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Farming of contaminated arable land almost the size of Belgium has been halted and the land will be rehabilitated to ensure food security, a senior official said on Monday.

A soil survey by the Ministry of Environmental Protection found that pollution affects about 3.33 million hectares, Wang Shiyuan, vice-minister of land and resources, said.

"This finding is similar to the geographical environmental study by the Ministry of Land and Resources," Wang added.

Arable land in China totaled 135.4 million hectares at the end of last year, 15 million hectares more than the bottom line set by the government to ensure food security, Wang said at a news conference, citing the results of the second national land survey released on Monday.

However, the amount of stable cultivated land will drop to 120 million hectares, as some farmland will be converted to forests, grasslands and wetlands, while pollution will leave some land unusable, Wang said.

A nationwide survey on soil pollution was carried out between 2006 and 2010, led by the Ministry of Environmental Protection and the Ministry of Land and Resources, but the results were never made public.

Bai Chengshou, deputy head of the nature and ecology conservation department at the environmental protection ministry, said results will be published in future, with more data included.

Wang said the swaths of polluted farmland are concentrated in developed eastern and central regions and in the northeastern industrial belt.

Answering a China Daily question on whether the tainted land is still being farmed, Wang said no further planting will be allowed on it, as food safety is a top concern for governments at various levels.

Wang said he does not think there are any efficient and quick solutions to soil pollution, as the popular method of using plants to trap heavy metals in the soil usually takes more than a decade to work.

"One of the most practicable plans may be to replace crops with other plants such as trees," said Wang, head of the Institute of Environmental Engineering Technology at the Chinese Research Academy of Environmental Sciences.

（中國日報網英語點津 Helen 編輯）

About the broadcaster:

Anne Ruisi is an editor at China Daily online with more than 30 years of experience as a newspaper editor and reporter. She has worked at newspapers in the U.S., including The Birmingham News in Alabama and City Newspaper of Rochester, N.Y.