The company also permanently laid off seven of its Yazoo City nitrogen plant workers this week.
Mississippi Chemical, which filed for Chapter Eleven bankruptcy protection in May, has set no date for emerging from bankruptcy.
To raise badly needed operating cash, the company recently signed a contract to sell its ammonia plant in the Republic of Trinidad and Tobago to Koch Nitrogen for $127 million.
Like the rest of the fertilizer industry, Mississippi Chemical has been squeezed by steep natural gas prices, weak agricultural demand and price competition from overseas producers.
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