. that's why it supports the cultivation of corn used as livestock fodder. but it would be better to produce food for humans. florian: for farmers, cultivating this kind of corn can seem like an attractive option. high demand for meat keeps feed prices stable. as a result, many farmers have come to rely on it for their income. but growing the same crop in the same place each year sucks nutrients out of the soil. farmer somboon has been growing corn for animal feed for over a decade. but he'd actually prefer to grow other crops. in recent times, his yield has fallen. the plants rely on chemical fertilizer, but that's pricey. so much so, he's run into debt. somboon: growing corn is becoming more problematic. up to now i haven't had an alternative. i haven't been trained up to do anything else and i need to ta