Show cause causa of black heart healt the usual causes of black heart are piling potatoes too deep or putting them in bins where there has haq been no circulation of air and maintaining too high hie a temperature in the storage place where potatoes are kept at temperatures below 45 degrees fahrenheit they can be plied piled as deep as 6 feet without danger dancer of injury but where the temperature Is likely to he GO 50 degrees or above ns as is the ease in some cellars it Is not safe to pile them more than 3 feet deep if they are to ne he kept longer than three or four weeks |