Farmers have long complained about the instability of the prices paid for their cashew nut crops - as it fluctuates from season to season, he says.

BBC: Tanzania riots over cashew nut payments

It specializes in so-called nonrow agricultural chemicals--herbicides and pesticides for fruit and nut trees instead of crops like corn grown in rows.

FORBES: Chemical Balance

Thousands of small-scale cashew nut farmers in Tanzania - who usually begin to harvest in October - sell their crops to co-operative societies at an agreed price.

BBC: Tanzania riots over cashew nut payments