Observatories: guangdong is one of the main rice-producing regions of the south of the country, growing around 28 million acres a year, almost 30 per cent of which are low-yielding fields, with the acre production hovering for a long time at around 300 kg. New changes are taking place here with the application of new technologies for the landing of saline-resistant varieties, carbon nitrogen balancing。This is the gate to the guangdong sea,