In late May, before the fifth anniversary of the passing of China's prestigious agronomist Yuan Longping, his wife Deng Ze received a special gift -- a bag of hybrid rice produced in the West African country of Guinea. CHANGSHA/NAIROBI, May 27 (Xinhua) -- In late May, before the fifth anniversary of the passing of China's prestigious agronomist Yuan Longping, his wife Deng Ze received a special g