As water tables have fallen and irrigation wells have gone dry, China's wheat crop, the world's largest, has declined by 8% since it peaked at 123 million tons in 1997.
Green sand casting casting clay weight from a few kilograms until decades kilograms, machine tool lathe bed and clay dry type of casting production can be weighed dozens of tons.
粘土湿型砂铸造的铸件重量可从几公斤直到几十公斤，机床床身而粘土干型生产的铸件可重达几十吨。
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Industrial Co., Ltd. Yucheng, Shandong was established in 2002, is China's key enterprises function sugar city, with an annual output of 3000 tons (dry method) modified starch production line.