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China has planted about 300 new strains of saltwater-tolerant rice on 670 hectares of experimental alkali fields in search of resilient, high-yield varieties that can grow on previously unproductive land.

China had more than 230 million people aged 60 or above at the end of 2016, 16.7 percent of the total population, according to the Ministry of Civil Affairs. The country's elderly will account for about one-quarter of the population by 2030.

China has ample grain reserves and is fully capable of guaranteeing the country's supply of grains and staple agricultural produce, the participants said.

China has been loosening control over the new energy car sector. The country has limits on the number of joint ventures a foreign carmaker can have, but in June authorities added a footnote to the rule saying that partnerships dedicated to new energy cars are an exception.

China expresses strong dissatisfaction and firm opposition, he said.