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(2) If properly looked after it is a very efficient and 

 economical method of making silage. 



(3) The stack may be built at any convenient place. 



(4) The pressure can be added or taken off with the 

 least labour. 



(5) They are easily built and are most handy to 

 feed from. 



The disadvantages : 



(1) The decay round sides of stack is sometimes 



considerable. 



(2) There is greater loss in weight by evaporation 

 than there is in built silos. 



(3) Unless well thatched liable to harm from rain. 



(4) Open to vermin attack. 



(5) In heavy gales apt to be blown over. 



